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SIK GUIDEYour Guide to the SparkFun Inventor’s Kit for Arduino
AREF GN
D 13 12 11 10˜9
8
6 5
7
4 3 2 1 0
DIGITAL (PWM )
RESET
LTX RX
SIK GUIDEYour Guide to the SparkFun Inventor’s Kit for Arduino
AREF GN
D 13 12 11 10˜9
8
6 5
7
4 3 2 1 0
DIGITAL (PWM )
RESET
LTX RX
The SparkFun Inventor's Guide is your map for navigating the waters of beginning embedded electronics. This booklet contains all the information you will need to explore the 14 circuits of the SparkFun Inventor's Kit for Arduino. At the center of this manual is one core philosophy - that anyone can (and should) play around with electronics. When you're done with this guide, you'll have the know-how to start creating your own projects and experiments. Now enough talking - let's get inventing!
sparkfun.com
Welcome to the SparkFun Inventor’s Guide
Table of Contents
What is an Arduino? 1
Download Arduino Software (IDE) 3
Install Drivers for Arduino 4
Identify your Arduino 7
Download “SIK Guide Code” 8
The World Runs on Circuits 9
Inventory of Parts 11
13
15
17
24
28
32
36
40
44
48
52
Section 2: Getting Started with Circuits
Section 1: Getting Started with Arduino
Arduino Uno
Breadboard
Circuit #1 - Your First Circuit: Blinking a LED
Circuit #3 - RGB LED
Circuit #4 - Multiple LEDs
Circuit #5 - Push Buttons
Circuit #6 - Photo Resistor
Circuit #7 - Temperature Sensor
Circuit #8 - A Single Servo
Circuit #9 - Flex Sensor
56Circuit #10 - Soft Potentiometer
60Circuit #11 - Piezo Element
64Circuit #12 - Spinning a Motor
68Circuit #13 - Relay
72Circuit #14 - Shift Register
Circuit #2 - Potentiometer
Arduino is an open-source physical computing platform designed to make experimenting with electronics more fun and intuitive. Arduino has its own unique, simplified programming language, a vast support network, and thousands of potential uses, making it the perfect platform for both beginner and advanced DIY enthusiasts.
arduino.cc
The Arduino Revolution
What is an Arduino?
The friendly blue board in your hand (or on your desk) is the Arduino. In some ways you could think of Arduino as the child of traditional desktop and laptop computers. At its roots, the Arduino is essentially a small portable computer. It is capable of taking inputs (such as the push of a button or a reading from a light sensor) and interpreting that information to control various outputs (like a blinking LED light or an electric motor).
That's where the term "physical computing" is born - an Arduino is capable of taking the world of electronics and relating it to the physical world in a real and tangible way. Trust us - this will all make more sense soon.
A Computer for the Physical World
// Arduino UNO SMD R3
The Arduino Uno is one of several development boards based on the ATmega328. We like it mainly because of its extensive support network and its versatility. It has 14 digital input/output pins (6 of which can be PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. Don’t worry, you’ll learn about all these later.
cb
a
d
e
f
g
h
c
b
a
f
e
d
h
g
Power-Lacing High Tops
Old Toy Email Notifer
Bug Zapper Counter
Re-Programmed Traffic Light
Auto-Plant Watering
Camera Time-lapse operation
Quadcopter
Auto-Coffee Maker
In order to get your Arduino up and running, you'll need to download some software first from www.arduino.cc (it's free!). This software, known as the Arduino IDE, will allow you to program the Arduino to do exactly what you want. It’s like a word processor for writing programs. With an internet-capable computer, open up your favorite browser and type in the following URL into the address bar:
Access the Internet
Download the Arduino IDE (Integrated Development Environment)
user
•••••••••
Windows
Mac OS X
Linux: 32 bit, 64 bit
N
W
S
E
NW
SW
SE
NE
arduino.cc/en/Main/Software < case sensitive >
Choose the appropriate Operating System installation package for your computer.
Download Click on the “ + ” sign next to your appropriate computer operating system.
Windows
Mac OS X
source
Linux: 32 bit, 64 bit
1
// Connect your Arduino Uno to your ComputerUse the USB cable provided in the SIK kit to connect the Arduino to one of your computer’s USB inputs.
// Install Drivers
Depending on your computer’s operating system, you will need to follow specific instructions. Please consult the URLs below for specific instructions on how to install the drivers onto your Arduino Uno.
* You will need to scroll to the section labeled “Install the drivers”.
23
Linux: 32 bit / 64 bit, Installation ProcessGo to the web address below to access the instructions for installations on a Linux-based computer.
http://www.arduino.cc/playground/Learning/Linux
Macintosh OS X Installation ProcessMacs do not require you to install drivers. Enter the following URL if you have questions. Otherwise proceed to next page. http://arduino.cc/en/Guide/MacOSX
Windows Installation ProcessGo to the web address below to access the instructions for installations on a Windows-based computer.
http://arduino.cc/en/Guide/Windows
1 2 3 5 6
7
8
9
4
Open the Arduino IDE software on your computer. Poke around and get to know the interface. We aren’t going to code right away, this is just an introduction. �e step is to set your IDE to identify your Arduino Uno.
// Open the Arduino IDE:
// The three most important commands for this guide are seen below:
GUI (Graphical User Interface)
Verify: Compiles and approves your code. It will catch errors in syntax (like missing semi-colons or parenthesis). // See Diagram Below1
Upload: Sends your code to the Arduino board. When you click it, you should see the lights on your board blink rapidly. // See Diagram Below2
New: This buttons opens up a new code window tab.3
Open: This button will let you open up an existing sketch. // See Diagram Below4
Save: This saves the currently active sketch.5
Serial Monitor: This will open a window that displays any serial information your Arduino is transmitting. It is very useful for debugging.6
Code Area: This is the area where you compose the code for your sketch. 8
Message Area: This is where the IDE tells you if there were any errors in your code.9
Sketch Name: This shows the name of the sketch you are currently working on.7
Verify
Upload
Open
File Edit Sketch Tools Help
Auto FormatArchive SketchFix Encoding & ReloadSerial Monitor
Arduino UnoArduino Duemilanove w/ ATmega328]Arduino Diecimila or Duemilanove w/ ATmega168Arduino Nano w/ ATmega328Arduino Nano w/ ATmega168Arduino Mega 2560 or Mega ADKArduino Mega (ATmega1280)Arduino Mini Arduino Mini w/ATmega168Arduino EthernetArduino FioArduino BT w/ ATmega328Arduino BT w/ATmega168LilyPad Arduino w/ ATmega328LilyPad Arduino w/ ATmega168Arduino Pro or Pro Mini (5V, 16 MHz) w/ATmega328Arduino Pro or Pro Mini (5V, 16 MHz) w/ATmega168Arduino Pro or Pro Mini (3.3V, 8 MHz) w/ATmega328Arduino Pro or Pro Mini (3.3V, 8 MHz) w/ATmega168Arduino NG or older w/ ATmega168Arduino NG or older w/ ATmega8
ProgrammerBurn Bootloader
BoardSerial Port
// Select your board: Arduino Uno
Select the serial device of the Arduino board from the Tools | Serial Port menu. This is likely to be
com3 or higher (COM1 and COM2 are usually reserved for hardware serial ports). To find out, you can disconnect your Arduino board and re-open the menu; the entry that disappears should be the Arduino board. Reconnect the board and select that serial port.
Select the serial device of the Arduino board from the Tools > Serial Port menu. On the Mac, this should be something with /dev/tty.usbmodem (for the Uno or Mega 2560) or /dev/tty.usbserial (for older boards) in it.
http://www.arduino.cc/playground/Learning/Linux
Tools Help
Auto FormatArchive SketchFix Encoding & ReloadSerial Monitor
com 1com 12
ProgrammerBurn Bootloader
BoardSerial Port
Tools Help
Auto FormatArchive SketchFix Encoding & ReloadSerial Monitor
/dev/tty.usbmodem262471 /dev/cu.usbmodem262471 /dev/tty.Bluetooth-Modem /dev/cu.Bluetooth-Modem /dev/tty.FireFly-7256-SPP /dev/cu.FireFly-7256-SPP /dev/tty.tiPhone-WirelessiAP-1 /dev/cu.tiPhone-WirelessiAP-1 /dev/tty.Bluetooth-PDA-Sync /dev/cu.Bluetooth-PDA-Sync
ProgrammerBurn Bootloader
BoardSerial Port
// S
elec
t you
r Ser
ial D
evic
e
4W
WW
.ARD
UINO
.CC
RESET
A5ANALOG IN
WW
W.A
RDUI
NO.C
C
RESET
A5ANALOG IN
Type in the following URL to download the code:
Download Arduino Code (For use with the circuits in this guide)
sparkfun.com/sikcode
5
Unzip the file “SIK Guide Code”. It should be located in your browser’s “Downloads” folder. Right click the zipped folder and choose “unzip”.
Copy the “SIK Guide Code” folder into Arduino’s folder named “examples”.
Copy the “SIK Guide Code” folder into Arduino’s folder named “examples”.
Unzip the file “SIK Guide Code”. It should be loacted in your browser’s “Downloads” folder. Right click the zipped folder and choose “unzip”.
Find “Arduino” in your applications folder. Right click(ctrl + click) on “Arduino”. Select “Show Package Contents”.
http://www.arduino.cc/playground/Learning/Linux
// C
opy
“SIK
Gui
de C
ode”
into
“Ex
ampl
es”
libra
ry in
Ard
uino
fold
er
ProgramsStart arduino examples
Contents
Resources
Java
examplesArduino
Move to Trash
Open
Show Package Contents
Everywhere you look, you'll find circuits. The cell phone in your pocket, the computer that controls your car's emissions system, your video game console - all these things are chock full of circuits. In this guide, you'll experiment with some simple circuits and learn the gist of the world of embedded electronics.
The World Runs on Circuits:
Getting Started with Circuits
A circuit is basically an electronics loop with a starting point and an ending point - with any number of compo-nents in between. Circuits can include resistors, diodes, inductors, sensors of all sizes and shapes, motors, and any other handful of hundreds of thousands of components.
Circuits are usually divided into three categories - analog circuits, digital circuits, or mixed-signal circuits. In this guide, you will explore all three sets of circuits.
What is an Electrical Circuit?
// Simple and Complex Circuits
In this guide, you will be primarily exploring simple circuits - but that doesn't mean you can't do amazing things with simple tools! When you've finished the SIK, your knowledge of circuits will enable you to explore amazing projects and unleash the power of you imagination.
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Inventory of Parts
* ACTUAL SIZE
(1N4148)Diode
x2
x1
Piezo Element
Various ColorsJumper Wire
x30
Push Button
x2x1
DC Motor
x1
DC Motor
x1
Potentiometer
(Light Emitting Diode)
x10 x10 x1
LED (5mm) +-
330Ω Resistor
x25 * ACTUAL SIZE
10KΩ Resistor
x25 * ACTUAL SIZE
(TMP36)
x1
Temp. Sensor
FRONT
BACK
(P2N2222AG)
x2
Transistor
P2N2
222A
A18
FRONT
BACK
x1
Photo Resistor
Standard Solderless Breadboard
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UNO - PTH VersionArduino Board
AREFGND
13121110
98
65
7
43210
3.3V5V
RESET
GNDGNDVIN
DIGITAL (PW
M )
WWW.ARDUINO.CC
POW
ER
RESET
RESET-EN
RX TX L
A1 A2
A0
A3A4A5
MADE
IN ITA
LY
ANALO
G IN
TXRX
Standard Solderless Breadboard
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UNO - SMD VersionArduino BoardFlex Sensor
x1
Soft Potentiometer
x1
Servo
x1
Relay
x1
x1
x1
(IC)Integrated Circuit
x1
// Pins Diagram
Arduino Uno
Power In (Barrel Jack) - Can be used with either a 9V or 12V wall-wart or battery.1
Power In (USB Port) - Provides power and communicates with your board when plugged into your computer via USB.2
LED (RX: Receiving) - This shows when the Arduino is receiving data (such as when being programmed).3
LED (TX: Transmitting) - This shows when your Arduino is transmitting data (such as when running a program). 4
LED (Pin 13: Troubleshooting) - This LED is incorporated into your sketch to show if your program is running properly.5
Pins (ARef, Ground, Digital, Rx, Tx) - These various pins can be used for inputs, outputs, power, and ground. // See Diagram Below 6
LED (Indicates Arduino is ON) - This is a simple power indicator LED.7
Reset Button - This is a way to manually reset your Arduino, which makes your code restart.8
Pins (Analog In, Power In, Ground, Power Out, Reset) - These various pins can be used for inputs, outputs, power, and ground. // See Diagram Below10
ICSP Pins (Uploading Code without Bootloader) - This is for "In-Circuit Serial Programming," used if you want to bypass the boot loader.9
Power Out
Reset
IOREF
RFU
Power Out
Ground
Ground
Power In
Analog
Analog
Analog
Analog
Analog
Analog
Ground
ARef
SDA
SCL
Digital
Digital
Digital
Digital
Digital
Digital
Digital
Digital
Digital
Digital
Digital
Digital
TX - Out
RX - In
10
6
= PWM/Analog out compatible (i.e. )
The header pins are one of the most important parts for putting our example circuits together. Take a moment and locate the input/output ports of your Arduino Uno.
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This line divides the board in half, restricting electricity to one half or the other.
1
2
Power:
Each + sign runs power anywhere in the vertical column.
Ground:
Each - sign runs to ground anywhere in the vertical column.
Horizontal Rows:
Each of these rows numbered 1-30 are comprised of five horizontal sockets. Components placed in the same row will be connected in a circuit when power is running.
Vertical Connection (+ Power and - Ground // See Diagram Below)1
Horizontal Connection (a-e & f-j // See Diagram Below)2
How’s it all connected?
View of the inside
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Breadboard
Above the breadboard
CONNECTED!
LED
Making a Connection:
Inside the breadboard
CIRCUIT #1 - Your First Circuit
5V Current Your Arduino runs on �ve volts. �is is the power that will be supplied from your computer via USB and will be the driving force behind any components you use in your circuits. By plugging your Arduino board into your computer, you are supplying it with just the right voltage it needs to thrive! 5V can’t hurt you, so don’t be afraid to touch anything in your citcuit.
Peel sticker off back of Breadboard and stick into place.
How It Works:
ASSEMBLE WRITE UPLOAD
Make sure the text on the Arduino and Breadboard are facing up so you can read them.
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Screw the Arduino board down and into place.
Connect the USB cable.
PART
S: LED
1X
Wire
3X
330ΩResistor
1X This section lists the parts you will need to complete the circuit.
Circuit 2
LEDs (light-emitting diodes) are small, powerful lights that are used in many di�erent applications. To start o� the SIK, we will work on blinking an LED. �at's right - it's as simple as turning a light on and o�. It might not seem like much, but establishing this important baseline will give you a solid foundation as we work toward more complex experiments.
Blinking a LED 1
Each Circuit begins with a brief description of the what you are putting together and the expected result.
This is a schematic of your circuit.
Arduino
LED(Light Emitting Diode)
GND(ground) (-)
Resistor(Orange-Orange-Brown)
(330ohm)
This is an illustration of how the completed circuit should look. It is not necessary to use the black holder for the Arduino and Breadboard, but we recommend it for the first time inventor!
Components like Resistors need to have their legs bent into 90° angles in order to correctly fit the breadboard sockets.
Pin 13
Circ
uit 1
: Blin
king
a L
ED
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
LED:
Mak
e su
re th
e sh
ort l
eg,
mar
ked
with
flat
side
, goe
s int
o th
e ne
gativ
e po
sitio
n (-)
. 33
0Ω R
esis
tor:
The
colo
r ban
ding
sh
ould
read
ora
nge-
oran
ge-
brow
n-go
ld. T
he co
mpo
nent
legs
ca
n go
in e
ither
hol
e.
Jum
per W
ire: A
ll ju
mpe
r wire
s w
ork
the
sam
e. T
hey
are
used
to
conn
ect t
wo
poin
ts to
geth
er. T
his
guid
e w
ill sh
ow th
e w
ires w
ith d
iffer
ent
colo
red
insu
latio
ns fo
r cla
rity,
but
usi
ng
diffe
rent
com
bina
tions
of c
olor
s is
com
plet
ely
acce
ptab
le.
Fla
t E
dg
e
Sho
rt L
eg
Com
pone
nt:
Imag
e Re
fere
nce:
LED
(5m
m)
+-
+-
c2c3
Jum
per W
irePi
n 13
e2
330Ω
Res
isto
ra3
GN
Da3
Jum
per W
ireG
ND
Jum
per W
ire5V5V
+“5
V” o
n th
e Ar
duin
o co
nnec
ts to
the
row
mar
ked
“+”
on th
e Br
eadb
oard
.
“Pin
13”
on
the
Ardu
ino
conn
ects
to so
cket
“e2”
on
the
Brea
dboa
rd.
“GN
D”
on th
e Ar
duin
o sh
ould
be
conn
ecte
d to
the
row
mar
ked
“-”
on th
e Br
eadb
oard
.
Com
pone
nts l
ike
LEDs
are
inse
rted
into
the
Brea
dboa
rd so
cket
s c2(
long
leg)
c3(
shor
t leg
).
Resis
tors
are
pla
ced
in B
read
boar
d so
cket
s onl
y. Th
e “-
” sym
bol r
epre
sent
s any
sock
et in
its v
ertic
al co
lum
n.
Brea
dboa
rd: T
he w
hite
bac
kgro
und
repr
esen
ts a
conn
ectio
n to
a
brea
dboa
rd so
cket
.
Ardu
ino:
The
blu
e ba
ckgr
ound
re
pres
ents
a co
nnec
tion
to o
ne o
f th
e Ar
duin
o he
ader
pin
s.
Open Up the Arduino IDE software on your computer. Coding in the Arduino language will control your circuit. Open the code for Circuit 1 by accessing the “SIK Guide Code” you downloaded and placed into your “Example” folder earlier.
Open Your First Sketch:
File Edit Sketch Tools Help
1.Basics2.Digital3.Analog4.Communication5.Control6.Sensors7.Displays8.StringsArduinoISPSIK Guide Code
EEPROMEthernetFirmataLiquid CrystalSDServoSoftwareSerialSPIStepperWire
Page SetupPrint
NewOpen...SketchbookExamplesCloseSaveSave As...UploadUpload Using Progammer
Circuit #1Circuit #2Circuit #3Circuit #4Circuit #5Circuit #6Circuit #7Circuit #8Circuit #9Circuit #10Circuit #11Circuit #12Circuit #13Circuit #14
Circuit #1
/* Blink
Turns on an LED on for one second, then off for one second, repeatedly. This example code is in the public domain.
*/
void setup() { // initialize the digital pin as an output. // Pin 13 has an LED connected on most Arduino boards: pinMode(13, OUTPUT); }
void loop() { digitalWrite(13, HIGH); // set the LED on delay(1000); // wait for a second digitalWrite(13, LOW); // set the LED off delay(1000); // wait for a second}
// Circuit #1
Verify
Upload
// The result of a completed circuit with correct code after verified and uploaded.
�is compiles your code. �e IDE changes it from text into instructions the computer can understand.
�is sends the instructions via the USB cable to the computer chip on the Arduino board. �e Arduino will then begin running your code automatically.
Circuit 2 Arduino Code:1
Troubleshooting:
LED Not Lighting Up?LEDs will only work in one direction. Try taking it out and twisting it 180 degrees (no need to worry, installing it backwards does no permanent harm).
Program Not Uploading �is happens sometimes, the most likely cause is a confused serial port, you can change this in tools>serial port>
Still No Success?A broken circuit is no fun, send us an e-mail and we will get back to you as soon as we can: techsupport@sparkfun.com
You should see your LED blink on and o�. If it isn't, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board or see the troubleshooting tips below.
Before you can use one of the Arduino's pins, you need to tell the Arduino whether it is an INPUT or OUTPUT. We use a built-in "function" called pinMode() to do this.
When you're using a pin as an OUTPUT, you can command it to be HIGH (output 5 Volts), or LOW (output 0 Volts).
digitalWrite(13, HIGH);
pinMode(13, OUTPUT);
Code to Note:
Real World Application:
Almost all modern �at screen televisions and monitors have LED indicator lights to show they are on or o�.
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 1
What you Should See:
This is where you will find the Arduino code for each circuit.
Remember to Verify and Upload your code.
See if your circuit is complete and working in this section.
Begin to understand how the Arduino code works. See below.
This is a section dedicated to the most common mistakes made while assembling the circuit.
Here you will find examples of the circuit you just completed in the real world. Many of the theories in these circuits are used in things you use everyday!
Pin 13
Pin AØ
Circuit 2PA
RTS: Wire
19X
CIRCUIT #5
IC
1X
330ΩResistor
8X
LED
8X
Circuit 2
In this circuit you’ll work with a potentiometer. A potentiometer is also known as a variable resistor. When it’s connected with 5 volts across its two outer pins, the middle pin outputs a voltage between 0 and 5, depending on the position of the knob on the potentiometer. In this circuit, you’ll learn how to use a potentiometer to control the brightness of an LED.
Potentiometer
PART
S: Wire
6X
CIRCUIT #2 2
LED
1X
330ΩResistor
1X
Arduino PotentiometerArduino
+5 Volts
LED
resistor(Orange-Orange-Brown)
GND(ground) (-)
(330ohm)
Potentiometer
1X
p.10p.24
Circ
uit 2
: Pot
entio
met
er
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Com
pone
nt:
Imag
e Re
fere
nce:
Pote
ntio
met
er
e6Ju
mpe
r Wire
e8Ju
mpe
r Wire
Jum
per W
ireG
ND
Jum
per W
ire5V
Pin
13j2
0
Jum
per W
ireG
ND
Jum
per W
ire5V5V
+
+-
+-
h20
h21
LED
(5m
m)
330Ω
Res
isto
ri2
1+
Jum
per W
ireA0
e7
+
a6 a7 a8If
you
look
clos
ely at
you
r Ard
uino
, you
'll se
e som
e pin
s lab
eled
"DIG
ITAL
", an
d so
me l
abele
d "A
NAL
OG
". W
hat's
the d
i�er
ence
?
Man
y of
the d
evice
s you
'll in
terfa
ce to
, suc
h as
LED
s and
pus
hbut
tons
, hav
e on
ly tw
o po
ssibl
e sta
tes:
on an
d o�
, or a
s the
y're
kno
wn
to th
e Ard
uino
, "H
IGH
" (5
Vol
ts) an
d "L
OW
" (0
Vol
ts). �
e dig
ital p
ins o
n an
Ard
uino
are
grea
t at g
ettin
g th
ese s
igna
ls to
and
from
the o
utsid
e wor
ld, a
nd ca
n ev
en d
o tri
cks l
ike s
imul
ated
dim
min
g (b
y bl
inki
ng o
n an
d o�
reall
y fa
st), a
nd se
rial
com
mun
icatio
ns (t
rans
ferr
ing
data
to an
othe
r dev
ice b
y en
codi
ng it
as p
atte
rns
of H
IGH
and
LOW
).
But t
here
are a
lso a
lot o
f thi
ngs o
ut th
ere t
hat a
ren'
t jus
t "on
" or "
o�".
Tem
pera
ture
leve
ls, co
ntro
l kno
bs, e
tc. a
ll ha
ve a
cont
inuo
us ra
nge o
f valu
es
betw
een
HIG
H an
d LO
W. F
or th
ese s
ituat
ions
, the
Ard
uino
o�e
rs six
analo
g in
puts
that
tran
slate
an in
put v
olta
ge in
to a
num
ber t
hat r
ange
s fro
m 0
(0 V
olts)
to
102
3 (5
Vol
ts). �
e ana
log
pins
are p
erfe
ct fo
r mea
surin
g all
thos
e "re
al w
orld
" valu
es, a
nd al
low
you
to in
terfa
ce th
e Ard
uino
to al
l kin
ds o
f thi
ngs.
Digi
tal v
ersu
s An
alog
:
DIGI
TAL
0 vo
lts 0
5 vo
lts
1023
ANAL
OG
HIGH
on 5 vo
lts
LOW
off
0 vo
lts
MP3 players’ volume control is an example of a potentiometer in action.
Circuit 2 Arduino Code:2
Troubleshooting:
Sporadically Working �is is most likely due to a slightly dodgy connection with the potentiometer's pins. �is can usually be conquered by holding the potentiometer down.
Not WorkingMake sure you haven't accidentally connected the potentiometer's wiper to digital pin 2 rather than analog pin 2. (the row of pins beneath the power pins).
Still BackwardYou can try operating the circuit upside down. Sometimes this helps.
You should see the LED blink faster or slower in accordance with your potentiometer. If it isn't working, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board or see the troubleshooting tips below.
A "variable" is a number you've given a name to. You must introduce, or "declare" variables before you use them; here we're declaring a variable called sensorValue, of type "int" (integer). Don't forget that variable names are case-sensitive!
int sensorValue;
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 2
What you Should See:
The Arduino is very very fast, capable of running thousands of lines of code each second. To slow it down so that we can see what it's doing, we'll often insert delays into the code. Delay() counts in milliseconds; there are 1000 ms in one second.
delay(sensorValue);
We use the analogRead() function to read the value on an
analog pin. analogRead() takes one parameter, the analog
pin you want to use ("sensorPin"), and returns a number
("sensorValue") between 0 (0 Volts) and 1023 (5 Volts).
sensorValue = analogRead(sensorPin);
Circuit 2PA
RTS:
p.10
IC
1X
330ΩResistor
8X
LED
8X
You know what’s even more fun than a blinking LED? A colored one. RGB, or red-green-blue, LEDs have three di�erent color-emitting diodes that can be combined to create all sorts of colors. In this circuit, you’ll learn how to use an RGB LED to create unique color combinations. Depending on how bright each diode is, nearly any color is possible!
RGB LED
PART
S:CIRCUIT #3 3
p.28
Potentiometer
1X
TransistorP2N2222AG
1X
Pin 11 Pin 10 Pin 9
red
green
blue
resistor(330ohm)(Orange-Orange-Brown)
GND(ground) (-)
Wire
6X
330ΩResistor
3X
LED
1X
red
commongreen
blue
Circ
uit 3
: RGB
LED
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
* T
he lo
nges
t le
ad is
the
co
mm
on(
gnd
).
Com
pone
nt:
Imag
e Re
fere
nce:
e7e1
15V
330Ω
Res
isto
rg4
e4 e7e1
15V
330Ω
Res
isto
rg6
e6 e7e1
15V
330Ω
Res
isto
rg7
e7
RGB
LED
(5m
m)
Jum
per W
ireG
ND
Jum
per W
ire5V5V
+
Jum
per W
irePi
n 9
h4
Jum
per W
irePi
n 10
h6
Jum
per W
irePi
n 11
h7
e5Ju
mpe
r Wire
We'v
e se
en th
at th
e Ar
duin
o ca
n re
ad a
nalo
g vo
ltage
s (vo
ltage
s bet
wee
n 0
and
5 V
olts)
usin
g th
e an
alog
Rea
d() f
unct
ion.
Is th
ere
a w
ay fo
r the
Ard
uino
to
outp
ut a
nalo
g vo
ltage
s as w
ell?
�e
answ
er is
no.
.. an
d ye
s. �
e Ar
duin
o do
es n
ot h
ave
a tr
ue a
nalo
g vo
ltage
ou
tput
. But
, bec
ause
the
Ardu
ino
is so
fast,
it c
an fa
ke it
usin
g so
met
hing
ca
lled
PW
M ("
Pul
se-W
idth
Mod
ulat
ion"
).
�e
Ardu
ino
is so
fast
that
it c
an b
link
a pi
n on
and
o�
alm
ost 1
000
times
per
se
cond
. PW
M g
oes o
ne st
ep fu
rthe
r by
vary
ing
the
amou
nt o
f tim
e th
at th
e bl
inki
ng p
in sp
ends
HIG
H v
s. th
e tim
e it
spen
ds L
OW
. If i
t spe
nds m
ost o
f its
tim
e H
IGH
, a L
ED c
onne
cted
to th
at p
in w
ill a
ppea
r brig
ht. I
f it s
pend
s m
ost o
f its
time
LOW
, the
LED
will
look
dim
. Bec
ause
the
pin
is bl
inki
ng
muc
h fa
ster t
han
your
eye
can
det
ect,
the
Ardu
ino
crea
tes t
he il
lusio
n of
a
"tru
e" a
nalo
g ou
tput
.
The
shoc
king
trut
h be
hind
ana
logW
rite(
):
90%90
%
50%
50%
0.5
v
2.5
v
4.5
v
LOW
(0 v
olts
)
HIG
H (5
vol
ts)
LOW
(0 v
olts
)
HIG
H (5
vol
ts)
LOW
(0 v
olts
)
HIG
H (5
vol
ts)
10%
10%
a4a5
a6a7
Many electronics such as videogame consoles use RGB LEDs to have the versatility to show di�erent colors in the same area. Often times the di�ent colors represent di�erent states of working condition.
Circuit 2 Arduino Code:3
Troubleshooting:
LED Remains Dark or Shows Incorrect ColorWith the four pins of the LED so close together, it’s sometimes easy to misplace one. Double check each pin is where it should be.
Seeing Red�e red diode within the RGB LED may be a bit brighter than the other two. To make your colors more balanced, use a higher ohm resistor. Or adjust in code.
analogWrite(RED_PIN, redIntensity); to
analogWrite(RED_PIN, redIntensity/3);
You should see your LED turn on, but this time in new, crazy colors! If it isn't, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board or see the troubleshooting tips below.
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 3
What you Should See:
A for() loop is used to step a number across a range, and repeatedly runs code within the brackets {}. Here the variable "x" starts a 0, ends at 767, and increases by one each time ("x++").
for (x = 0; x < 768; x++){}
The Arduino is very very fast, capable of running thousands of lines of code each second. To slow it down so that we can see what it's doing, we'll often insert delays into the code. Delay() counts in milliseconds; there are 1000 ms in one second.
delay(sensorValue);
"If / else" statements are used to make choices in your programs. The
statement within the parenthesis () is evaluated; if it's true, the code within
the first brackets {} will run. If it's not true, the code within the second
brackets {} will run.
if (x <= 255){}else{}
So you have gotten one LED to blink on and o� – fantastic! Now it's time to up the stakes a little bit – by connecting EIGHT LEDS AT ONCE. We'll also give our Arduino a little test by creating various lighting sequences. �is circuit is a great setup to start practicing writing your own programs and getting a feel for the way Arduino works.
Along with controlling the LEDs, you’ll learn about a couple programming tricks that keep your code neat and tidy:
for() loops - used when you want to run a piece of code several times
arrays[ ] - used to make managing variables easier by grouping them together
Multiple LEDsPin 2 Pin 3 Pin 4 Pin 5
GND
LEDLight Emitting Diode
LEDLight Emitting Diode
resistor(330ohm)(Orange-Orange-Brown)
resistor(330ohm)(Orange-Orange-Brown)
Pin 6 Pin 7 Pin 8 Pin 9
GND(ground) (-)
p.32
PART
S: LED
8X
Wire
10X
330ΩResistor
8X
CIRCUIT #4 4Pin 2 Pin 3 Pin 4 Pin 5
Pin 6 Pin 7 Pin 8 Pin 9
Circ
uit 4
: Mul
tiple
LED
s
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Com
pone
nt:
Imag
e Re
fere
nce:
Com
pone
nt:
Imag
e Re
fere
nce:
330Ω
Res
isto
ra1
8G
ND
330Ω
Res
isto
r
330Ω
Res
isto
r
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire5V
Jum
per W
ire
LED
(5m
m)
+-
+-
c2c3
e2Pi
n 2
330Ω
Res
isto
ra1
5G
ND
330Ω
Res
isto
ra1
2G
ND
330Ω
Res
isto
ra9
GN
D
330Ω
Res
isto
ra6
GN
D
330Ω
Res
isto
ra3
GN
Dc2
3c2
4
LED
(5m
m)
+-
+-
c23
c24
LED
(5m
m)
+-
+-
c20
c21
LED
(5m
m)
+-
+-
c17
c18
LED
(5m
m)
+-
+-
c14
c15
LED
(5m
m)
+-
+-
c11
c12
LED
(5m
m)
+-
+-
c8c9
LED
(5m
m)
+-
+-
c5c6
a3G
ND
a24
GN
D
a21
GN
D
Pin
3
Pin
3
e5
GN
D-
Pin
4e8
Pin
5e1
1
Pin
6e1
4
Pin
7e1
7
Pin
8e2
0
Pin
9e2
3 +
Circuit 2 Arduino Code:4
Troubleshooting:
Some LEDs Fail to Light It is easy to insert an LED backwards. Check the LEDs that aren't working and ensure they the right way around.
Operating out of sequenceWith eight wires it's easy to cross a couple. Double check that the �rst LED is plugged into pin 2 and each pin there after.
Starting AfreshIts easy to accidentally misplace a wire without noticing. Pulling everything out and starting with a fresh slate is often easier than trying to track down the problem.
�is is similar to circuit number one, but instead of one LED, you should see all the LEDs blink. If they aren't, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board or see the troubleshooting tips below.
Code to Note:
Real World Application:
Scrolling marquee displays are generally used to spread short segments of important information. �ey are built out of many LEDs.
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 4
What you Should See:
When you have to manage a lot of variables, an "array" is a handy way to group them together. Here we're creating an array of integers, called ledPins, with eight elements.
int ledPins[] = {2,3,4,5,6,7,8,9};
Computers like to do the same things each time they run. But sometimes you want to do things randomly, such as simulating the roll of a dice. The random() function is a great way to do this. See http://arduino.cc/en/Reference/Random for more information.
index = random(8);
You refer to the elements in an array by their position. The first
element is at position 0, the second is at position 1, etc. You refer to
an element using "ledPins[x]" where x is the position. Here we're
making digital pin 2 HIGH, since the array element at position 0 is "2".
digitalWrite(ledPins[0], HIGH);
Circuit 2PA
RTS: Wire
19X
IC
1X
330ΩResistor
8X
LED
8X
Circuit 2
Up until now, we’ve focused solely on outputs. Now we’re going to go to the other end of spectrum and play around with inputs. In this circuit, we’ll be looking at one of the most common and simple inputs – a push button. �e way a push button works with Arduino is that when the button is pushed, the voltage goes LOW. �e Arduino reads this and reacts accordingly. In this circuit, you will also use a pull-up resistor, which helps clean up the voltage and prevents false readings from the button.
Push Buttons
PART
S: Wire
7X
CIRCUIT #5 5Pin 2
+5 Volts
resistor
Pin 3
LED
GND(ground) (-)
resistor(Orange-Orange-Brown)
(330ohm)
Push Button
2X
LED
1X
330ΩResistor
1X
10KΩResistor
2X
Pin 13
Pin 2 Pin 3
p.10p.36
Circ
uit 5
: Pus
h Bu
ttons
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Com
pone
nt:
Imag
e Re
fere
nce:
LED
(5m
m)
+-
+-
h20
h21
Push
But
ton
d4g4
d6g6
Push
But
ton
d9g9
d11
g11
Jum
per W
irePi
n 2
h6
Jum
per W
irePi
n 3
h11
Jum
per W
irePi
n 13
j20
i4Ju
mpe
r Wire
i9Ju
mpe
r Wire
10KΩ
Res
isto
ra1
5i6
+
10KΩ
Res
isto
ri1
1+
330Ω
Res
isto
rj2
1+
One
of t
he th
ings
that
mak
es th
e Ard
uino
so u
sefu
l is t
hat i
t can
mak
e com
plex
dec
ision
s ba
sed
on th
e inp
ut it
's ge
tting
. For
exam
ple,
you
coul
d m
ake a
ther
mos
tat t
hat t
urns
on
a he
ater
if it
get
s too
cold
, a fa
n if
it ge
ts to
o ho
t, w
ater
s you
r plan
ts if
they
get
too
dry,
etc.
In o
rder
to m
ake s
uch
decis
ions
, the
Ard
uino
pro
vide
s a se
t of l
ogic
oper
atio
ns th
at le
t you
bu
ild co
mpl
ex "i
f" st
atem
ents.
�ey
inclu
de:
You
can
com
bine
thes
e fun
ctio
ns to
bui
ld co
mpl
ex if
() sta
tem
ents.
For e
xam
ple:
if ((
mod
e ==
hea
t) &
& ((
tem
pera
ture
< th
resh
old)
|| (o
verr
ide
== tr
ue))
){ di
gita
lWri
te(H
EAT
ER, H
IGH
);} ...
will
turn
on
a hea
ter i
f you
're in
hea
ting
mod
e AN
D th
e tem
pera
ture
is lo
w, O
R if
you
tu
rn o
n a m
anua
l ove
rrid
e. U
sing
thes
e log
ic op
erat
ors,
you
can
prog
ram
you
r Ard
uino
to
mak
e int
ellig
ent d
ecisi
ons a
nd ta
ke co
ntro
l of t
he w
orld
arou
nd it
!
How
to u
se lo
gic
like
a Vu
lcan
:
==
EQUI
VALE
NCE
A ==
B is
true
if A
and
B a
re th
e SA
ME.
!=DI
FFER
ENCE
A !=
B is
true
if A
and
B a
re N
OT T
HE S
AME.
&&
AND
A &
& B
is tr
ue if
BOT
H A
and
B ar
e TR
UE.
||OR
A ||
B is
true
if A
or B
or B
OTH
are
TRUE
.
!NO
T!A
is T
RUE
if A
is F
ALSE
, and
FAL
SE if
A is
TRU
E.
�e buttons we used here are similar to the buttons in most videogame controllers.
Circuit 2 Arduino Code:5
Troubleshooting:
Light Not Turning On �e pushbutton is square, and because of this it is easy to put it in the wrong way. Give it a 90 degree twist and see if it starts working.
Light Not Fading A bit of a silly mistake we constantly made, when you switch from simple on o� to fading, remember to move the LED wire from pin 13 to pin 9.
Underwhelmed No worries, these circuits are all super stripped down to make playing with the components easy, but once you throw them together the sky is the limit.
You should see the LED turn on and o� as you press the button. If it isn't working, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board or see the troubleshooting tips below.
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 5
What You Should See:
The digital pins can be used as inputs as well as outputs. Before you do either, you need to tell the Arduino which direction you're going.
pinMode(button2Pin, INPUT);
Because we've connected the button to GND, it will read LOW when it's being pressed. Here we're using the "equivalence" operator ("==") to see if the button is being pressed.
if (button1State == LOW)
To read a digital input, you use the digitalRead() function. It will return HIGH if there's 5V present at the pin, or LOW if there's 0V present at the pin.
button1State = digitalRead(button1Pin);
Circuit 2
So you’ve already played with a potentiometer, which varies resistance based on the twisting of a knob. In this circuit, you’ll be using a photo resistor, which changes resistance based on how much light the sensor receives. Since the Arduino can’t directly interpret resistance (rather it reads voltage), we use a voltage divider to use our photo resistor. �is voltage divider will output a high voltage when it is getting a lot of light and a low voltage when it is not.
Photo Resistor
PART
S: Wire
6X
CIRCUIT #6 6
LED
1X
330ΩResistor
1X
Photo Resistor
1X
LED
GND(ground) (-)
photoresistor
+5 Volts
resistor(Orange-Orange-Brown)
(330ohm)
resistor(Brown-Black-Orange)
(10k ohm)
10KΩResistor
1X
Pin 9
Pin AØ
p.40
Circ
uit 6
: Ph
oto
Resi
stor
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Com
pone
nt:
Imag
e Re
fere
nce:
Phot
o Re
sist
or
j1Ju
mpe
r Wire
j6Ju
mpe
r Wire
Jum
per W
ireGN
D
Jum
per W
ire5V5V
+
+-
+-
h20
h21
LED
(5m
m)
330Ω
Res
isto
r (se
nsor
)i2
1+
10KΩ
Res
isto
ri1
i5
Jum
per W
ireA0
j5
+
f5f6
Jum
per W
irePi
n 9
j20
Man
y of
the
sens
ors y
ou'll
use
(pot
entio
met
ers,
phot
ores
istor
s, et
c.) a
re
resis
tors
in d
isgui
se. �
eir r
esist
ance
cha
nges
in p
ropo
rtio
n to
wha
teve
r th
ey're
sens
ing
(ligh
t lev
el, e
tc.).
�e
Ardu
ino'
s ana
log
inpu
t pin
s mea
sure
vol
tage
, not
resis
tanc
e. B
ut w
e ca
n ea
sily
use
resis
tive
sens
ors w
ith th
e Ar
duin
o by
incl
udin
g th
em a
s par
t of a
"v
olta
ge d
ivid
er".
A vo
ltage
div
ider
con
sists
of tw
o re
sisto
rs. �
e "t
op"
resis
tor i
s the
sens
or
you'
ll be
usin
g. �
e "b
otto
m"
one
is a
norm
al, �
xed
resis
tor.
Whe
n yo
u co
nnec
t the
top
resis
tor t
o 5
Vol
ts, a
nd th
e bo
ttom
resis
tor t
o gr
ound
, the
m
iddl
e w
ill o
utpu
t a v
olta
ge p
ropo
rtio
nal t
o th
e va
lues
of t
he tw
o re
sisto
rs.
Whe
n on
e of
the
resis
tors
cha
nges
(as i
t will
whe
n yo
ur se
nsor
sens
es th
ings
), th
e ou
tput
vol
tage
will
cha
nge
as w
ell!
Alth
ough
the
sens
or's
resis
tanc
e w
ill v
ary,
the
resis
tive
sens
ors (
�ex
sens
or,li
ght s
enso
r, so
ftpot
, and
trim
pot)
in th
e SI
K a
re a
roun
d 10
K O
hms.
We
usua
lly w
ant t
he �
xed
resis
tor t
o be
clo
se to
this
valu
e, so
usin
g a
10K
re
sisto
r is a
gre
at c
hoic
e fo
r the
�xe
d "b
otto
m"
resis
tor.
Mea
surin
g re
sist
ive
sens
ors:
Pin
3
5 vo
lts
GN
D(g
roun
d) (
-)
Pin
3
A street lamp uses a light sensor to detect when to turn the lights on at night.
Circuit 2 Arduino Code:6
Troubleshooting:
LED Remains Dark�is is a mistake we continue to make time and time again, if only they could make an LED that worked both ways. Pull it up and give it a twist.
It Isn't Responding to Changes in LightGiven that the spacing of the wires on the photo-resistor is not standard, it is easy to misplace it. Double check it’s in the right place.
Still Not Quite WorkingYou may be in a room which is either too bright or dark. Try turning the lights on or o� to see if this helps. Or if you have a �ashlight near by give that a try.
You should see the LED grow brighter or dimmer in accordance with how much light your photoresistor is reading. If it isn't working, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board or see the troubleshooting tips below.
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 6
What You Should See:
When we read an analog signal using analogRead(), it will
be a number from 0 to 1023. But when we want to drive a
PWM pin using analogWrite(), it wants a number from 0 to
255. We can "squeeze" the larger range into the smaller
range using the map() function.
lightLevel = map(lightLevel, 0, 1023, 0, 255);
Because map() could still return numbers outside the "to"
range, we'll also use a function called constrain() that will
"clip" numbers into a range. If the number is outside the
range, it will make it the largest or smallest number. If it is
within the range, it will stay the same.
lightLevel = constrain(lightLevel, 0, 255);
Circuit 2
A temperature sensor is exactly what it sounds like – a sensor used to measure ambient temperature. �is particular sensor has three pins – a positive, a ground, and a signal. For every centigrade degree it reads, it outputs 10 millivolts. In this circuit, you’ll learn how to integrate the temperature sensor with your Arduino, and use the Arduino IDE’s debug window to display the temperature.
Temperature Sensor
CIRCUIT #7 7
p.44
Pin AØ
TMP36(precision
temperaturesensor)
GND(ground) (-)
5 Volts
+5vsignalgnd
PART
S: Wire
5X
Temp. Sensor
1
When you’re building the circuit be careful not to mix up the temperature sensor and the transistor, they’re almost identical.
X
FRONT
BACK
Circ
uit 7
: Tem
pera
ture
Sen
sor
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Tem
pera
ture
Sen
sor
f5f7
f6
Com
pone
nt:
Imag
e Re
fere
nce:
j5Ju
mpe
r Wire
j7Ju
mpe
r Wire
Jum
per W
ireG
ND
Jum
per W
ire5V5V
+
Jum
per W
ireA0
j6
+
�is
circ
uit u
ses t
he A
rdui
no ID
E's s
eria
l mon
itor
. To
open
this,
�rs
t upl
oad
the
prog
ram
then
clic
k th
e bu
tton
whi
ch lo
oks l
ike
a m
agni
fyin
g gl
ass i
n a
squa
re.
Open
ing
your
ser
ial m
onito
r:
1
2
3
Building climate control systems use a temperature sensor to monitor and maintain their settings.
Circuit 2 Arduino Code:7
Troubleshooting:
Nothing Seems to Happen�is program has no outward indication it is working. To see the results you must open the Arduino IDE's serial monitor (instructions on previous page).
Gibberish is Displayed�is happens because the serial monitor is receiving data at a di�erent speed than expected. To �x this, click the pull-down box that reads "*** baud" and change it to "9600 baud".
Temperature Value is Unchanging Try pinching the sensor with your �ngers to heat it up or pressing a bag of ice against it to cool it down.
You should see be able to read the temperature your temperature sensor is detecting on the serial monitor in the Arduino IDE. If it isn't working, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board or see the troubleshoot-ing tips below.
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 7
What You Should See:
voltage: 0.73 deg C: 22.75 deg F: 72.96
voltage: 0.73 deg C: 22.75 deg F: 72.96
voltage: 0.73 deg C: 22.75 deg F: 72.96
voltage: 0.73 deg C: 22.75 deg F: 72.96
voltage: 0.73 deg C: 22.75 deg F: 72.96
Before using the serial monitor, you must call Serial.begin() to initialize it. 9600 is the "baud rate", or communications speed. When two devices are communicating with each other, both must be set to the same speed.
Serial.begin(9600);
Serial.print() will print everything on the same line. Serial.println() will move to the next line. By using both of these commands together, you can create easy-to-read printouts of text and data.
Serial.println(degreesF);
The Serial.print() command is very smart. It can print out almost anything you can throw at it, including variables of all types, quoted text (AKA "strings"), etc.
See http://arduino.cc/en/Serial/Print for more info.
Serial.print(degreesC);
Circuit 2
Servos are ideal for embedded electronics applications because they do one thing very well that spinning motors cannot – they can move to a position accurately. By varying the pulse of voltage a servo receives, you can move a servo to a speci�c position. For example, a pulse of 1.5 milliseconds will move the servo 90 degrees. In this circuit, you’ll learn how to use PWM (pulse width modulation) to control and rotate a servo.
A Single Servo
PART
S: Wire
8X
CIRCUIT #8 8
p.48
Servo
1X
Mini Servo
+5 volts(5V)
GND(ground) (-)
gnd(black)
signal(white)
+5v(red)
Pin 9
Circ
uit 8
: A S
ingl
e Se
rvo
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Com
pone
nt:
Imag
e Re
fere
nce:
Serv
oe5
e7e6
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
e6 e7e5
5V
Jum
per W
irePi
n 9
a7
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
Jum
per W
ireG
ND
b5
+
a6+
Ardu
ino
give
s you
a ve
ry u
sefu
l set
of b
uilt-
in co
mm
ands
for d
oing
bas
ic in
put a
nd o
utpu
t, m
akin
g de
cisio
ns u
sing
logi
c, so
lvin
g m
ath
prob
lems,
etc.
But t
he re
al po
wer
of A
rdui
no is
th
e hug
e com
mun
ity u
sing
it, an
d th
eir w
illin
gnes
s to
shar
e the
ir w
ork.
Libr
aries
are c
ollec
tions
of n
ew co
mm
ands
that
hav
e bee
n pa
ckag
ed to
geth
er to
mak
e it e
asy
to in
clude
them
in y
our s
ketc
hes.
Ardu
ino
com
es w
ith a
hand
ful o
f use
ful l
ibra
ries,
such
as
the s
ervo
libr
ary
used
in th
is ex
ampl
e, th
at ca
n be
use
d to
inte
rface
to m
ore a
dvan
ced
devi
ces (
LCD
disp
lays,
stepp
er m
otor
s, et
hern
et p
orts,
etc.)
See h
ttp:
//ar
duin
o.cc
/en/
Ref
eren
ce/L
ibra
ries
for a
list
of th
e sta
ndar
d lib
rarie
s and
in
form
atio
n on
usin
g th
em.
But a
nyon
e can
crea
te a
libra
ry, a
nd if
you
wan
t to
use a
new
sens
or o
r out
put d
evice
, ch
ance
s are
that
som
eone
out
ther
e has
alre
ady
writ
ten
one t
hat i
nter
face
s tha
t dev
ice to
the
Ardu
ino.
Man
y of
Spa
rkFu
n's p
rodu
cts c
ome w
ith A
rdui
no li
brar
ies, a
nd y
ou ca
n �n
d ev
en
mor
e usin
g G
oogl
e and
the A
rdui
no P
laygr
ound
at h
ttp:
//ar
duin
o.cc
/pla
ygro
und/
. And
w
hen
YOU
get
the A
rdui
no w
orki
ng w
ith a
new
dev
ice, c
onsid
er m
akin
g a l
ibra
ry fo
r it a
nd
shar
ing
it w
ith th
e wor
ld!
To
use a
libr
ary
in a
sket
ch, s
elect
it fr
om S
ketc
h >
Impo
rt L
ibra
ry.
Expa
nd y
our h
oriz
ons
usin
g Li
brar
ies:
File
Edit
Sket
chTo
ols
Hel
p
EEP
RO
MEt
her
net
Firm
ata
Liq
uid
Cry
stal
SD Serv
oSo
ftw
areS
eria
lSP
ISt
epp
erW
ire
Ver
ify
/ C
om
pile
Sho
w S
ketc
h F
old
erA
dd
File
...Im
po
rt L
ibra
ry
Circuit 2 Arduino Code:8
Troubleshooting:
Servo Not Twisting Even with colored wires it is still shockingly easy to plug a servo in backward. �is might be the case.
Still Not WorkingA mistake we made a time or two was simply forgetting to connect the power (red and brown wires) to +5 volts and ground.
Fits and StartsIf the servo begins moving then twitches, and there's a �ashing light on your Arduino board, the power supply you are using is not quite up to the challenge. Using a wall adapter instead of USB should solve this problem.
You should see your servo motor move to various locations at several speeds. If the motor doesn't move, check your connections and make sure you have veri�ed and uploaded the code, or see the troubleshooting tips below.
Code to Note:
Real World Application:
Robotic arms you might see in an assembly line or sci-� movie probably have servos in them.
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 8
What You Should See:
#include is a special "preprocessor" command that inserts a library (or any other file) into your sketch. You can type this command yourself, or choose an installed library from the "sketch / import library" menu.
#include <Servo.h>
Servos don't spin all the way around, but they can be commanded to move to
a specific position. We use the servo library's write() command to move a
servo to a specified number of degrees(0 to 180). Remember that the servo
requires time to move, so give it a short delay() if necessary.
servo1.write(180);
The servo library adds new commands that let you control a servo. To prepare the Arduino to control a servo, you must first create a Servo "object" for each servo (here we've named it "servo1"), and then "attach" it to a digital pin (here we're using pin 9).
Servo servo1;
servo1.attach(9);
PART
S: IC
1X
330ΩResistor
8X
LED
8X
In this circuit, we will use a �ex sensor to measure, well, �ex! A �ex sensor uses carbon on a strip of plastic to act like a variable resistor, but instead of changing the resistance by turning a knob, you change it by �exing (bending) the component. We use a "voltage divider" again to detect this change in resistance. �e sensor bends in one direction and the more it bends, the higher the resistance gets; it has a range from about 10K ohm to 35K ohm. In this circuit we will use the amount of bend of the �ex sensor to control the position of a servo.
Flex Sensor
PART
S:CIRCUIT #9 9
Potentiometer
1X
Servo
1X
Flex Sensor
1X
10KΩResistor
1X
Wire
11X
+5 volts(5V)
+5 volts(5V)
GND(ground) (-)
Mini Servo
resistor
flexsensor
(10K ohm)(Brown-Black-Orange)
p.10p.52
Pin AØ
Pin 9
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Circ
uit 9
: Fle
x Se
nsor
It ha
ppen
s to
ever
yone
- yo
u w
rite a
sket
ch w
hich
succ
essfu
lly co
mpi
les an
d up
load
s, bu
t you
can'
t �gu
re o
ut w
hy it
's no
t doi
ng w
hat y
ou w
ant i
t to.
Lar
ger c
ompu
ters
have
scre
ens,
keyb
oard
s, an
d m
ice th
at y
ou ca
n us
e to
debu
g yo
ur co
de, b
ut ti
ny
com
pute
rs lik
e the
Ard
uino
hav
e no
such
thin
gs.
�e k
ey to
visi
bilit
y in
to a
micr
ocon
trolle
r is o
utpu
t. �
is ca
n be
alm
ost a
nyth
ing,
in
cludi
ng L
EDs a
nd b
uzze
rs, b
ut o
ne o
f the
mos
t use
ful t
ools
is th
e ser
ial m
onito
r. U
sing
Seri
al.p
rint
() an
d pr
intln
(), y
ou ca
n ea
sily
outp
ut h
uman
-read
able
text
and
data
from
the A
rdui
no to
a w
indo
w b
ack
on th
e hos
t com
pute
r. �
is is
grea
t for
you
r sk
etch
's �n
al ou
tput
, but
it's
also
incr
edib
ly u
sefu
l for
deb
uggi
ng.
Debu
ggin
g yo
ur s
ketc
hes
usin
g th
e Se
rial M
onito
r:Co
mpo
nent
:Im
age
Refe
renc
e:
i20
i24
Serv
oe1
e3e2
e1Ju
mpe
r Wire
i19
Jum
per W
ire
h24
+Ju
mpe
r Wire
h24
+Ju
mpe
r Wire
h24
+Ju
mpe
r Wire
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire
e2Ju
mpe
r Wire
e3Ju
mpe
r Wire
Flex
Sen
sor
h19
h20
10KΩ
Res
isto
r
j20
A0
b1+
a2+
a3Pi
n 9
5V5V+
GN
D
And
if yo
u ru
n th
e cod
e aga
in, y
ou'll
see t
he
outp
ut y
ou w
ante
d:fo
r (x
= 1
; x
< 9
; x+
+){
Se
rial
.pri
nt(x
);}
1234
5678
You
want
ed 1
to 8
, but
the l
oop
is ac
tuall
y givi
ng yo
u 0
to 7
. Who
ops!
Now
you
just
need
to �
x the
loop
.
0123
4567
Let's
say
you
wan
ted
a for
() lo
op fr
om 1
to 8
, bu
t you
r cod
e jus
t doe
sn't
seem
to b
e wor
king
rig
ht. J
ust a
dd S
eria
l.beg
in(9
600)
; to
your
se
tup(
) fun
ctio
n, an
d ad
d a S
eria
l.pri
nt()
or
prin
tln()
to y
our l
oop:
for
(x =
0; x
< 8
; x++
){
Se
rial
.pri
nt(x
);}
Controller accessories for videogame consoles like Nintendo’s “Power Glove” use �ex-sensing technology. It was the �rst video game controller attempting to mimic hand movement on a screen in real time.
Circuit 2 Arduino Code:9
Troubleshooting:
Servo Not TwistingEven with colored wires it is still shockingly easy to plug a servo in backwards. �is might be the case.
Servo Not Moving as Expected�e sensor is only designed to work in one direction. Try �exing it the other way (where the striped side faces out on a convex curve).
Servo Doesn’t Move very FarYou need to modify the range of values in the call to the map() function.
You should see the servo motor move in accordance with how much you are �exing the �ex sensor. If it isn't working, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board or see the troubleshooting tips below.
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 9
What You Should See:
Because the flex sensor / resistor combination won't give us a full zero to five-volt range, we're using the map() function as a handy way to reduce that range. Here we've told it to only expect values from 600 to 900, rather than 0 to 1023.
servoposition = map(flexposition, 600, 900, 0, 180);
Because map() could still return numbers outside the "to"
range, we'll also use a function called constrain() that will
"clip" numbers into a range. If the number is outside the
range, it will make it the largest or smallest number. If it is
within the range, it will stay the same.
Serial.print("sensor: ");
Serial.print(flexposition);
Serial.print(" servo: ");
Serial.println(servoposition);
Circuit 2PA
RTS:
CIRCUIT #5
p.10
IC
1X
330ΩResistor
8X
LED
8X
Circuit 2
In this circuit, we are going to use yet another kind of variable resistor – this time, a soft potentiometer (or soft pot). �is is a thin and �exible strip that can detect where pressure is being applied. By pressing down on various parts of the strip, you can vary the resistance from 100 to 10K ohms. You can use this ability to track movement on the soft pot, or simply as a button. In this circuit, we’ll get the soft pot up and running to control an RGB LED.
Soft Potentiometer
PART
S:CIRCUIT #10 10
p.56
Wire
9X
330ΩResistor
3X
LED
1X
Soft Potentiometer
1X
330ΩResistor
3X
10KΩResistor
1X
Pin 0P
in 9
red
Pin
10
green
Pin
11
blue
+5 volts
V+
gnd
wiper
soft
po
t
resistor(Orange-Orange-Brown)
(330ohm)
Brown-Black-Orange)resistor (10K ohm)
GND(ground) (-)
Pin AØP
in 9
Pin
10
Pin
11
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Circ
uit 1
0: S
oft P
oten
tiom
eter
Com
pone
nt:
Imag
e Re
fere
nce:
Com
pone
nt:
Imag
e Re
fere
nce:
Jum
per W
ireG
ND
RGB
LED
(5m
m)
a4a5
a6a7
e7e1
15V
330Ω
Res
isto
rg4
e4 e7e1
15V
330Ω
Res
isto
rg6
e6 e7e1
15V
330Ω
Res
isto
rg7
e7
Jum
per W
ire5V5V
+
Jum
per W
irePi
n 9
h4
Jum
per W
irePi
n 10
h6
Jum
per W
irePi
n 11
h7
e5Ju
mpe
r Wire
j18
Jum
per W
ire
j20
Jum
per W
ire
Jum
per W
irej1
9A0
+
5VSo
ft Po
tent
iom
eter
h19
h18
h20
10KΩ
Res
isto
ri1
9
�e knobs found on many objects, like a radio for instance, are using similar concepts to the one you just completed for this circuit.
Circuit 2 Arduino Code:10
Troubleshooting:
LED Remains Dark or Shows Incorrect ColorWith the four pins of the LED so close together, it’s sometimes easy to misplace one. Try double checking each pin is where it should be.
Bizarre Results�e most likely cause of this is if you’re pressing the potentiometer in more than one position. �is is normal and can actually be used to create some neat results.
You should see the RGB LED change colors in accordance with how you interact with the soft potentiometer. If it isn't working, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board, or see the troubleshoot-ing tips below.
These big, scary functions take a
single Value (RGBposition) and
calculate the three RGB values
necessary to create a rainbow of
color. The functions create three
"peaks" for the red, green, and blue
values, which overlap to mix and
create new colors. Even if you're
not 100% clear how it works, you
can copy and paste this (or any)
function into your own code and
use it yourself.
redValue = constrain(map(RGBposition, 0, 341, 255, 0), 0, 255)
+ constrain(map(RGBposition, 682, 1023, 0, 255), 0, 255);
greenValue = constrain(map(RGBposition, 0, 341, 0, 255), 0, 255)
- constrain(map(RGBposition, 341, 682, 0,255), 0, 255);
blueValue = constrain(map(RGBposition, 341, 682, 0, 255), 0, 255)
- constrain(map(RGBposition, 682, 1023, 0, 255), 0, 255);
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 10
What You Should See:
Circuit 2
In this circuit, we'll again bridge the gap between the digital world and the analog world. We'll be using a buzzer that makes a small "click" when you apply voltage to it (try it!). By itself that isn't terribly exciting, but if you turn the voltage on and o� hundreds of times a second, the buzzer will produce a tone. And if you string a bunch of tones together, you've got music! �is circuit and sketch will play a classic tune. We'll never let you down!
Buzzer
PART
S: Wire
4X
CIRCUIT #11 11
p.60
Piezo Element
1X
Piezo Element
GND(ground) (-)
Pin 9
If the buzzer doesn't easily fit into the holes on the breadboard, try rotating it slightly.
Circ
uit 1
1: P
iezo
Ele
men
ts
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Com
pone
nt:
Imag
e Re
fere
nce:
Piez
o El
emen
t+
-j9
j7
Jum
per W
irePi
n 9
j9
i7
Jum
per W
ireG
ND
Jum
per W
ire
Jum
per W
ire5V5V
+
Ardu
ino
cont
ains
a w
ealth
of b
uilt-
in fu
nctio
ns th
at ar
e use
ful f
or al
l kin
ds o
f thi
ngs.
(See
htt
p://
ardu
ino.
cc/e
n/R
efer
ence
for a
list)
. But
you
can
also
easil
y cr
eate
you
r ow
n fu
nctio
ns. H
ere's
a sim
ple e
xam
ple n
amed
"add
", w
hich
adds
two
num
bers
toge
ther
and
retu
rns t
he re
sult.
Let
's br
eak
it do
wn.
Your
func
tions
can
take
in v
alues
("pa
ram
eter
s"),
and
retu
rn a
valu
e, as
this
one d
oes.
But y
ou ca
n als
o do
eith
er o
r non
e of t
hose
thin
gs, i
f you
wish
.
If yo
u'll
be p
assin
g pa
ram
eter
s /to
/ you
r fun
ctio
n, p
ut th
em (a
nd th
eir ty
pes)
in th
e pa
rent
hese
s afte
r the
func
tion
nam
e. If
you
won
't be
giv
ing
your
func
tion
any
para
met
ers,
just
use a
n em
pty
pare
nthe
sis ()
afte
r the
nam
e.
If yo
u'll
be re
turn
ing
a valu
e /fr
om/ y
our f
unct
ion,
put
the t
ype o
f the
retu
rn v
alue i
n fro
nt o
f the
func
tion
nam
e. �
en in
you
r fun
ctio
n, w
hen
you'
re re
ady
to re
turn
the
valu
e, pu
t in
a ret
urn(
) sta
tem
ent.
If yo
u w
on't
be re
turn
ing
a valu
e, pu
t "vo
id" i
n fro
nt o
f the
func
tion
nam
e (ju
st lik
e you
've a
lread
y se
en fo
r the
setu
p() a
nd lo
op()
fu
nctio
ns).
Whe
n yo
u w
rite y
our o
wn
func
tions
, you
mak
e you
r cod
e nea
ter a
nd ea
sier t
o re
-use
.
Crea
ting
your
ow
n fu
nctio
ns:
int a
dd(i
nt p
aram
eter
1, in
t par
amet
er2)
{ in
t x;
x
= pa
ram
eter
1 +
para
met
er2;
re
turn
(x);
}
Many modern megaphones have settings that use a loud ampli�ed buzzer. �ey are usually very loud and quite good at getting people’s attention.
Circuit 2 Arduino Code:11
Troubleshooting:
No SoundGiven the size and shape of the piezo element it is easy to miss the right holes on the breadboard. Try double checking its placement.
Can't �ink While the Melody is PlayingJust pull up the piezo element whilst you think, upload your program then plug it back in.
Tired of Twinkle Twinkle Little Star�e code is written so you can easily add your own songs.
You should see - well, nothing! But you should be able to hear you piezo element playing "Twinkle, Twinkle Little Star" (or possibly, "�e ABCs"). If it isn't working, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board or see the troubleshooting tips below.
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 11
What You Should See:
Up until now we've been working solely with numerical
data, but the Arduino can also work with text. Characters
(single, printable, letters, numbers and other symbols) have
their own type, called "char". When you have an array of
characters, it can be defined between double-quotes (also
called a "string"), OR as a list of single-quoted characters.
char notes[] = "cdfda ag cdfdg gf ";
char names[] = {'c','d','e','f','g','a','b','C'};
One of Arduino's many useful built-in commands is the
tone() function. This function drives an output pin at a
certain frequency, making it perfect for driving buzzers and
speakers. If you give it a duration (in milliseconds), it will
play the tone then stop. If you don't give it a duration, it
will keep playing the tone forever (but you can stop it with
another function, noTone() ).
tone(pin, frequency, duration);
Circuit 2
Remember before when you played around with a servo motor? Now we are going to tackle spinning a motor. �is requires the use of a transistor, which can switch a larger amount of current than the Arduino can. When using a transistor, you just need to make sure its maximum specs are high enough for your use. �e transistor we are using for this circuit is rated at 40V max and 200 milliamps max – perfect for our toy motor!
Spinning a Motor
PART
S: Wire
6X
CIRCUIT #12 12
1X
DC Motor
1X
Diode1N4148
p.64
TransistorP2N2222AG
1X
When you’re building the circuit be careful not to mix up the transistor and the temperature sensor, they’re almost identical.
330ΩResistor
1X
P2N2
222A
A18
P2N2
222A
A18
FRONT
BACK
GND(ground) (-)
basetransistor P2N2222AG
collector
mo
tor
mul
tim
eter
diode
emitter
+5 volts(5V)
resistor(Orange-Orange-Brown)
(330ohm)
Pin 9
Circ
uit 1
2 : S
pinn
ing
a M
otor
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Com
pone
nt:
Imag
e Re
fere
nce:
Tran
sist
or P
2N22
22AG
a1a3
a2
Jum
per W
ire
Jum
per W
irePi
n 9
j2
Jum
per W
ire
Jum
per W
ire
Jum
per W
ire5V
Jum
per W
ireG
ND
Diod
e 1N
4148
a3G
ND
b7b1
1
e7e1
1
e7e1
1
DC M
otor
5V33
0Ω R
esis
tor
g2e2 e1 a7
+
+
e3d1
1
At th
is po
int y
ou're
pro
babl
y sta
rting
to g
et y
our o
wn
idea
s for
circ
uits
that
do
fun
thin
gs, o
r help
solv
e a re
al pr
oblem
. Exc
ellen
t! H
ere a
re so
me t
ips o
n pr
ogra
mm
ing
in
gene
ral.
Mos
t of t
he sk
etch
es y
ou w
rite w
ill b
e a lo
op w
ith so
me o
r all
of th
ese s
teps
:
1. P
erfo
rm so
me
sort
of i
nput
2. M
ake
som
e ca
lcul
atio
ns o
r dec
isio
ns3.
Per
form
som
e so
rt o
f out
put
4. R
epea
t! (O
r not
!)
We'v
e alre
ady
show
n yo
u ho
w to
use
a bu
nch
of d
i�er
ent i
nput
sens
ors a
nd o
utpu
t de
vice
s (an
d w
e stil
l hav
e a fe
w m
ore t
o go
). Fe
el fre
e to
mak
e use
of t
he ex
ampl
es in
yo
ur o
wn
sket
ches
- th
is is
the w
hole
idea
beh
ind
the "
Ope
n So
urce
" mov
emen
t.
It's u
suall
y pr
etty
easy
to p
ull p
ieces
of d
i�er
ent s
ketc
hes t
oget
her,
just
open
them
in
two
win
dow
s, an
d co
py an
d pa
ste b
etw
een
them
. �is
is on
e of t
he re
ason
s we'v
e be
en p
rom
otin
g "g
ood
prog
ram
min
g ha
bits"
. �in
gs li
ke u
sing
cons
tant
s for
pin
nu
mbe
rs, an
d br
eaki
ng y
our s
ketc
h in
to fu
nctio
ns, m
ake i
t muc
h ea
sier t
o re
-use
you
r co
de in
new
sket
ches
. For
exam
ple,
if yo
u pu
ll in
two
piec
es o
f cod
e tha
t use
the s
ame
pin,
you
can
easil
y ch
ange
one
of t
he co
nsta
nts t
o a n
ew p
in. (
Don
't fo
rget
that
not
all
of t
he p
ins s
uppo
rt an
alog
Wri
te()
; the
com
patib
le pi
ns ar
e mar
ked
on y
our b
oard
.)
If yo
u ne
ed h
elp, t
here
are i
nter
net f
orum
s whe
re y
ou ca
n as
k qu
estio
ns. T
ry
Ardu
ino'
s for
um at
ard
uino
.cc/
foru
m, a
nd S
park
Fun'
s at f
orum
.spar
kfun
.com
. W
hen
you'
re re
ady
to m
ove t
o m
ore a
dvan
ced
topi
cs, t
ake a
look
at A
rdui
no's
tuto
rials
page
at a
rdui
no.c
c/en
/Tut
oria
l. M
any
of S
park
Fun'
s mor
e adv
ance
d pr
oduc
ts w
ere p
rogr
amm
ed w
ith A
rdui
no, (
allow
ing
you
to ea
sily
mod
ify th
em),
or
have
Ard
uino
exam
ples
for t
hem
. See
our
pro
duct
pag
es fo
r inf
o.
Fina
lly, w
hen
you
crea
te so
met
hing
reall
y co
ol, c
onsid
er sh
arin
g it
with
the w
orld
so
that
oth
ers c
an le
arn
from
you
r gen
ius.
(And
be s
ure t
o let
us k
now
so w
e can
put
it
on o
ur h
ome p
age!)
Putti
ng it
all
toge
ther
:
P2N2222AA18
Circuit 2 Arduino Code:12
Troubleshooting:
Motor Not SpinningIf you sourced your own transistor, double check with the data sheet that the pinout is compatible with a P2N2222AG (many are reversed).
Still No LuckIf you sourced your own motor, double check that it will work with 5 volts and that it does not draw too much power.
Still Not WorkingSometimes the Arduino board will disconnect from the computer. Try un-plugging and then re-plugging it into your USB port.
�e DC Motor should spin if you have assembled the circuit’s components correctly, and also veri�ed/uploaded the correct code. If your circuit is not working check the troubleshooting section below.
Code to Note:
Real World Application:
Radio Controlled(RC) cars use Direct Current(DC) motors to turn the wheels for propulsion.
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 12
What You Should See:
The Arduino's serial port can be used to receive as well as
send data. Because data could arrive at any time, the Arduino
stores, or "buffers" data coming into the port until you're
ready to use it. The Serial.available() command returns the
number of characters that the port has received, but haven't
been used by your sketch yet. Zero means no data has arrived.
while (Serial.available() > 0)
If the port has data waiting for you, there are a number of
ways for you to use it. Since we're typing numbers into the
port, we can use the handy Serial.parseInt() command to
extract, or "parse" integer numbers from the characters it's
received. If you type "1" "0" "0" to the port, this function
will return the number 100.
speed = Serial.parseInt();
Circuit 2PA
RTS:
CIRCUIT #5 5
p.10
IC
1X
LED
8X
Circuit 2
In this circuit, we are going to use some of the lessons we learned in circuit 12 to control a relay. A relay is basically an electrically controlled mechanical switch. Inside that harmless looking plastic box is an electromagnet that, when it gets a jolt of energy, causes a switch to trip. In this circuit, you’ll learn how to control a relay like a pro – giving your Arduino even more powerful abilities!
Relays
PART
S:CIRCUIT #13 13
p.68
TransistorP2N2222AG
1X
Relay
1X 1X
Diode1N4148
Wire
14X
330ΩResistor
2X
LED
2X
GND(ground) (-)
basetransistor P2N2222AG
collector
diode(flyback)
coil
NC
NO
com
emitter
5 volts
5 volts
resistor(Orange-Orange-Brown)
(330ohm)
resistor(Orange-Orange-Brown)
(330ohm)
LED LED When the relay is o�, the COM (common) pin will be connected to the NC (Normally Closed) pin. When the relay is on, the COM (common) pin will be connected to the NO (Normally Open) pin.
Pin 2
Circ
uit 1
3: R
elay
s
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Rela
ye9
f9
e15
f15
Com
pone
nt:
Imag
e Re
fere
nce:
e2Ju
mpe
r Wire
h9Ju
mpe
r Wire
+
f5f7
f6
Diod
e 1N
4148
a3G
ND
b7b1
1
Tran
sist
or P
2N22
22AG
a2a4
a3
e7e1
15V
330Ω
Res
isto
rg3
e3 e7e1
15V
330Ω
Res
isto
rg2
e2
Com
pone
nt:
Imag
e Re
fere
nce:
LED
(5m
m)
+-
+-
c19
c20
LED
(5m
m)
+-
+-
c22
c23
i13
Jum
per W
irei1
3e2
2
j5Ju
mpe
r Wire
j7j9
Jum
per W
irei1
5e1
9
Jum
per W
iree1
5e1
9
Jum
per W
iree1
5e1
9
Jum
per W
ireb1
4e1
9
Jum
per W
irea7
a9
Jum
per W
iree4
e9
++ +
Jum
per W
iree1
5e1
9
Jum
per W
iree1
5e1
9
Jum
per W
irea2
3+
Jum
per W
ireG
ND
Jum
per W
ire5V5V
+
Jum
per W
irePi
n 2
j3
Jum
per W
irea2
0
P2N2222AA18
Garage door openers use relays to operate. You might be able to hear the clicking if you listen closely.
Circuit 2 Arduino Code:13
Troubleshooting:
LEDs Not LightingDouble-check that you've plugged them in correctly. �e longer lead (and non-�at edge of the plastic �ange) is the positive lead.
No Clicking Sound�e transistor or coil portion of the circuit isn't quite working. Check the transistor is plugged in the right way.
Not Quite Working�e included relays are designed to be soldered rather than used in a breadboard. As such you may need to press it in to ensure it works (and it may pop out occasionally).
You should be able to hear the relay contacts click, and see the two LEDs alternate illuminating at 1-second intervals. If you don't, double-check that you have assembled the circuit correctly, and uploaded the correct sketch to the board. Also, see the troubleshooting tips below.
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 13
What You Should See:
When we turn on the transistor, which in turn energizes
the relay's coil, the relay's switch contacts are closed. This
connects the relay's COM pin to the NO (Normally Open)
pin. Whatever you've connected using these pins will turn
on. (Here we're using LEDs, but this could be almost anything.)
digitalWrite(relayPin, HIGH);
The relay has an additional contact called NC (Normally
Closed). The NC pin is connected to the COM pin when
the relay is OFF. You can use either pin depending on
whether something should be normally on or normally off.
You can also use both pins to alternate power to two
devices, much like railroad crossing warning lights.
digitalWrite(relayPin, LOW);
Circuit 2
Shift Register
PART
S: Wire
19X
CIRCUIT #14 14
p.72
Now we are going to step into the world of ICs (integrated circuits). In this circuit, you’ll learn all about using a shift register (also called a serial-to-parallel controller). �e shift register will give your Arduino an additional eight outputs, using only three pins on your board. For this circuit, you’ll practice by using the shift register to control eight LEDs.
IC
1X
330ΩResistor
8X
LED
8X
GND(ground) (-)
+5 volts
+5 volts
15 1016
1
2
3
4
5
6
78
11
12
14
13
data
clock
latch
resistors(Orange-Orange-Brown)
(330ohm) LEDs
4
Pin 3
Pin 4
Pin 2
Bend legs to 90° angle.
Align notch on top, inbetween “e5” and “f5” on
the breadboard.
1
2
3
4
5
6
7
8
QB
QC
QD
QE
QF
QG
QH
GND
VCC
QA
SER
OE
RCLK
SRCLK
SRCLR
QH’
16
15
14
13
12
11
10
9
Circ
uit 1
4: S
hift
Regi
ster
ab
cd
ef
gh
i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
ab
cd
ef
gh
i
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Com
pone
nt:
Imag
e Re
fere
nce:
Com
pone
nt:
Imag
e Re
fere
nce:
LED
(5m
m)
+-
+-
c14
c15
LED
(5m
m)
+-
+-
c17
c18
LED
(5m
m)
+-
+-
c20
c21
LED
(5m
m)
+-
+-
c23
c24
LED
(5m
m)
+-
+-
h14
h15
LED
(5m
m)
+-
+-
h17
h18
LED
(5m
m)
+-
+-
h20
h21
LED
(5m
m)
+-
+-
h23
h24 a3a15
330Ω
Res
isto
r
a3G
ND
c23
a18
330Ω
Res
isto
r
a3G
ND
c23
a21
330Ω
Res
isto
r
a3G
ND
c23
a24
330Ω
Res
isto
r
a3G
ND
j15
c24
330Ω
Res
isto
r
a3G
ND
j18
c24
330Ω
Res
isto
r
a3G
ND
j21
c24
330Ω
Res
isto
r
a3G
ND
j24
c24
330Ω
Res
isto
r
ICe5 f5
e6 f6
e7 f7
e8 f8
e9 f9
e10
f10
e11
f11
e12
f12 a3G
ND
Jum
per W
ire+
+
a3G
ND
Jum
per W
ire+
+ a3G
ND
Jum
per W
irej5
+ a3G
ND
Jum
per W
irej6
a14
Jum
per W
ire
a3G
ND
Jum
per W
irej8
a14
Jum
per W
ire
Jum
per W
ire
a3G
ND
Jum
per W
iref1
4a8 a3
GN
DJu
mpe
r Wire
f17
a9 a3G
ND
Jum
per W
iref2
0a1
0 a3G
ND
Jum
per W
iref2
3a1
1 a3G
ND
Jum
per W
irea2
3a7 a3
GN
DJu
mpe
r Wire
a20
a6 a3G
ND
Jum
per W
irea1
7a5 a3
GN
DJu
mpe
r Wire
a14
j6
Jum
per W
ire
Jum
per W
ire
j7Pi
n 2
j9Pi
n 4
j10
Pin
3
a3G
ND
Jum
per W
irej1
1a1
4+
j10
5V+
GN
D
Similar to circuit #4, a scrolling marquee display delivers a mesage with multiple LEDs. Essentially the same task the shift register achieves here in Circuit #14.
Circuit 2 Arduino Code:14
Troubleshooting:
�e Arduino's power LED goes out �is happened to us a couple of times, it happens when the chip is inserted backward. If you �x it quickly nothing will break.
Not Quite WorkingSorry to sound like a broken record but it is probably something as simple as a crossed wire.
FrustrationShoot us an e-mail, this circuit is both simple and complex at the same time. We want to hear about problems you have so we can address them in future editions: techsupport@sparkfun.com
You should see the LEDs light up similarly to in circuit 4 (but this time, you're using a shift register). If they aren't, make sure you have assembled the circuit correctly and veri�ed and uploaded the code to your board, or see the troubleshooting tips below.
Code to Note:
Real World Application:
Open Arduino IDE // File > Examples > SIK Guide > Circuit # 14
What You Should See:
You'll communicate with the shift register (and a lot of other parts)
using an interface called SPI, or Serial Peripheral Interface. This
interface uses a data line and a separate clock line that work together
to move data in or out of the Arduino at high speed. The MSBFIRST
parameter specifies the order in which to send the individual bits, in
this case we're sending the Most Significant Bit first.
shiftOut(datapin, clockpin, MSBFIRST, data);
Bits are the smallest possible piece of memory in a computer; each
one can store either a "1" or a "0". Larger numbers are stored as arrays
of bits. Sometimes we want to manipulate these bits directly, for
example now when we're sending eight bits to the shift register and
we want to make them 1 or 0 to turn the LEDs on or off. The Arduino
has several commands, such as bitWrite(), that make this easy to do.
bitWrite(data,desiredPin,desiredState);
This is just the beginning of your exploration into embedded electronics and coding. Our website has a wealth of tutorials to whet your appetite for more knowledge. We also host a community of hackers, engineers, DIYers, etc. in our forums. So log on to our website for more information about Arduino, or to plan ahead for your next project!
sparkfun.com
Visit us Online:
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NOTES:
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