Using the Arduino to Make an LED FlashWork in teams of two!

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14 digital I/O pins (I/O = input / output)

USB cable plug

power pins

6 analog input pins

© 2012 David Hall

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The content of this presentation is for informational purposes only and is intended only for students attending Louisiana Tech University.

The author of this information does not make any claims as to the validity or accuracy of the information or methods presented.

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The Circuit

470W

digital I/O pin 0

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NOTE: It would probably be better to use a different pin than digital pin 0 since this pin receives information from your computer through the USB cable. The RX printed beside pin 0 and the TX printed beside pin 1 mean “receive” and “transmit,” respectively.

digital pin 0

enter and run the following sketch

Enter and run the following sketch:

void setup() { // initialize the digital pin as an output: pinMode(0, OUTPUT); }

void loop() { digitalWrite(0, HIGH); // set the LED on delay(1000); // wait for a second digitalWrite(0, LOW); // set the LED off delay(500); // wait for 500 ms}

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how the sketch works

HIGH = 5V and LOW = 0V (Always!!!!)

void setup() {

pinMode(0, OUTPUT); }

void loop() { digitalWrite(0, HIGH); delay(1000); digitalWrite(0, LOW); delay(500); }

initialize pin 0 as an output

infin

ite lo

op

set pin 0 to LOW (0V)wait 500 ms

set pin 0 to HIGH (5V)wait 1000 ms

time (ms)

volta

ge (V

)

0V

5V500 ms1000 ms

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Now Experiment on Your Own!

(1) Try changing the time to 1.5 seconds on and 1 second off

(2) Connect the resistor to digital pin 5 and change the program to match

(3) Blink out SOS in Morse code (dot-dot-dot-dash-dash-dash-dot-dot-dot)a. three short pulses (0.25 seconds each) followed by . . .b. three long pulses (0.75 second each) followed by . . .c. three short pulses (0.25 seconds each) followed by . . .d. a brief pause (1 second) e. repeat a through d using an infinite loop

Show your instructor when you have completed exercise (3)

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Find each command in the reference section of arduino.cc(discuss each command with others at your table)

void setup() { // initialize the digital pin as an output: pinMode(0, OUTPUT); }

void loop() { digitalWrite(0, HIGH); // set the LED on delay(1000); // wait for a second digitalWrite(0, LOW); // set the LED off delay(500); // wait for 500 ms}

The End

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