DIY Wireless Sensor Networks18 Nov 2013, 9:00am, Dreamforce

Reid Carlberg, Salesforce.com, Director - Evangelism

@ReidCarlberg (Link)

Update: 30 Jan 2014 (a)

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REST API

Streaming API

Node JS

XBee

http://github.com/ReidCarlberg/DF13_WirelessSensorNetwork

We’re Building a Wireless Sensor Network

Hands on making is the best way to learn connected device app development.

Arduino – Open Source Prototyping Board.

ATmega328 Controller

32k of RAM

Easy to program (~C++)

No SSL.Arduino Classes here Tues & Thurs

XBee

Cheap, easy

Serial communication

Self configuringStop by the Etherios table to learn more!

Raspberry Pi

Single board computer

Education focused

Runs Linux/Python/Node

Network Aware

SSL Capable

Salesforce Platform

APIs make it dead easy

Free developer edition

We all know how to use it

Bill Of Materials

Arduino Experimenter’s Kit: $85

Arduino XBee Shield: $25

XBee Pro Series 1 (2): $76

Raspberry Pi Starter Pack: $105

Xbee Adapter Kit: $10

Salesforce Developer Edition: FREE

9V Battery: $2

Total: $303

Breadboards

+/- conduct up and down.

#’s conduct side to side

A,b,c,d,e, etc don’t matterVoltage goes to + (red)

Ground goes to – (blue)

Put component leads in different #

rows – up and down, not side to side

Wires

Red or Orange – Positive

Black or Green – Negative

Otherwise doesn’t matter

Polarity Sometimes Matters

Positive is voltage in.

Negative is voltage out.

Matters on: LED, TMP36

Doesn’t matter on: RESISTORS,

PIEZO

On an LED, the long lead

is POSITIVE.

Know Your Voltage

3.3V or 5.0V

Everything today is 5.0V

safe.

**Connect to 5V

Get Everything Out

It’s in a bag on top.

You can dig through the

explorer kit later.

Assemble the Shield

Stack the wireless shield

on top of the Arduino.

Be careful not to bend any

pins!

Add the XBee

Don’t force it.

Make sure all the pins are

in.

Add Components to Breadboard

LED: Positive lead up

TMP36: Flat side, right.

Put things in the F column

toward the center.

Positive Leads

+ + +

Add Components to Breadboard (optional view)

“Fritzing” Style illustration

Note the vertical bars on

right – polarity reversed!Careful:

RED & BLUEREVERSED

Add Resistors to Negative LED leads

Resistors connect

negative LED leads with

GROUND.

Remember Fritzing may

not match your board!

Connect Power

+/Red to 5V

-/Blue to Ground

Connect Positive LED leads to Arduino

Purple LED to Digital 2

Green LED to Digital 3

Red LED to Digital 4

Connect Piezo Speaker

Top pin to Arduino Digital 5

Bottom pin to to -/Blue

(Ground)

Connect TMP36 – PLEASE DOUBLE CHECK

Middle to A0

Top to - / Blue (Ground)

Bottom to + / Red

Polarity Matters here –

reversed wiring will result in a

VERY HOT TMP36.

Plug In The Battery!

Purple & Green Light = initializing.

Purple (flashing) = Xbee activity

Green = ready

Red = alarm

Disco Lights = DISCO

If you smell something burning your

TMP36 is wired wrong. Disconnect your

battery, wait for it to cool & try again.

Raspberry Pi in action

Connected to the network.

GPIO cable to breadboard

XBee to TTYAMA0

Org Configuration

Apex REST Streaming API

Communication Protocol

To Arduino

^Address:Message\n

Address = 2 char

Message = 5 char

Specific Unit Ex: ^A1:ALARM\n

All Units Ex: ^00:DISCO\n

To Raspberry Pi

REST format (single line)

{

“addr”:”A1”,

“msg”:”hello”,

“detail”:”tmp36,alarm,disco”

}

System Flow

Lessons Learned

Prototype, not production.

Test with a meaningful # of devices.

Easy to set up race conditions.

Arduino is limited.

Simple communication protocols are better.

@ReidCarlberg (Link)http://github.com/ReidCarlberg/DF13_WirelessSensorNetwork