IoT Projects - DIY Wireless Sensor Network at Dreamforce 2013 #DevZoneLab
- 1. DIY Wireless Sensor Networks 18 Nov 2013, 9:00am, Dreamforce Reid Carlberg, Salesforce.com, Director - Evangelism @ReidCarlberg(Link) Update: 30 Jan 2014 (a)
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- 3. We’re Building a Wireless Sensor Network REST API XBee Streaming API Node JS http://github.com/ReidCarlberg/DF13_WirelessSensorNetwork
- 4. Hands on making is the best way to learn connected device app development.
- 5. Arduino – Open Source Prototyping Board. ATmega328 Controller 32k of RAM Easy to program (~C++) No SSL. Arduino Classes here Tues & Thurs
- 6. XBee Cheap, easy Serial communication Self configuring Stop by the Etherios table to learn more!
- 7. Raspberry Pi Single board computer Education focused Runs Linux/Python/Node Network Aware SSL Capable
- 8. Salesforce Platform APIs make it dead easy Free developer edition We all know how to use it
- 9. 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
- 10. Breadboards +/- conduct up and down. #’s conduct side to side A,b,c,d,e, etc don’t matter Voltage goes to + (red) Ground goes to – (blue) Put component leads in different # rows – up and down, not side to side
- 11. Wires Red or Orange – Positive Black or Green – Negative Otherwise doesn’t matter
- 12. 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.
- 13. Know Your Voltage 3.3V or 5.0V Everything today is 5.0V safe. **Connect to 5V
- 14. Get Everything Out It’s in a bag on top. You can dig through the explorer kit later.
- 15. Assemble the Shield Stack the wireless shield on top of the Arduino. Be careful not to bend any pins!
- 16. Add the XBee Don’t force it. Make sure all the pins are in.
- 17. Add Components to Breadboard LED: Positive lead up Positive Leads TMP36: Flat side, right. Put things in the F column toward the center. + + +
- 18. Add Components to Breadboard (optional view) “Fritzing” Style illustration Note the vertical bars on right – polarity reversed! Careful: RED & BLUE REVERSED
- 19. Add Resistors to Negative LED leads Resistors connect negative LED leads with GROUND. Remember Fritzing may not match your board!
- 20. Connect Power +/Red to 5V -/Blue to Ground
- 21. Connect Positive LED leads to Arduino Purple LED to Digital 2 Green LED to Digital 3 Red LED to Digital 4
- 22. Connect Piezo Speaker Top pin to Arduino Digital 5 Bottom pin to to -/Blue (Ground)
- 23. 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.
- 24. 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.
- 25. Raspberry Pi in action Connected to the network. GPIO cable to breadboard XBee to TTYAMA0
- 27. Communication Protocol To Arduino To Raspberry Pi ^Address:Messagen REST format (single line) Address = 2 char { Message = 5 char “addr”:”A1”, Specific Unit Ex: ^A1:ALARMn “msg”:”hello”, All Units Ex: ^00:DISCOn “detail”:”tmp36,alarm,disco” }
- 28. System Flow
- 29. 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.