Hardware Hacking for JavaScript Engineers
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This document discusses hardware hacking for JavaScript developers. It introduces several hardware platforms that can be programmed with JavaScript, including Arduino, Tessel, Raspberry Pi, and Johnny-Five. Examples are provided on how to program an LED to blink on these platforms using JavaScript. The document also discusses prototyping smart home devices and provides an example of a "KittyCam" project that streams photos and detects cats using hardware, a Raspberry Pi, and Node.js.
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Hardware Hacking for JavaScript Engineers
- 1. @girlie_mac Hardware Hacking for JavaScript Devs Tomomi Imura (@girlie_mac) Hardware Hacking for JavaScript Devs https://flic.kr/p/8tuc1u by randomliteraturecouncil CC-BY 2.0
- 2. @girlie_mac
- 3. @girlie_mac I am a: ● Front-End Engineer ● N00b Hardware Hacker ● Sr. Developer Evangelist at PubNub ● (Former) Mobile Geek ● Cat Lady of The InterWeb
- 4. @girlie_mac
- 5. @girlie_mac
- 6. @girlie_mac Era of Internet of Things Source: Cisco IBSG https://www.cisco.com/web/about/ac79/docs/innov/IoT_IBSG_0411FINAL.pdf
- 7. @girlie_mac Withings: Smart Body Analyzer GE Link Cinder Sensing Cooker Nest: Learning Thermostat Whistle: Connected pet collar Amazon Dash Button
- 8. @girlie_mac Thermostats get Internet! Bulbs get Internet! Everything gets Internet!
- 9. @girlie_mac OK, connect me with InterWeb... Srsly, where should I start?
- 10. @girlie_mac Arduino ● MCU-based kit ● Open-Source hardware & software (IDE) ● The first developer-friendly boards
- 11. @girlie_mac Arduino USB PLUG TO COMPUTER EXTERNAL POWER SOURCE GPIO DIGITAL PINS ANALOG PINS
- 12. @girlie_mac Microprocessor v. Microcontroller “CPU Core” ● CPU ● Typically used in PC w/ external memory “Computer on chip” ● CPU + Memory + Peripherals ● I/O Interface ● Cost-effective
- 14. @girlie_mac LittleBits & Arduino at Heart 9V BATTERY USB PLUG TO COMPUTER MODULES
- 15. @girlie_mac Tessel USB PLUGS TO COMPUTER ETHERNET MODULES GPIO DIGITAL PINS EXTRA USB PORTS
- 16. @girlie_mac Programming Tessel in Node.js var tessel = require('tessel'); var camera = require('camera-vc0706').use(tessel.port['A']); camera.on('ready', function() { camera.takePicture(function(err, image) { if (err) { console.log(err); } else { var name = 'pic-' + Date.now() + '.jpg'; process.sendfile(name, image); camera.disable(); } }); }); the port the camera module is plugged in ready event callback
- 18. @girlie_mac Raspberry Pi USB TO POWER SOURCE TO MONITOR TO MOUSE TO KEYBOARD WI-FI ADAPTER SD CARD GPIO DIGITAL PINS 4 EXTRA USB PORTS ETHERNET
- 20. @girlie_mac Programming Raspberry Pi Pre-installed on RPi: C / C++
- 21. @girlie_mac LED: Hello World of Hardware
- 22. @girlie_mac OMG, Physics: Know Your LEDs! Cathode (-) Anode (+) - + 1.9V 3.2V - +
- 23. @girlie_mac Ohm’s Law & Resistors R = V - Vs f I source voltage (V) forward voltage (V) (LED voltage drop) current thru the LED (A) resistance (Ω)
- 24. @girlie_mac Ohm’s Law & Resistors R = 3.3 - 1.9 0.02 source voltage (V) forward voltage (V) (LED voltage drop) current thru the LED (A) resistance (Ω) = 70Ω
- 26. @girlie_mac Resistor Color Code (4-Band) 47 x 1000 = 4.7 k Ohms 4 7 102 +/- 5% multiplier tolerance Learn more at: https://learn.adafruit.com/multimeters/resistance
- 27. @girlie_mac Resistor Color Code (5-Band) 200 x 1 = 200 Ohms 2 0 100 +/- 1% 0 multiplier tolerance
- 31. @girlie_mac Blinking LED in Python import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) LED = 4 GPIO.setup(LED,GPIO.OUT) for i in range(6): GPIO.output(LED,True) time.sleep(0.5) GPIO.output(LED,False) time.sleep(0.5) import RPi.GPIO libs GPIO 4 pin (Pin 7) set LED pin as output toggle light pin signal to low/high to make it blink.
- 32. @girlie_mac Programming Pi in Node.js Download & install Node.js from terminal: $ wget http://node-arm.herokuapp. com/node_latest_armhf.deb $ sudo dpkg -i node_latest_armhf.deb
- 33. @girlie_mac Meet Johnny-Five! ● JavaScript robotics framework ● Works with Arduino-compatible Boards ● IO plugins for more platform supports Woot!
- 34. @girlie_mac Blinking LED var five = require('johnny-five'); var raspi = require('raspi-io'); var board = new five.Board({io: new raspi()}); board.on('ready', function() { var led = new five.Led(P1-7); // Create an instance led.blink(500); // "blink" in 500ms on-off phase periods }); Pin 7 (GPIO-4) Plugin for RPI (Default w/o plugins works for all Arduino)
- 36. @girlie_mac Prototyping Smart Light Bulbs By Kevin Gleason Vine URL: https://vine. co/v/ehPivZOeK9P Controlling RGB values from a mobile phone
- 37. @girlie_mac Smart Home (LEGO Version) By Geremy Cohen
- 38. @girlie_mac Smart Home (LEGO Version)
- 39. @girlie_mac Starting Simple Vine URL: https://vine. co/v/erUUw2ZUYq e Using Pulse-width modulations to control the brightness of the lights
- 40. @girlie_mac Streaming Data Data streaming among devices w/ PubNub
- 42. @girlie_mac
- 43. @girlie_mac KittyCam in Node.js 1. Detect motion (Johnny-Five IR.Motion obj) 2. Take photos (Raspistill, command line tool) 3. Cat facial detection (KittyDar) 4. Store the photos in Cloudinary 5. Publish the data to PubNub 6. Stream on web (subscribe the data from PubNub)
- 44. @girlie_mac I hacked hardware so you can too! Join meetups & events like Int’l NodeBots Day!