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Controlling robots using javascript


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Controlling Robots using JavaScript. Slides from my talk at jsfoo. Details at

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Controlling robots using javascript

  1. 1. Controlling robots using JavaScript Sudar Muthu (@sudarmuthu) Research Engineer, Yahoo! Labs
  2. 2. Who am I? Research Engineer by profession Creates robots as hobby Prefers Arduino Prefers JavaScript at work Why not combine both of them? .. and that’s what I am going to talk about today
  3. 3. Why hardware for a software hacker? Fun!
  4. 4. Let’s start with a demo Demo
  5. 5. Participate in the demo  Visit
  6. 6. Control the bot at stage @hardwarefun
  7. 7. Arduino Visual Basic for hardware Includes both Hardware and software Photo credit Arduino team
  8. 8. Interfacing Arduino with JavaScript Using serial connection (node-serialport) Using abstraction (like johnny-five or duino) Using serial Bluetooth connection (asimijs)
  9. 9. Using Serial ConnectionYou need node-serialport - SerialPort = require("serialport").SerialPort, arduino = new SerialPort("/dev/tty/ACM1");// when data is received from arduinoarduino.on("data", function (data) { arduino.write(new Buffer[data]); console.log("Got: " + data);});// if there was any errorarduino.on("error", function (data) { console.log("Error: " + data);});
  10. 10. Using Abstraction Build on top of node-serialport - Options include Johnny-five - and duino - Load the firmdata program into Arduino It provides the necessary abstraction Write code using a node.js library Profit 
  11. 11. DemoLet there be LIGHT
  12. 12. Codevar five = require("johnny-five"), board = new five.Board();board.on("ready", function() { // Create an Led on pin 13 (new five.Led(13)).strobe(1000);});
  13. 13. Hardware setup
  14. 14. Reading sensor data What you need?Any sensor and a LED
  15. 15. Reading sensor datavar five = require("johnny-five"), board, led, photoresistor;board = new five.Board();board.on("ready", function() { // Create a new `photoresistor` hardware instance. photoresistor = new five.Sensor({pin: "A2”, freq: 250}); led = new five.Led(13); // "read" get the current reading from the photoresistor photoresistor.on("read", function( err, value ) { if (value > 50) { led.on(); } else {; } console.log( value, this.normalized ); }); // Inject the `sensor` hardware into the Repl instances context; // allows direct command line access board.repl.inject({ pot: photoresistor });});
  16. 16. Using serial Bluetooth connection Bluetooth shield gives wireless capability to Arduino A Bluetooth connection appears as serial port in your computer Using node-serialport you can talk wirelessly to Arduino And that’s what I did for demo ;)
  17. 17. Using serial Bluetooth connectionvar SerialPort = require("serialport").SerialPort, bt = new SerialPort("/dev/cu.FireFly-CCFA-SPP");// when data is received from bluetoothbt.on("data", function (data) { bt.write(new Buffer[data]); console.log("Got: " + data);});// error reading bluetooth serial portbt.on("error", function (data) { console.log("Error: " + data);});
  18. 18. How the demo worked Node.js Server Node ClientAdmin page User page User page User page
  19. 19. Links AsimiJS – The demo that I showed initially Asimi – A simple bot using Arduino Getting started with hardware programming hardware-programming Getting started with Arduino and-avr Node-serialport serialport Johnny Five
  20. 20. QuestionsThank YouSudar Muthu (@sudarmuthu)