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Controlling robots using JavaScript Sudar Muthu (@sudarmuthu) Research Engineer, Yahoo! Labs http://hardwarefun.com http://github.com/sudar

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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

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Why hardware for a software hacker? Fun!

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Let’s start with a demo Demo http://hardwarefun.com/projects/asimijs

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Participate in the demo  Visit http://hardwarefun.com:3000

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Control the bot at stage http://hardwarefun.com/projects/asimijs#asimijs @hardwarefun

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Arduino Visual Basic for hardware Includes both Hardware and software Photo credit Arduino team

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Interfacing Arduino with JavaScript Using serial connection (node-serialport) Using abstraction (like johnny-five or duino) Using serial Bluetooth connection (asimijs)

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Using Serial ConnectionYou need node-serialport - https://github.com/voodootikigod/node-serialportvar 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);});

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Using Abstraction Build on top of node-serialport - https://github.com/voodootikigod/node-serialport Options include Johnny-five - https://github.com/rwldrn/johnny-five and duino - https://github.com/ecto/duino Load the firmdata program into Arduino It provides the necessary abstraction Write code using a node.js library Profit 

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DemoLet there be LIGHT

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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);});

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Hardware setup

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Reading sensor data What you need?Any sensor and a LED

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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 { led.off(); } console.log( value, this.normalized ); }); // Inject the `sensor` hardware into the Repl instances context; // allows direct command line access board.repl.inject({ pot: photoresistor });});

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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 ;)

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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);});

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How the demo worked Node.js Server Node ClientAdmin page User page User page User page

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Links AsimiJS – The demo that I showed initially http://hardwarefun.com/projects/asimijs Asimi – A simple bot using Arduino http://hardwarefun.com/project/asimi Getting started with hardware programming http://hardwarefun.com/tutorials/getting-started-with- hardware-programming Getting started with Arduino http://hardwarefun.com/tutorials/getting-started-with-arduino- and-avr Node-serialport https://github.com/voodootikigod/node- serialport Johnny Five https://github.com/rwldrn/johnny-five

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QuestionsThank YouSudar Muthu (@sudarmuthu) http://hardwarefun.com http://gitbub.com/sudar