Nodebots 101

What we will cover

  • Socket.io
  • Johnny-five and Arduino
  • Raspberry Pi and others

What's Socket.io

  • JavaScript library for realtime web applications
  • realtime, bi-directional communication between web clients and server
  • client-side library that runs in the browser,
  • server-side library for node.js

Server side

//Express server setup
var express = require("express");
var app = express();
var server = require("http").createServer(app);
var port = 8888;

server.listen(port, function () {
    console.log("Server started on port " + port);
});

app.use(express.static(__dirname + "/../"));

//Socket setup

var io = require("socket.io")(server);
io.on("connection", function (socket) {
    socket.on("messageFromClient", function (data) {
        socket.broadcast("messageFromServer", data);
    });
});

Client Side


<body>

<input type="text" id="textField" /> <button type="button" id="sendMsg">Send</button>
<textarea id="msgBox"></textarea>

</body>
<script src="/socket.io/socket.io.js"></script>
<script type="text/javascript">
    var socket = io();

    document.getElementById("sendMsg").onclick = function() {
        socket.emit("messageFromClient", {text: document.getElementById("textField").value});
    };

    socket.on("messageFromServer", function(data) {
        document.getElementById("msgBox").value += data.text;
    });

</script>

What's Johnny-Five

  • IoT and Robotics programming framework
  • Johnny-Five programs can be written for Arduino, Beagle Bone, Intel Galileo & Edison, Pinoccio, Raspberry Pi, Spark Core, TI Launchpad and more!

Hello World

var five = require("johnny-five");
var board = new five.Board();

var led1;

board.on("ready", function() {
    led1 = new five.Led("13");

    led1.blink();
});

Arduino demo

Led circuit

Button Circuit

Spark

  • (yn)

Raspberry Pi

  • (yn)

Nodebots 101

By Joel Lord

Nodebots 101

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