example03.js

var http = require("http").createServer(handler);
var io = require("socket.io").listen(http);
var fs = require("fs");
var firmata = require("firmata");

var board = new firmata.Board("/dev/ttyACM0", function(){

    console.log("Connecting to Arduino");
    console.log("Acctivation of Pin 13");
    console.log("Acctivation of Pin 12");
    board.pinMode(13, board.MODES.OUTPUT);
    board.pinMode(12, board.MODES.OUTPUT);
});

function handler(req, res) {
  fs.readFile(__dirname + "/example03.html",
  function(err, data)  {
    if (err) {
        res.writeHea(500, {"Content-Type": "text/plain"});
        return res.end("Error loading html page.");
    }
  res.writeHead(200);
  res.end(data);
});
}

http.listen(8080);

io.sockets.on("connection", function(socket) {
  socket.on("commandToArduino", function(commandNo) {
    if (commandNo == "1") {
        board.digitalWrite(13, board.HIGH);
    }
    if (commandNo == "0") {
      board.digitalWrite(13, board.LOW);
    }
    if (commandNo == "3") {
        board.digitalWrite(12, board.HIGH);
    }
    if (commandNo == "2") {
      board.digitalWrite(12, board.LOW);
    }
  });
});