Sending LED data over Serial with NodeJS

led-sender.js

var serialport = require("serialport"),
	SerialPort = serialport.SerialPort;

// first list the serial ports available so we can figure out which is the arduino
serialport.list(function (err, ports) {
	var port = null;
	ports.forEach(function(p) {
		// this should work on windows and maybe osx
		if (p.manufacturer.indexOf('Arduino')!==-1) {
			port = p.comName;
		} else {
			// this will work on raspberry pi / linux
			if (p.hasOwnProperty('pnpId')){
				// FTDI captures the duemilanove //
				// Arduino captures the leonardo //
				if (p.pnpId.search('FTDI') != -1 || p.pnpId.search('Arduino') != -1) {
					port = p.comName;
				}
			}
		}
	});

	// port should now contain a string for the com port
	// open the port
	var serialPort = new SerialPort(port, {
		baudrate: 115200
	});
	// hook up open event
	serialPort.on("open", function () {
		// port is open
		console.log('port ' + port + ' opened');
		// hook up data listener to echo out data as its received
		serialPort.on('data', function(data) {
			console.log('data received: ' + data);
		});

		// here's an array of LED color values, 3 bytes per LED.
		var LEDS = [
			255,0,0,
			0,0,0,
			0,0,0,
			0,0,0,
			0,0,255
		];

		// create a Buffer object to hold the data
		var buffer = new Buffer(LEDS);
		// write it on the port
		serialPort.write(buffer, function(err, results) {
			if (err) {
				console.log('err ' + err);
			}
			console.log('wrote bytes : ' + results);
		});
	});
});