trev/nodejs/routes/index.js

var express = require('express');
var router = express.Router();
var Arduino = new require('../ar-com/arduino');
var arduino = new Arduino();

arduino.setup();

/* GET home page. */ 
router.get('/', function(req, res, next) {
  res.render('index', { title: 'Express' });
});

router.get('/toggleLight', function (req, res) {
  var s = "0FFF0FFF000F";
  var str = "";
  for(i = 0; i < s.length; i+=2) { str += String.fromCharCode(parseInt(s.substr(i,2), 16)); }
  arduino.write(new Buffer('Wa' + str,'ascii'));
  res.send('switch light');
});

module.exports = router;