add sensor module

nodejs/ar-com/sensor.js

@@ -0,0 +1,31 @@
+var events = require('events'),
+    util = require('util');
+
+var Sensor = function (arduino, pin) {
+  if(!arduino || !pin) {console.log("Arduino or pin not set!");}
+  this.arduino = arduino;
+  this.pin = pin;
+
+  this.board.on('data', function (message) {
+    var m = message.slice(0, -1).split('::'),
+        err = null;
+
+    if (m.length != 2 && this.pin != m[0]) {
+      return;
+    }
+
+    this.emit('read', err, m[1]);
+    
+  }.bind(this));
+
+}
+
+util.inherits(Sensor, events.EventEmitter);
+
+Sensor.prototype.trigger = function() {
+
+  this.arduino.write(new Buffer('Y' + String.fromCharCode(this.pin) + '000000', 'ascii'));  
+
+};
+
+module.exports = IR;