add ir module

nodejs/ar-com/ir.js

@@ -0,0 +1,39 @@
+var events = require('events'),
+    util = require('util');
+
+var IR = function (arduino) {
+  if(!arduino) {console.log("Arduino not set!");}
+  this.arduino = arduino;
+}
+
+util.inherits(Sensor, events.EventEmitter);
+
+IR.prototype.send = function(type, len, val) {
+  
+  type = String.fromCharCode(type);
+  len = String.fromCharCode(len);
+  val = this.arduino.valueToLastFour(val);
+  
+  this.arduino.write(new Buffer('X0' + type + len + val,'ascii'));
+
+};
+
+IR.prototype.receive = function() {
+
+  this.board.on('data', function (message) {
+    var m = message.slice(0, -1).split('::'),
+        err = null;
+
+    if (m.length != 3) {
+      return;
+    }
+
+    this.emit('read', err, m);
+    
+  }.bind(this));
+
+  this.arduino.write(new Buffer('Y0000000', 'ascii'));  
+
+};
+
+module.exports = IR;