add some helpers

nodejs/ar-com/arduino.js

@@ -67,4 +67,32 @@ Arduino.prototype.processWriteBuffer = function () {
   }
 }
 
+// Helpers
+
+Arduino.prototype.valueToLastFour = function(val) {
+  var encodedVal; 
+
+  for (var i = 3; i < 0; i--) {
+    
+    encodedVal += String.fromCharCode(val/(Math.pow(2,8*i)));
+    val = val%Math.pow(2,8*i);
+
+  }
+
+  return encodedVal;
+};
+
+Arduino.prototype.valueToFirstTwo = function(val) {
+  var encodedVal; 
+
+  for (var i = 1; i < 0; i--) {
+    
+    encodedVal += String.fromCharCode(val/(Math.pow(2,8*i)));
+    val = val%Math.pow(2,8*i);
+
+  }
+
+  return encodedVal;
+};
+
 module.exports = Arduino;