diff --git a/nodejs/ar-com/arduino.js b/nodejs/ar-com/arduino.js
index 2dfdbd5..f826fe0 100644
--- a/nodejs/ar-com/arduino.js
+++ b/nodejs/ar-com/arduino.js
@@ -3,8 +3,9 @@ var events = require('events'),
     util   = require('util'),
     serial = require("serialport");
 
-var Arduino = function (baudrate) {
+var Arduino = function (baudrate, debug) {
   this.baudrate = baudrate && baudrate || 9600;
+  this.debug = debug && debug || false;
   this.writeBuffer = [];
 }
 
@@ -38,10 +39,11 @@ Arduino.prototype.setup = function () {
     self.serial.on('open', function () { setTimeout(function () {
       self.serial.write(new Buffer('00000000'));
       self.serial.write(new Buffer('Zn000000', 'ascii'));
+      if(self.debug) { self.serial.write(new Buffer('P0000000', 'ascii')); }
       self.emit('success');
       
       self.serial.on('data', function(data){
-        console.log(data);
+        if(self.debug) { console.log(data) };
         self.emit('data', data);
       });