title: ADK blink tutorial: on board LED is always on
body: <p>I have a <a href="https://rads.stackoverflow.com/amzn/click/com/B001VK18HC" rel="nofollow noreferrer" rel="nofollow noreferrer">Duemilanove</a> and <a href="http://www.elechouse.com/elechouse/index.php?main_page=product_info&amp;cPath=74&amp;products_id=2149" rel="nofollow noreferrer">ADK</a> and I followed <a href="http://allaboutee.com/2011/12/31/arduino-adk-board-blink-an-led-with-your-phone-code-and-explanation/" rel="nofollow noreferrer">this</a> and with the exception of some SDK updates, I followed it exactly. </p>
  
  <p>Problem: the onboard LED doesn't blink but is always on. </p>
  
  <p>Issues:</p>
  
  <ul>
  <li>byte array is being successfully sent to the ADK from the phone, verified by monitoring serial port of arduino board</li>
  <li>High &amp; low signal is being properly handled in the arduino code (same verification). </li>
  <li>the blink tutorial without the ADK blinks the on board LED properly. </li>
  </ul>
  
  <p>So, what is wrong? Is it possible that the ADK board is always sending a HIGH signal to the on board LED and I need to use an 'external' LED for testing? A lot of the tutorials I've seen do this so could that be why? </p>