title: HC-06 bluetooth module
body: <p>I need help with the blinking LED of my HC-06 Bluetooth module.</p>
  
  <p>I just want to know what it means when it starts blinking, when it's always on and when it's not on at all and how do I know if it's connected or paired by the LED.</p>
  
  <p>My second question is that I'm developing an Android app that sends data to an Arduino UNO board via this Bluetooth module, but every time I try to send my data, the app crashes.</p>