title: Sending Data through Headphone jack in Android phones
body: <p>I'm currently dealing with a new project and I have to send data through headphone jack with specific voltage, then i can work on that voltage.</p>
  
  <p>so here i need to program the specific voltage depends on my data. is it possible that i can access the output voltage of headphones in android and then create a application to control that voltage?</p>