Sending Data through Headphone jack in Android phones

Question

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.

so here i need to progra

Answer 1

I believe you will have to dive deep into Assembly type language, however, why the headphone jack? As I understand it, only reverberations and sound are transmittable through the headphone jack. I believe it would be more feasiable to output voltage through the Mini-USB port.

I think this site may be of some help regarding my method:

http://pinouts.ru/Slots/USB_pinout.shtml