My mum wanted to play some music from my desktop computer on her stereo(which doesnt have usb support but has stereo jack audio input) - and I was looking for reasons to hack stuff.
so i took old broken bluetooth headset (that my ex broke...bla bla ) and hacked it to include a stereo jack - and now she just plugs it in and plays the tunes(audio streaming) :)
1. Write a computer program to include voice control so she can just change music or switch of the computer off from her room using a voice command.
2.Hack the stereo to charge the bluetooth headset without unpluging it. (she probably wont let me do that lol )
Step 1: Schematic
This is the circuit diagram