Hacking the Mp3 Player With Arduino

Adding audio to your project is Much easy If you have a Cheap mp3 Player and few Opto Couplers and Arduino to drive them,...

Here i used the pc817 Optocouplers and 330 Ohms resistors to Drive the optocoupler from arduino Ouput pin...
and second input to Gnd of arduino.. Opto Coupler Outputs to the inner and Output Surfaces of the Each Switch... Then You are Good to go..
It is good to Add a Single or Two audio files.. But if you wanted to have more Control Go for Mp3 shield.