To control multimedia (next/prev. song, volume up/down and etc.) there are 2 wires:
KEY (12v) and GND, to control i need resistance between KEY AND GND.
example if between KEY and GND i put 220 ohm resistor for second then multimedia switch song if 440 ohm then volume up and etc…
I have arduino leonardo (5v) i power it with simple phone charcger via usb.
Now i need idea how to control multimedia, how to make different resistance between KEY and GND wires?
I don’t care what resistance must be because multimedia have function to change it to what i want.
it is possible to make it with digital pot, like mcp41xxx? ( really i dont know much about it, just googled it :D)
sorry for my english.