Well, I have a creative zen sleek and i would really love to control this ala the ipod remote http://www.maushammer.com/systems/ipod-remote/ipod-remote.html using a pic micro.
So i opened up the zen remote that i whipped off my brother and stuck a scope on the blue and black wires inside. red and white wires appear to be for the audio connector
Blue seems to be the data wire and black is ground
The zen sleek remote protocol is nothing like the ipod - it doesnt use a uart/pic at all. Rather it must use the ADC of the sigmatel chip inside and software parses it to see what button has been pressed.
The buttons and their voltages are :
sw3 -2.05v
sw4 -1.45v
sw5 -1.1v
sw6 -900mV
sw7 -700mv
sidebutton -1.75v
that seems wierd to me that you'd input a "minus voltage" to actually toggle something in he adc. But either that or the blue was was ground instead of black which i severly doubt since i buzzed out the black wire with my multimeter and it seems to be going to all the groundy type places.
So last night i also put together a piece of circuitry on my breadboard for my pic 16f627. This pic doesnt exactly have a dac but it has a voltage divided that can be used instead, so i'll put some code together for that afterwards using my warp13a programmer (that never worked for me before - but seems to work now!)
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