since the tablet will be within a frame, we won’t have access to the hard keys.
so i came up with a solution of controling the tablet with wires interface, using the CD4066BE chip, activated by capacitive sensores (AKA capsense)
read on CD4066BE: http://car-android.com/research-6-cd4066be-quad-bilateral-switch/
read on capsense: http://playground.arduino.cc//Main/CapacitiveSensor?from=Main.CapSense
so, i opened up the tablet and solder all the hard keys terminals. (and in this tablet it was sooo easy since it had a big side by side 5 terminal points for the hard keys..)
the green wire need to be connected to the positive side of reset button.
that it.. easy, we done- add some female header to the wires..
it works like that:
screen on/off – connect BLUE + BLACK
for shut down – connect GREEN+BLACK
volume down – connect WHITE+GRAY
volume up – connect PURPLE + GRAY
so we got 6 wire to manipulate: black, white, gray, purple, blue, green.
we will control the tablet using the CD4066BE chip controlled by ATMEGA328 IC.