[Viktor] is working on salvaging parts from a dead laptop. In his eyes the biggest gem to be had is the touchpad, so he set out to see if he could make the touchpad a standalone device. You might be envisioning the many hells of interfacing this with a microcontroller and writing firmware to measure and translate the input to HID compatible commands. The good news is it’s quite a bit simpler than that, with just one gotcha.
He looked around to see what he could find about the chip that drives the touchpad. He couldn’t locate an exact match, but a datasheet from a similar family of controllers make him think that there should be a PS/2 data and clock output from the chip. After probing the test points on the board he found them, as well as the voltage and ground rails. Above you can see he soldered an old mouse cable to the board and it works when plugged in.
But we did mention the gotcha. There doesn’t seem to be any support for the right and left buttons. Those were housed on a flexible PCB which attached to the white connector seen above. That PCB also connected to the computer so we don’t know if they will work with this hack or not.
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