I want to hack a device, change the function of it. I’ve found a wire I want to cut, and insert an AVR-chip (maybe an attiny85) to change the signal. But I don’t know how to connect the chip.
The wire can either do nothing, have 1.5V in one direction, or have 1.5V in the other direction. I need to be able to read this, and I need to be able to generate another signal with the same 3 variations. If it’s any help, I don’t care about polarity when reading, but I need to be able to write both polarities.
I don’t really know where to start, I’m still very new to electronics.