I am working on a custom wheel to the Logitech G27, and in order to keep using it inside hardware to get the leds information of the RPM counter and still use its buttons, I am debugging the board that is between the wheel and it shaft.
The board consist simply of a HC595AG and a 74HC165, the HC595AG to drive the leds and the 74HC165 to read it buttons, my goal is to not use this board and put an Arduino in it place.
My first objective is to read the data that should go to HC595AG and process on the arduino, so I can drive other leds the way I want, but no matter what I try I can't read the data. Can someone help me on this?
I read and draw the schematic of the board, it can be seen here: G27_crack - EasyEDA open source hardware lab
I was abble to drive the board by it on with an Arduino and shiftout code, as normally with any 74HC595 IC.