Hi,
I'm creating a custom wheel for the Logitech G29.
I've seen many projects on youtube, but everybody uses the stock wheel buttons or an external cable to use the buttons.
But I don't want that...
I disassembled the wheel and I "reverse engineered" the connector:
2 pins carry 5V and GND
2 other pins are for the revs leds (but i don't care about them)
1 pin for shift/load
1 pin for clock
1 pin for serial out
I found them by searching online for the datasheets of the HC165 parallel-load shift registers on the pcb.
Now, based on that information, what I want to do is to emulate the behavior of the HC165 so that I can connect an arduino (or similars) to the connector to use other buttons.
p.s. I don't know if I put this in the right category so tell me if I'm wrong
I actually haven't got any HC165, so I would have to order them if I want to use them. And emulating it can be also useful if I want to change the buttons mapping with software, without de soldering the wires. I know that I can also map them using the wheel's app on the pc, but I prefer to have control of it with my program, since I will also have to connect a display.
p.s. I won't use an Arduino but a raspberry pi zero 2 so that I can use wi-fi to get the game's information and I can use a 3.5 inch display.
The problem with emulation is speed. If the host software expects an HC165 connected, it may (or may not) expect response times in the sub microseconds. Arduino I/O pins can't always be addressed quickly enough. You have to probe with a scope or logic analyzer to find the timings.