Connects to my volvo's LIB bus network and interfaces to the steering column buttons to control remote relays with existing car buttons and switches.
Utilizes my LIN_BUS_lib-Skuzee LIN bus decoder library.
https://github.com/Skuzee/LIN_BUS_lib-Skuzee

Pictured above is the main controller (Sparkfun promicro ATMEGA32U4) with 12v and 5v regulator circuits and LIN tranceiver.

Installed on switch mounting board.

Remote controller (Digispark ATTINY85) and 4 relay expansion board.