Noob here, please be gentle.
I am attempting to find a solution to replace 2 very thick cables for wires, 27 wires in total, due to space constraints for my lightbar install (volunteer fireman). These are simply 12v+ trigger wires that control the different functions of the lightbar. Each wire needs less than 1 amp 12v+. The lightbar will have plenty of 12v power available inside it.
I am wondering if I can rig a simple (relatively) system of 1or 2 arduinos to pass the 12v signals from inside the cab of my truck to the lightbar, and activate a relay bank inside the lightbar itself using a much smaller USB or cat5 size wire for communication.
I’ve read a little about I2C, and have differing reports on the distance it can go, some say 1 meter, others much more.
Hoping someone can point me in the right direction.