- 1. have the transistors activate smaller 5V relay that then activates the larger car relay. Kinda of backwards, but I think the car relay is overloading the transistor.
2. connect another sensor that would only be hooked into the controller board.
I think the first option is the easiest right now so I salvaged a 5V relay out of a blown TRS-80 motherboard from the ’80s. I had to create a new part in eagle, which was a learning experience. I’ll try to etch the board later on tonight.