I’d like to build a project using an Arduino to control a pair of auto cooling fans. The fans are two speed and activate at the same time. So what I need to do is read coolant temperature and at a certain temp switch on the 60amp relay that turns on the low speed circuit. At a temperature of about 20 degrees above that, I want to switch off the low speed relay and switch on the high speed relay, then switch back from high to low when the temp drops. And of course, shut off at the initial start up temp.
After I get the above functionality figured out I’d like to experiment with running the fans for a period of time after the engine is shut down, but that’s not a priority. And of course I need to protect the Arduino from the vehicle’s electrical system and all it’s vagaries. Adding things like LED’s to indicate fan operation, or even an LCD to indicate temperature might be fun too.
I’ve got computer programming experience but no Arduino experience. I’m willing to start small with a project kit and learn on small experiments. There’s nothing urgent, the vehicle (a Jeep CJ-7) is running now on the relays and simple on/off temp sensor and just the low speed circuit).
Any advice is welcome, including on which Arduino or kit to start with and any simple starter projects that would help me learn and build up to the main project.