I have a generic car audio head unit which allows for reading of the steering wheel control buttons and mapping them to the unit, the only problem is there is a wire which requires 3.3 volts to make it run, but finding a wire like this in the car is near impossible.
So does anyone know an easy way to regulate the ~13.8 volts to step down to 3.3 volts?
Get an LM2941 automotive rated adjustable regulator then set it up for 3.3 volts.The auto electrical system is a nightmare noise and transient wise. The LM part is made to survive that.