I am working on a moderately silly project to control the heater fan speed on my Volvo with an arduino.
I have the arduino sending a PW to a MOSFET that then (and this is where I get stuck)
1. control the hot side of the circuit. It seems like the safest to me. *or*
2. control the ground side of the circuit. but then the wire is "always" energized. Seems slightly less safe. But I could also do something or another with the ground to make sure that the fan is actually drawing current...
Thoughts? Suggestions? Is that as clear as mud?
Thanks!
Andrew
I have the arduino sending a PW to a MOSFET that then (and this is where I get stuck)
1. control the hot side of the circuit. It seems like the safest to me. *or*
2. control the ground side of the circuit. but then the wire is "always" energized. Seems slightly less safe. But I could also do something or another with the ground to make sure that the fan is actually drawing current...
Thoughts? Suggestions? Is that as clear as mud?
Thanks!
Andrew