I have a 5v wire that runs from my arduino along the frame of my truck to a switch at the rear and back. I want to put a filter on the signal wire coming back just to filter out any spikes and noise that might be picked up by that wire, just to be safe. How do I pick the capacitance value to use for this sort of application?And if I wanted to filter a 12V hot line (presumably straight off the alternator) to get a cleaner 12V wire that I can later divide and use with Arduino input pin, what kind of capacitor and/or circuit would I use here?
I'd guess a coil and a cap are under $2.
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