I want to create a push button car starter that is arduino (3v) based. I want to try to keep it compact and solid state. I was wondering if i am on the right track with the following components: there are 3 states to the starter. Acc, Run and Crank/start
i was thinking about getting the following: Optoisolator - 4 Channel https://www.sparkfun.com/products/784
N-Channel MOSFET 60V 30A https://www.sparkfun.com/products/10213
i'd heat sink the crank mosfet as this will probably be a high current draw. One question, can i double up on the mosfet to increase the current handling (being able to switch 60 amps?)
if that wouldn't work, would you suggest using a Darlington Driver (8-Channel ULN2803) instead of the n-channel mosfets and having that switch 3 automotive relays?
Darlington Driver 8-Channel ULN2803: https://www.sparkfun.com/products/312
thanks in advance