I'm trying to simulate the pressing of a button after starting a car. The button is a momentary button that just shorts the input wire to ground. The input wire seems to be floating, I've measured 3-6v on this but being automotive maybe this could get as high as 14? Being more of a software person I initially thought of using a microcontroller and writing a program to detect the power on, wait and pull an output low and somehow use this to pull the actual input wire low. I think this might be over complicating the problem.
How simple of a circuit could be used to use the 12v ignition feed to power a circuit to pull this signal wire to ground for say 3 seconds (this isn't critical) and then leave it in it's original 'floating' condition which would allow the actual physical switch to be used if needed?
Thanks.
How simple of a circuit could be used to use the 12v ignition feed to power a circuit to pull this signal wire to ground for say 3 seconds (this isn't critical) and then leave it in it's original 'floating' condition which would allow the actual physical switch to be used if needed?
Thanks.