Actually not arduino related but i bet this is a good place to ask …
I’m looking for a small 12V DC powered relay that takes a small voltage ±1 volt to trigger on and make one simple wire connection with adjustable return delay.
I want to try if i can make an rpm limiter by using the red led (max rpm warning) on a digital tachometer to kill the spark (ground the spark coil) in order to make over-revving the engine impossible.
Possible with a adjustable delay so it takes some time for one to rev the engine back up again.
Project is a gokart with a briggs engine.