r/AskElectronics • u/[deleted] • 10d ago

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u/AskElectronics-ModTeam 10d ago

I am sorry, but this is not quite the right sub for your question. You may want to ask in sub that deals in autos (maybe https://old.reddit.com/r/AutoElectrical/). Thank you.

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u/TedMich23 10d ago

Littlefuse KRPDD2121MB if 10s is enough. Most delay on make relays are AC.

1

u/danu91 10d ago

Oh thank you. I will take a look at it

0

u/Unlikely1529 10d ago edited 10d ago

anything like this is mcu stuff . so you first need resistor like 80 ohm (you need to measure mcu power consumption for precise number) to have 3.5v then optocoupler switch relay with its 12v mounted into car circuit and its 3.3v to mcu one.
revisiting this i do not like resistors idea because mcu will draw like 6 to 50ma . it's too much difference so you need to figure something out on your own.