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Detect car +12v using Arduino

Discussion in 'Microcontrollers, Programming and IoT' started by StealthRT, Jun 24, 2013.

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  1. StealthRT


    Sep 4, 2010
    I am looking to detect +12v from a car wire using an Arduino.

    I have found the following schematic:

    I know how crazy automotive voltage can get so i just want to make sure the schematic i found above will accommodate the crazy random currents that the car could produce.

    Also, wouldnt i need some type of heatsink taken that i am stepping down a +12v to 5v or less? That, in my mind, would produce a pretty good amount of heat?
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    It shouldn't produce any appreciable amount of heat and you should be able to increase the 1k resistor to 47k without a problem.
  3. StealthRT


    Sep 4, 2010
    I got my answer in another post:
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