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  • Franju

    Member
    January 24, 2021 at 11:06 pm

    Hello,

    What about to try doing contact to the input with a cable connected to 12v, and after connected to 0V, and check if the eratic state of the input is gone ? If so, it would mean, I think, that you need a pullup or pulldown resistor, depending to your project.
    Or maybe a switch connected for exemple NC to 12v and NO to 0V ?

    • This reply was modified 3 years, 11 months ago by  Franju. Reason: orthographe

  • Franju

    Member
    January 29, 2021 at 6:21 pm

    I think you can have a look on the Atmega 2650 microcontroller datasheet, as it is the one used in controllino Mega.
    Still my opinion : the internal pullup resistance would be those of the Atmega. So its datasheet would tell you. And so there is no internal pulldown resistors.

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