Activity Forums Questions & Troubleshooting Software & Firmware INPUT_PULLUP not supported?

  • INPUT_PULLUP not supported?

     aua90 updated 2 years, 1 month ago 3 Members · 3 Posts
  • danny

    Member
    March 19, 2019 at 10:52 pm

    I posted on the GitHub site but I realize it should have probably gone here:

    I have a prototype that I built with a standard Arduino and I’m trying to adapt it to Controllino. The devices I am interfacing with signal LOW, so unifying the supply ground for my Arduino and the device allows me to use INPUT_PULLUP on the input pins to use Arduino’s internal pullup resistors. Then I simply read the LOW signal directly. If what I see is correct the Controllino has an internal PULLDOWN resistor, that prevents the use of INPUT_PULLUP which is unfortunate because that would then require an additional external relay to basically change the LOW signals into HIGH signals. Am I missing something or is there another way to gather LOW signals directly?

  • mr-controllino

    Administrator
    March 20, 2019 at 7:56 am

    Hello Danny,

    Yes the screw terminal Inputs are all forced to ground by the voltage divider.

    If you need a screw terminal input to be pulled up … you can us an external pullup resistor … 10k for example.

    If you need a 5V pin … I would recommend to use one of the not used communication pins like I2C, RX/TX 2, /SS, … or also the digital outputs D0, D1, Dx (of course the screw output will then switch accordingly, but if you don’t use it, it does not matter) … these pins are not tied to GND and you can use the internal Pullup.

    regards

    Marco

  • aua90

    Member
    May 23, 2019 at 10:03 am

    Do guys have video off ow hit work?

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