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INPUT_PULLUP not supported?
updated 11 months, 3 weeks ago
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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
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Do guys have video off ow hit work? -
Just in case anyone ends up here 4 years later:
Just wire the button with one wire to +12VDC(or +24dc) and the other wire to the input, such as A0. It will be low when the button is open, and high when the button is closed.
It only seems to support pulldown, or active high buttons unless you want to mess with an external resistor. This is not the common way to wire a button to an Arduino, but it seems to work great!
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