I’m using a 24 VDC supply with the following setup and loop to test why another (more complex) program isn’t working.
With nothing attached, I read about 10.5V on D0, 24V on D1, and 10.5V on D2. As I understand a LOW should read 7.2V max with a 24V supply. The input I could see floating.
If I jumper D1 to D0, they both read 24V (but the D0 indicator LED on the unit doesn’t light up). If I jumper D2 to D0, they both read 20V. Same if I replace the jumper with a 33k Resistor.
There’s something simple I’m missing, right?