I have a very limited knowledge however just need to read one 24V Digital signal from a controller board so was going to use a voltage divider shown below.
I have now been told however that:
“24VDC, normally we have negative output, not trigger output +24VDC, trigger 0V”
From what I understand that means that 24V is being used as Gnd and Gnd so to speak is then -24V i.e. wires reversed or am I way off?
So can I still use the voltage divider and reverse the wires from the controller to sense +5V on the Arduino Digital pins.
Also just to confirm that a voltage divider will act as a pull down on the Arduino to get 0V.
The more I read this the more my logic sounds wrong.