I have two 120v coil relays with NO & NC contacts. How do I program it to read the dry contacts when they are open and closed using pin 11 & 12? Can a ground signal be used to trigger it and if so how do I do this? I tried the 5v with a 330 resistor and ground
but no luck.
Yes, connect the NO terminal to one Arduino pin and the COM terminal to the Arduino's ground. Then set the pin to INPUT_PULLUP mode. You can then read if the contacts are open or closed with digitalRead().
I am new at this and as you can see, Would you happen to have an example of this?
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I was describing the way that button S3 is connected in the schematic posted by @paulpaulson.
Thank you and I will give it a shot.
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