Is it possible to use dry contact door sensors with the Opta? If so, how do I connect the two wires? Ideally I want to connect 8 door sensors to this Opta and be able to read the status.
On the Arduino Nano I connect one wire to the digital input pin and one wire to ground. I get 3.3V at the pins when using the multimeter and the digitalRead works fine to sense if it is open or closed.
On the Arduino Opta I get 0.0V at I1 - I8 with USB-C connected or with a 12VDC power supply connected so obviously I'm not understanding how this device is different.
I made the mistake of using the Arduino Education PLC Starter Kit and thinking I understood how it worked. It has switches 1-8 and a power supply that you daisy chain to the Opta. I wired switch 8 to the Opta I8 input and have a program that reports whether it is on or off. When I read I8 with the multimeter in this configuration I get 0.0V when the switch is off and 7.7V when the switch is on.
Thank you. That works. To make sure I'm on the right track, is the preferred deployment to wire the power supply to the Opta and then connect the Opta's + terminal to DIN rail terminal blocks along with one wire of each of the door sensors while the other wire is connected to I1- I8?
