Hello, I have a some hardware that controls large signal lights. I would like to use an opto isolator or something similar to connect to the pie’s GOIO to be able to know when the signal lights are on. The hardware drives up to 10 signal lights, so I would like to have 10 GPIO inputs. Can anyone recommend some hardware to assist in this?
Basic goal is for the pie to know when each of these signals is on or off.