I have a project with Arduino.
I just control temperature and some PLC inputs. If one of PLC connections pin status low, everthing is ok and we see a message in explorer " Everything is Fine " but if connection pin gets High we see a message “There is a problem” like this.
But I want to recreate this project with Raspberry PI 3 and node red… I can create temperature sensors node but, how can I create GPIO pins like alarm active or everything is ok.
Thanks for your helps