“Frequently I will install a control system to later find out —it doesn’t work or work properly. Have you been there? My aim with this project is to find those anomalies and “gotcha’s” before the first wire is connected to anything. That is the beauty of the Arduino Mega 2560 —lots of pins and you can simply hang a LED on any pin to see if the circuit is controlling as it should. I really like that. No smokedparts!!!”