@MorganS - My garage door wall buttons are 24V AC. The troubleshooting manual shows that, in event the door does not open, to place a wire across two terminals at the wall button (to short it?). If the garage door works, the issue is with the garage door wall unit, not the opener itself. I thought I could use a microcontroller to create that "short" and therefor have another way to control the opener. But I am dealing with 24V AC. Interestingly, pressing the door button sends the circuit voltage to 0 (a "short"?). The light button send the voltage to 12V and the security button to 6 volts. If I knew how, I could probably control all three with Arduino I bet.
@Lastchancename - You're right I'm sure, but this is a learning experience for me. I am going back to my childhood; putting together one of those Radio Shack transistor radio kits. Yes, I could buy a radio, but what fun is that? What is learned? I could buy a decently designed PCB relay too. This project is about exploring and ultimately it is going to refill my fountain when the water level gets low. A weather-tight electrical box is just next to it. If lightning strikes that, I will have issues to be sure!