About 10 years ago, at a previous home, I had a homemade "garage door monitor" that would tell me whether or not I closed the garage door after leaving. It wasn't pretty, but it worked well, and I liked the way it worked.
I had a 12Vdc buzzer connected to a 12Vdc wireless relay in the car. Both of these were wired to a fuse that was only hot when the ignition switch was in the "on" position. The relay was controlled by a keyfob, i.e., pressing a button on the keyfob closed the relay causing the buzzer to sound until the button was released.
I opened up the keyfob and soldered a couple of leads to the contacts such that touching the leads together simulated a button press.
I connected the keyfob leads to the dry contacts on an Elk M1G relay board. The M1G could tell when the garage door was open by way of a magnetic door sensor. I set up a M1G rule that would cycle the relay connected to the keyfob leads every two seconds while the door was open.
As soon as the door began to open, the M1G and keyfob were simulating a two second button press every four seconds (two seconds pressed, two seconds released). At this point, nothing is happening with the wireless relay or buzzer because they aren't powered up until I start the car. As soon as the car is started, the buzzer cycle starts, and continues until I back out of the garage and close the garage door (and it closes completely). The range was about 75 yards, which means there was plenty of time for the garage door to close and stop the buzzer, as long as I remembered to close the door. I knew that if the buzzing continued after I left the driveway, I forgot to close the door.
FYI... I almost never forgot to close the garage door. What usually happened (before the monitor) is I couldn't remember if I closed it, so I would turn around 100 yards down the road to go back and check.
I also know that I can check the garage door status via my iPhone, get emails, texts, notifications, etc., if the door stays open for a period of time after I leave. But I want to know before I get down the road that the door has closed, without checking my iPhone.
So is there a way to do this using Hubitat as the controller? I would especially like to replace the keyfob with something else (a little more professional) if that's possible.