@SkyWhisperer - Yeah, but I don’t think that would cover every scenario. I believe the object would need to be near the garage door bottom to trip the sensor. If you had something which did not protrude out of the bottom (like a broom through the back window, maybe) then I don’t think it would trip.
Personally, I wish they had a sensor that would detect when your car is backing up if the garage door is down. In my old house, I had the garage door half way down and then I backed up – bang, I made a big dent in the garage door.
Nothing tripped; the door didn’t rise to get out of my way. I just had forgotten that it was half way down. There’s no technology to fix dumb I guess.