The main garage door sensor that most people have trouble with is the sensor that monitors the threshold. These are typically light-based sensors -- older ones used a simple light bulb, newer ones ...

The Roost Smart Garage Door Sensor, unveiled at CES 2018, will let you know if the door is open or closed. It just can't do anything about it.

Chamberlain's Wi-Fi Garage Door Opener takes confidence to deploy, ... Other pieces of the puzzle include a pair of infrared sensors that have to be wired to the main motor housing.