Do you ever wonder how garage door sensors work? In short, they transform electricity into an infrared light beam to create an invisible cable trap. This system was improved when Herbert Cady Blodgett teamed up with Johnson to create the first electric door opener. The photographic eyes located on either side of the garage door opening transfer an infrared beam formed by electricity between them. When the sensors detect an obstruction, the door stops closing automatically and reverses direction.
Smart people could use a radio to pick up the code, record it and then play it outside their garage door to open it and steal it. On January 1, 1993, the federal government passed a law requiring that any garage door installed after that date must include sensors to prevent accidents, such as closing the door when someone was standing underneath it. Garage doors protect the perimeter of your home, and garage door sensors protect you from the garage door. If your garage opening system doesn't work, you may find it helpful to troubleshoot garage door sensors first.
The sensors are usually about 4 inches above the ground and come in pairs, one for each side of the garage. If your garage door opens normally, but then doesn't close or starts to close and then reopens without any obstacles in the way, the garage door sensor is most likely not working properly. The system uses an infrared radio signal, which activates the electric motor once the button on the remote control is pressed. In turn, the electric motor is attached to a track and pulley system, which then opens or closes the garage door.
Garage door sensors work by firing an infrared beam of light through the garage entrance to the sensor on the other side. And, if your garage is full of dangerous levels of CO2, the doors will automatically open to let out CO2 and let in air fresh. Once you've fixed garage door sensors that aren't working properly, you'll want to test them to make sure they're working properly. Everyone has an eye, and those eyes are in front of each other.
Each eye must be able to “see” the other to indicate that the door closes. If they can't send that signal, the garage door will stop closing and will reverse its movement to open again. If the door refuses to close, the sensors may have stopped working. Johnson invented the first electric garage door opener in 1926 in Hartford, Indiana, it must have looked a bit magical.
Garage doors, by design, must be there for you and your family to be safe, and garage door sensors are part of the package. If the door doesn't close completely or invert instead of descending, the sensors may need a deeper adjustment.