Let us begin by asking what is the make and model of the garage door opener.How do the garage door sensors work? Mine have stopped working and I want to fix the problem.
I know WHAT the sensors do, but not HOW they do it. From another thread it seems there's 11 volts on the sensors at times and a 330 HZ square wave at other times. So my question is -- how do the sensors tell the opener whether the light beams are blocked or not? I suppose there's information on that square wave?The ones I have use a photo sensor.
There is a light transmitter on one side of the door near the floor and a light sensor on the other side.
It stops the door moving if anything interrupts the beam.
If the two get out of alignment, then it won't work.
There may be an indicator light on the receiver that goes on when the alignment is correct.
It just detects for the presence or absence of the square wave.how do the sensors tell the opener whether the light beams are blocked or not? I suppose there's information on that square wave?
I disconnected the wires from the opener and measured 11 volts at its terminals. I measured between the wires and they are not shorted. I replaced the wires on the opener and measured 0 volts on the sensors. It would seem that there's a broken wire somewhere in the run. My meter leads are not long enough to measure from the opener to the sensors, but I suppose I could use some hookup wire to extend the leads.It just detects for the presence or absence of the square wave.
But unless you are knowledgeable about electronics, I don't see how that will help you solve your problem.
by Robert Keim
by Duane Benson
by Aaron Carman
by Duane Benson