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Garage Door controller reverse function

Discussion in 'General Electronics Discussion' started by Dan_68, Apr 5, 2014.

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  1. Dan_68


    May 1, 2011
    Hi all,

    I have recently installed a garage door with a motor. My problem is i dont have a controller for the motor. I dont want to change the motor as it is very difficult to do so.
    I have bought a 2ch wireless reciever with remotes. I can connect these up no worries to control the door and i am going to wire in the limit switches to the relays to tell when the door has reach the top and bottom.
    Does any one know how the reverse function works on a normal controller, ie when it hits an object it stops or reverses. I know some have light beams but others must work on a over current reading or something.

    Any help will be appreciated.

  2. TonyS


    Jul 13, 2010
    Many years ago I brought a Sears (US) one to Europe. That had a synchronous motor with a perforated disc that chopped the light to a photo transistor. The motor ran at constant speed until the limit switches were reached. When it slowed down, because of an obstruction, a comparator circuit that measured the light pulses triggered the reverse operation. I had to fit a new disc because of the change from 60 to 50 cycles!
  3. Dan_68


    May 1, 2011
    thanks mate taken me a while to find this post again. Pretty clever system it must know to use it on the down stroke as well as you would think it would slow a bit lifting the door as the weight of the door changes the more it goes up.
  4. Gryd3


    Jun 25, 2014
    There are multiple systems you can use.
    We have a larger door at a shop that has an bladder on the bottom. When it compresses, it stops the motor. Of course, we have an up, down, and stop button so we can manually dictate which direction to move it or even stop it half way.
  5. Bluejets


    Oct 5, 2014
    Late model stuff generally senses current draw to control the motor.
  6. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    Aside from photoeyes types, there is also edge sensor (weatherstrip at bottom of door with pressure switch in it) and older style doors use a limit switch that is on the track. When excess force is applied from downward force it makes the track bar move back and trip the limit switch.
  7. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    If you have the spare parts this is doable, but if you plan on buying everything it will cost nearly twice as much as buying a new opener for $150
    If your willing to ignore the reversing function (unsafe) it can be done with 4 relays for under $50
    Last edited: Dec 5, 2014
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