+ Reply to Thread
Results 1 to 17 of 17
  1. #1
    Registered Member
    Location
    , TX, United States
    Member No: 9064 ericfullerton is on a distinguished road ericfullerton's Avatar
    Join Date
    Apr 2001
    Posts
    5,936
    Rep Power
    21


    Yes | No

    ot: how to bypass electric eye on a liftmaster

    How can I bypass electric eye on a liftmaster garage door opener? I think I've tried every combination of open and twisted together on the sensor wires, but it still goes up while closing if you release the button. The only way to keep it down is to catch it completely down and release & punch the button quick. that usually takes a couple of tries. Surely someone here has experience on this
    Please spare me the lectures on safety, there are no children to kill and this is on a greenhouse, no remotes will be used, the buttons will be mounted high.


  2. #2
    bevo
    Guest
    Location
    , ,
    Member No: bevo's Avatar


    Yes | No

    And now for the lecture on safety.................

    Do you have schematic? How many wires to sensor? Can you just move it to where it is just looking at itself and perhaps only preventing someone from inadvertently tipping over a rake while an innocent child gets CRUSHED! =)

  3. #3
    Registered Member
    Location
    , TX, United States
    Member No: 9064 ericfullerton is on a distinguished road ericfullerton's Avatar
    Join Date
    Apr 2001
    Posts
    5,936
    Rep Power
    21


    Yes | No

    It is easier and more fun to get another kid

    No, no schematic. 4 wires two to each sensor. I may ahve found a solution, if the problem is incompatability with the present sensors (which are of unknown brand) which I suspect, I have found a set that are a match. Usually, however you can somehow defeat any safety system. I suspect the circuit expects a certain impedance so neither open nor closed will get it. Again though, it isn't like it is ever going to be operated by by anyone other than sober adults.

  4. #4
    Registered Member
    Location
    wayzata, MN, United States
    Member No: 32270 unkorama is an unknown quantity at this point unkorama's Avatar
    Join Date
    Apr 2002
    Posts
    7,948
    Rep Power
    0


    Yes | No

    heres what i did

    MOUNT THE ELECTRIC EYES UP TOP ON THE METAL BRACING THATS HOLDING THE OPENER TO THE CEILING. JUST HAVE THEM FACE EACH OTHER COMPLETING THE CIRCUIT. THE ONLY THING YOU MAY EXPERIENCE IS IF YOURE CLOSING THE DOOR AND EITHER TURN THE LIGHTS ON OR OFF WHILE THE DOORS IN MOTION IT SOMETIMES TRIPS IT AND STOPS THE DOOR. IT ONLY DOES THIS WHEN I HAVE MY BIG FLOURESCENTS ON THO. INCANDESCENT LIGHT DOESNT EFFECT THEM

  5. #5
    Registered Member
    Location
    Oak Ridge, NJ, United States
    Member No: 35336 E30 is an unknown quantity at this point E30's Avatar
    Join Date
    May 2002
    Posts
    8,842
    Rep Power
    0


    Yes | No

    Re: And now for the lecture on safety.................

    I saw a cat stuck under a garage door. I guess they didn't have the sensors hooked up :-)

  6. #6
    Registered Member
    Location
    , TX, United States
    Member No: 9064 ericfullerton is on a distinguished road ericfullerton's Avatar
    Join Date
    Apr 2001
    Posts
    5,936
    Rep Power
    21


    Yes | No

    Slow cat

    Probably helped to clean up the cat gene pool.

  7. #7
    bevo
    Guest
    Location
    , ,
    Member No: bevo's Avatar


    Yes | No

    Lol...My boss just called me to tell me he had to

    run over to his neighbor's house to try to lift the door off her kid that just got its legs caught under it. Sounds like their sensor is mounted too high since the kid was just outside spinning around on a Sit-n-spin. Kid is ok, but mother is all wild eyed now.

  8. #8
    bevo
    Guest
    Location
    , ,
    Member No: bevo's Avatar


    Yes | No

    Appear to be photodiodes, so it is a leaky current

    circuit with current sensor in unit. You would have to figure out what it expects to see and put in comparable resistor on the receiver wire pair. Get out your tacometer and series it in with the pair that is connected to the receiver end to find out current. Then find out voltage across the leads. Ohm's law tells you the rest.

  9. #9
    Registered Member
    Location
    , TX, United States
    Member No: 9064 ericfullerton is on a distinguished road ericfullerton's Avatar
    Join Date
    Apr 2001
    Posts
    5,936
    Rep Power
    21


    Yes | No

    That would work, thanks Bevo


  10. #10
    Registered Member
    Location
    Oak Ridge, NJ, United States
    Member No: 35336 E30 is an unknown quantity at this point E30's Avatar
    Join Date
    May 2002
    Posts
    8,842
    Rep Power
    0


    Yes | No

    The cat actually lived for another 12 years

    he just sat there until someone opened the door.

  11. #11
    ProPhotog
    Guest
    Location
    , ,
    Member No: ProPhotog's Avatar


    Yes | No

    What I did was face them together right at the

    opener motor, black-taped them together so the beam always hits then zip tied them on the motor. ugly but effective. of course, this was before I upgraded to a small mobile home.

  12. #12
    coy
    Guest
    Location
    , ,
    Member No: coy's Avatar


    Yes | No

    Re: ot: how to bypass electric eye on a liftmaster

    what i did was took the eyes and taped them together so that the laser was connected and mounted them above the motor

  13. #13
    Geez Tech
    Guest
    Location
    , ,
    Member No: Geez Tech's Avatar


    Yes | No

    Torch didn


  14. #14
    Geez Tech
    Guest
    Location
    , ,
    Member No: Geez Tech's Avatar


    Yes | No

    A torch didnt take the cat out ???


  15. #15
    Jack
    Guest
    Location
    , ,
    Member No: Jack's Avatar


    Yes | No

    Re: Appear to be photodiodes, so it is a leaky current

    throw a variable resister on the recvr pair. try a 1K pot to start with

  16. #16
    Geez Tech
    Guest
    Location
    , ,
    Member No: Geez Tech's Avatar


    Yes | No

    It is probably already fixed......................

    ....AFTER ALMOST 5 YEARS.



  17. #17
    Mike Petersen
    Guest
    Location
    , ,
    Member No: Mike Petersen's Avatar


    Yes | No

    Almost impossible to bypass

    Need a pulse signal of specific character. No combination of wires or resistors will simply bypass it. See video. http://youtu.be/GbmufXgpl14.
    Reply With Quote Reply With Quote 173.23.102.112

+ Reply to Thread


Thread Information

Users Browsing this Thread

There are currently 2 users browsing this thread. (0 members and 2 guests)

     

Bookmarks

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
1e2 Forum