LiftMaster 8500W Button - How to hack into it to add another simple doorbell contact switch?

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I want to open and close the garage door via a simple doorbell type contact switch. Unfortunately, my LiftMaster 8500W with the hub capability to operate with the myQ app, while it works fine with that, the wiring for the manual garage door button is more complex. It's not a simple doorbell type switch. I do not know if there's a way to hack into the switch to trigger an open or close with a simple doorbell type contact switch. Even the secondary button I had them install which looks superficially like a small lighted doorbell button is similarly proprietary.

Still, has anyone found a way to get into the switch to trigger a closure with a simple contact switch?
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Mitchell Gossman

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Posted 2 weeks ago

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gryhnd

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With all of their security protocols running the wires you can't use a simple contact switch.

Easier to get their $11 compatible push button.
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Mitchell Gossman

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Yes I have two of those. My project requires a simple button to hack into to home-brew a remote trigger.
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gryhnd

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Then you need to remove the circuit board from the push button and solder on leads to the micro switch contacts.  This is what I do for my Alexa controlled work around for my 8550. Pull up the full size pic at my write up over here.
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Mitchell Gossman

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Good thought, there must be a simple contact switch inside there someplace. I'll check out your writeup.

My garage door installer put in the buttons. I have two of the mother ship controllers one for each door, and a small button at the other side of the garage for each of the doors. I'd hate to wreck the existing button in the endeavor, I wonder if you can have three buttons on the same garage.

I have to admit I'm a little worried about using the Insteon controller which I already own, see below, for fear of phantom openings. Same thing for the wifi switches.
It should be possible to control the switch using the alexa, I could use IFTTT to deliver a command to my Universal Devices ISY99i controller. I use that to turn on my lights when I drive into proximity of the house.

https://www.insteon.com/io-module/ 


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gryhnd

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Can't speak to the Insteon but I' e never had a phantom opening with my setup :) And if I did it would most likely be attributed to a failure of the Chamberlain switch, and not a result of the IOT device.