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Very nice writeup.
Instead of using that garage door sensor, you could use InControl (the 2nd link you posted here) to automatically turn off the relay after 3 seconds. That’s a quick and easy way to take care of the problem of with the relay staying on.
Thanks for the compliment! Hopefully it helped you in some way.
I don’t have InControl, my receiving device is a 2Gig control panel which is monitored through alarm.com via cellular device. Unfortunately alarm.com does not offer that advanced functionality, I’m sure the 2Gig panel would/does except once you switch to active monitoring, you have to change everything through the alarm.com site. For those who have InControl, what you said should work fine. In my situation though, I had to come up with a solution that would trigger another rule, that could be used to turn back off the relay.
Fantastic writeup. just what I was looking for!
Now that I’ve followed the links you posted and gotten up to speed on this, I have a question: By using a contact sensor as the trigger for turning the LFM-20 relay back off it seems like the LFM-20 relay circuit would open right away when the garage door is opened, but when the garage door is closed the circuit would remain closed the entire duration of the garage door’s traversal, correct? From the comments it sounds like this means your garage door buttons and remotes won’t work while the door is being closed (when triggered by the LFM-20 anyways). Also, couldn’t the LFM-20 get stuck “On” if it was triggered while the garage door was already in the process of closing?
Would it make sense to add a second contact sensor that is in contact when the garage door is fully open? It seems like doing that could eliminate most scenarios where the LFM-20 was left “On” for any length of time.
Anyways, thanks for doing such a fantastic job documenting your project. It gave me a starting point to try this myself.
You press the button once on your phone (how I control mine), which activates the relay and opens the garage door. There’s a sensor that triggers as OPEN as soon as the garage door lifts, which shuts OFF the relay.
Press the button again, the garage door will start to close, and once the sensor triggers as CLOSED it will shut off the relay.
Both open and closed status of the garage door sensor are setup to send a “shut off” command to the relay.
To answer your question though, I haven’t had any issues with it being stuck on, no.
And keep in mind our car garage door openers/clickers still work all the same.
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