Garage Door Opener & Alert Project

Inspired by one of Nate's Konnected video's  ( I was inspired to integrate a Konnected DIY board to Chamberlain garage door control. While many of garage door openers use a momentary switch to activate the garage door my Chamberlain system didn't. So the initial challenge was to discover how to implement a simple momentary contact to activate the door on my system.

So I disassembled the Chamberlain Wall Mounted Mutifunction Control Panel to gain access to the PCB. Knowing the activation was a button push I located the only monetary switch on the PCB labeled (SW1). Then using my multi-meter I checked for continuity on the four (4) SW1 pins (see pic) when the switch was activated and found that the pins located diagonally across from each other closed with the switch activated. So I soldered a wire leads from a pair of pins opposite of each other and extended them outside of the door opener case.

Not knowing if the voltage or noise levels that maybe present on these leads I choose to isolate them with a normally open relay and not directly connect them to the DIY PCB. Next I used the Konnected smart app to configure the DIY PCB board pins GND, D8 as a momentary switch to activate the relay.

With hardware in hand, I strapped together the system for an initial test (see pic) and it was a success! Of course when I showed the wife she wasn't impressed. Her only meaningful comment was it looked horrible and dangerous taped to the wall. So the next step was to package it in a wife approved container. In fact, she mentioned that a travel soap container looked like it would work. So, I let my fingers do the shopping and ordered a couple of black plastic clam shell travel soap containers from Amazon. I have to say after a few mods to the container to allow for a 12VDC power plug and wiring leads from the door PCB things were looking good (see pic).

Since I intended to automate the door opening and closing with a presence sensor I wanted to add an audible alert anytime the door was activated to ensure anyone in the area was aware of the movement. So I used a Smartthing Multipurpose sensor configured as a garage door sensor and mounted on the garage door. This sensor provides the open/closed status on the door and also has accelerometer feedback. So with a couple of smart apps I now have a complete system which detects a presence sensor to activate the doors, monitors the accelerometers and activates the piezo buzzer to produce an audible alert when the door moments is detected. (see pic). 

Garage Door Control PCB






Mounted with Piezo Buzzer


Wife Approved Installation 




  • @Roman, You can purchase a NodeMCU Base to provide the required 5vdc for the relay. My recommendation on a solution is the same as I used for my system. That is to connect the Normally Open 5vdc relay to connect across the wall mounted switch to mimic the action of the switch when it is depressed. It's been working for me for over a year without any issues. Reference some of my previous posted for details. Best of luck. Greg
  • I also face the issue of garage opening in case of power outage. @Greg, di you see the same iasue with your setup? I am thinking of getting a battery from Konnected store unless there is another option.
  • @Vishal, Never had any issues with power outages activating the opener in my setup. Since my relay is acting as the momentary contact to activate the opener and its unpowered state is open a power outage doesn't trigger the relay.
  • Greg Thank you for the suggestion. I got the new v3 nodemcu with base, hooked it up my relay and now its working. I gave the 9v power to base. In my case, i am powering using the usb without base. Even though my multimeter reading shows 5v, its not triggering the relay. Once i got the base, the setup started working. I didn't need to solder wires to wall remote, i just fed it directly to garage motor like Vishal. Now both wall switch and nodemcu setup works. Its also not triggering relay on power outages. Vishal, I had similar problem like you, triggering switch on power outages, wall switch not working. Not sure if it will do the trick, but try putting the jumper in H mode instead of L mode on relay. Get atleast 9v power into nodemcu base. In your pictures, you are using the same relay as mine. Get all three connected to relays input. Play with NO and COM wires going to motor. If you need to use NC mode on relay, it will eat the voltage and your wall switch wont work.
  • @Roman. Thanks for the update. Will try it as soon as I get time.
  • @Roman. I tried high level trigger as well as changing wires on garage door opener but no luck. My wall button still doesn't work and garage door opens after power outage. Is it possible for you to share picturrs of your setup?
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