Garage Door Opener & Alert Project

Inspired by one of Nate's Konnected video's  (https://youtu.be/nlv3w3IvJ44) 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

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Prototype

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Packaging 

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Mounted with Piezo Buzzer

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Wife Approved Installation 

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  • Haha, not surprised at the wife's response. At least she didn't say "It worked fine before you took it apart."


    Nice looking, clean install in the end. Kudos!

    I am working on a similar setup with my garage doors. I have about $50 in credit to Ponoko that I'm going to use and have them laser cut an enclosure for me and I am going to mount it near the opener.


    Have you noticed any excess heat in your enclosure?  Those open pins on the DIY Konnected look pretty bare.

  • Great point on the temperature. Given I live in Texas and the summer temps can exceed 100 Deg F. 

    As a point of reference I just measured the temperature with a infrared thermometer. 


    Outside Air Temp: 68 °F

    Garage Wall: 72 °F

    Black Enclosure: 76 °F

    DIY ESP8266 Processor Inside Enclosure: 86 °

    DIY ESP8266 Processor In Ambient Air: 84 °F


    Given the delta temperature inside and enclosure and outside is only 2 °F it doesn't appear the enclosure has any significant impact. 


    When the ambient air temperature reaches 100 °F which is 32 °F higher then today's temperature then add that 32 °F to the 86 °F to get a 118 °F or approximately 48 °C. 


    If I recall correctly, most commercial grade electronics operating temperature limits are  from 0 °C to 70 °C which means the worst case temperature (48 °C) is only ~70% of rated temperature (70 °C).


    -Cheers




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