Following the tips and advice from others in this discussion, I created my own Zigbee Garage Door Opener Device. I started by using a spare remote control for my Chamberlain MyQ garage door opener. I pulled out the circuit board as shown below:
Next, I purchase a Zigbee Relay Board from Amazon for $15 US.
This board paired very easily with my HE hub. I configured this relay board to be in "inching" mode, which acts as a momentary relay switch (you turn it on, and 1 second later it turns off automatically). So the plan is to activate the push button on the garage remote control circuit board.
Next, I soldered two wires on the garage remote circuit board across the leads to the push button. Then, I inserted those leads in the Zigbee board's relay COM (Common) and NO (Normally Open) connections.
I then used some plastic electrical standoffs to position the remote control board on top of the relay board. Makes it very tidy.
Finally, I plugged in a micro USB cable into the relay board and put everything in a small electronic kit box, with the USB cable sticking out a hole in the box. I then velcroed this box under my office desk (where I've hidden a lot of my electrical devices) and plugged it into a USB adapter for power.
I can then turn on the switch for the relay device from my Hubitat Dashboard to activate the garage remote control. To make it even easier for me to trigger, I use the Android app called Macrodroid to trigger this device thru an HTTP request (using HE's Maker API) from my Galaxy Watch on my wrist. Really cool setup, thanks to all the great ideas and advice in this forum!
