I just want to update everyone here that over the weekend moved the garage door solution using Arduino to support 3 buttons.
In the past, I have made an Environment Sensor that is in the form of Arduino UNO shield.
I soldered an Garage door remote to Arduino shield prototype board.
The last parts needed is an Arduino UNO. Just FYI, I am using a clone with WAVGAT brand. This looked like Arduino UNO R3. It is not exactly the same. The WAVGAT run on 3.3V (not 5V).
Here is how it look like stacked together.
Here is a short video clicking the button 3.
The Arduino is overkill just to help pressing the button. There are many GPIO ports that is still free to use. I am also planning to add more and more sensor to it. I have a motion sensor connected to it and AC power detection to it.
Thanks
Iman