I needed key-less way to open my garage door. Quite often I forgot my remote, so just need something easy to open them without remote. Because I have regular “ring type” opener (click and release to open door) needed something to “click” door for me based on something which I remember (not own – remote / key / etc).
Basic idea – keypad + arduino + relay to click the button.
Source code is pretty simple. Read input from the keypad, check if it’s matched against 1, or second 2. If so – just fire signal to open relay for 3 or 30 seconds (second one is for other door).