He had tried wireless garage door keypads in the past ... nearly all he needed to interface his iPhone with his garage door opener. The microcontroller has enough GPIO pins to control the garage ...

Always begin by testing the rest of the system to determine if the issue lies with the keypad itself or some other component ...

Look on the automatic garage door opener housing for a button ... Because the garage door keypad has exposure to moisture and blowing dust outside your home, the unit can struggle with stuck ...