I added a ratgdo to my garage door, and I don't know why I waited so long
Briefly

"I like to know the garage door is closed and our cars are tucked in safely. But actually looking out a window with my stupid analog eyeballs is lame, so I figured I could make things easier by adding some smarts to my garage."
"This worked great for a couple of years, until Texas summers murdered the poor Pi. So, I was back to peeking out my window to check on the garage in the evenings. Like a sucker."
"The first thing I looked at-and quickly discarded-was using my garage door opener's built-in automation functionality. My particular garage door opener is a LiftMaster, which means that it's part of a big group of garage door opener brands under the 'Chamberlain' banner."
"I had just two requirements in my search for that better way. First, whatever automation solution I settled on had to be compatible with my garage door opener. Secondly, anything I looked at needed to interoperate with Apple's HomeKit, my preferred home automation ecosystem."
Read at Ars Technica
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