I'll also be using two HC-SR04 sonar-based proximity sensors to doubly confirm that the car is actually where it says it is, as I'm also including the ability for the garage door to close once the vehicle is in place, so the GPS is just initial location data to start firing the proximity sensors.
A HC-SR501 PIR sensor will sense motion which will start monitoring GPS for proximity to its proper place in the garage. Once it's within the desired range (2 metres or so), it'll fire the sonar sensors to ensure it's inside the garage so the door can shut. If it's just someone in the garage and the car isn't anywhere near the house, we stop doing all work.
I'm using a Raspberry Pi Zero for the backend API logic which will communicate to a Wemos D1 mini over bluetooth in the garage which will automate the garage door, display the charge level via LED strip, and sound the audible "PLUG IN YOUR DAMNED CAR" warning if battery percent is lower than my desired level.
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