Detecting if my car is parked in the "right" spot

Sounds like a plan.
You could get away with just using a simple relay, so unless you want to control or track the status from home assistant it doesn’t necessarily need to be ESP-compatible.
I can definitely think of some uses in home assistant, just make sure the light is triggered by the relay or microcontroller itself to prevent latency.

Oldie but Goldie :trophy:

For your use case you probably need to adapt the setup a bit

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I’ll go for this option. Indeed not ESP-compatible, but covers the user requirement. I could still decide to extend the solution to ESP, if I want to trigger more complex action in HA.

Thanks!