Yes, you could implement geofencing with that, switching the camera would be no problem. Generally you can just switch the +V BAT wire to the dashcam hardwire kit, leaving the ACC and GND connected.I was thinking that a simple Arduino + GPS could turn the cam off when at home. Sounds like it would only need to interrupt power until the car is started again, and then turn the hardwired power back on.
Very good.I wouldn't use a relay, I'd have a latching MOSFET circuit that came on with accessory power and was held on by the Arduino until the GPS detected being at home, or probably some sort of time-out too.
You just made Pee-Wee's Breakfast Machine. lolThis is what I had in mind:
View attachment 71928
The switch on the left is accessory power, the switch on the right is the Arduino. The 12V at the top is hardwired.
You can see that only nano amps flows when off. The accessory power turns the circuit on, and the Arduino holds it on. The logic is pretty simple when you think about it:
View attachment 71930
Basically just wait until the car has been at home for 5 minutes with the ACC power off, or the battery is low, and then turn off. I'd probably want an override switch for long term parking too.
Why not press the power button?