GPS-RTK based autonomous lawn mower
The idea is to use the NEO-M8P-2 GPS-RTK module from uBlox to control a lawn mower. This device is spec'd to 25mm accuracy. You need one at a known location as the base station, the other one goes on the rover (mower).
So we need a base station, probably a RaspberyPI to allow easy wireless access from a computer for config and debugging. A LoRA conection from the base station to the rover. A processor (Arduino) on the rover to manage the GPS, LoRA and driving the mower from waypoint to waypoint.
Mower hardware should be a battery powered mower, Ryobi's 40V line looks cost effective. Add two BLDC drills that can be indpendantly controlled from the Arduino and we have the ability to steer.