Robotic lawn mowers have become more sophisticated over the years. Don’t feel like spending a fortune on one? You can build your own. The Ardumower is a 3D printed robotic lawn mower that detects boundaries and mows your lawn continuously. It can handle up to 500m2 of space.
You are going to need a 3D printer, ABS/PLA filament, and a few other tools to get started. The Ardumower is powered by two 12v geared motors and Arduino. More information is available here.