Some students at the LeCroy Career Technical Center have created an automated lawn mower for a national robotics competition. I say they just didn’t want to mow the lawn anymore. But no matter the reason, they have made a pretty cool lawnmower. Having it do all of the work is a nice bonus though.
This Ardumower was made from a motorized wheelchair, a push mower, an Arduino mini-computer, sensors and other parts. First they disassembled the wheelchair, then created the metal frame and then fitted the programmable hardware that allowed them to autonomously or remotely operate it.
They used Google Maps as the coordinate locater, so that they could program the Arduino to cut grass all by itself. They have to work on obstacle avoidance next.
Or if they had about $3000 lying around, they could just go for one of these.