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Project of the Month: An Autonomous Lawn Mower
It took Hubert Pissavin two weeks in his garage to build a machine that would do his least favorite chore for him: mowing the lawn. The retired electrical engineer started with a simple, boxy chassis made of wood. With four motorized wheels and a spinning blade, the battery-powered device moves in a straight line until it bumps into an obstacle, which activates a relay switch that backs the mower up about three feet.