Robots That Eat Bugs and Plants for Power
Controversial robots devour biomass to gain energy independence No matter how intelligent a robot might be, it’s nice knowing you can pull its plug to halt the anti-human insurrection. Whoops, not anymore. A new cohort of ’bots that make energy by gobbling organic matter could be the beginning of truly autonomous machines. This first wave of biomass-munching robots has been designed with safe, slow, long-term vocations in mind, such as surveillance, clearing land mines, or monitoring sewer pipes and other locales too dark for solar cells. Take EcoBot II, the tambourine-size fly-eating machine built by Bristol Robotics Laboratory in England. Engineers hand-feed this robot insects, which it digests in a microbial fuel cell—essentially a tank of sludgy bacteria and oxygen—that converts the insects into electricity. An eight-fly meal can drive it up to seven feet. EATR (for Energetically Autonomous Tactical Robot), a car-size military reconnaissance ’bot, will...