As far as we know, this is the smallest legged robot in existence
A few years ago, we wrote about the tiniest little quadruped robot we’d ever seen—a mere 20 millimeters long, with a hip height of 5.6 mm and weight of about 1.6 gram. The designer, Ryan St. Pierre from Sarah Bergbreiter’s lab at the University of Maryland, also showed us a picture of an even smaller version that weighed just 100 mg. When we saw these things at ICRA 2016, we asked Ryan about going even smaller:
“It’s always a fun challenge to try to make robots as small as possible,” he told us. “Currently, I am working on making a robot, of the same design, that would be 2.5 mm long, an order of magnitude smaller than the ones we presented at ICRA. Smaller robots can more easily go places that larger robots can’t, and having them in various sizes would increase their utility.”
As it turns out, an order of magnitude wasn’t good enough, and instead, St. Pierre developed a quadruped that’s 10 times smaller than that: It weighs just one single milligram, and is smaller than an ant’s head.
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