It’s long been possible to make extremely small robots, but they usually need some form of direct external control just to operate. Cornell scientists may have solved that problem on a basic level, however. They’ve created microrobots (no more than 250 micrometers across) with basic electronic “brains” that let them walk autonomously. Two- and six-legged robots move relatively simply, while a four-legged “dogbot” changes speed when an operator sends laser pulses.
The trick was to build a complementary metal-oxide-semiconductor (or CMOS, as computer enthusiasts know it) clock circuit whose signal produces phase-shifted square wave frequencies that set the gait of the robot’s platinum-based legs. Photovoltaics control both the legs and the circuit. The design is far from complex at just 1,000 transistors (for context, a GeForce RTX 4090 has 76.3 billion), and it’s still large enough that it effectively serves as the robot’s body. However, even that is an achievement — the exceptionally low power demands saved Cornell from having to use relatively gigantic photovoltaics.
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