Cornell researchers built untethered robots just 100–250 micrometers long that use light for power and a tiny onboard CMOS circuit to control their walking. Their “brains” are timing circuits—not AI computers—and the work is a research demonstration, not a medical robot available for use inside people.
What does “electronic brain” mean in these robots?
It is a small application-specific integrated circuit (ASIC) made with complementary metal-oxide-semiconductor (CMOS) technology. In the 2022 robots, the circuit contains about 1,000 transistors, along with diodes, resistors and capacitors. It produces phase-shifted electrical square waves that determine when the robot’s legs move.
That is a narrow but useful kind of control: the circuit supplies a repeating timing pattern, rather than interpreting the world, planning routes or learning as an AI system might. The circuit operates on less than 1 microwatt, according to the 2022 Science Robotics paper.
How do the robots walk by themselves?
- Light supplies energy. Silicon photovoltaic elements on the robot convert incoming light into electricity for the control circuit and actuators. The robots are untethered, but they are not independent of an energy source: they need illumination.
- The circuit sets the leg timing. Its phase-shifted signals switch the actuators in a sequence that produces a gait. This onboard timing replaces the earlier approach of externally manipulating leg groups to make the robots move.
- Platinum legs bend. Each electrochemical actuator uses an exposed platinum surface. When voltage is applied, oxygen adsorption expands that surface and bends the leg. The paper describes the actuator layer as about 7 nanometers of platinum with a titanium cap.
- Repeated bending creates movement. Coordinated leg motion makes the robot walk; the reported prototypes moved faster than 10 micrometers per second, according to the 2022 paper.
The circuit does not steer the robot around obstacles. It generates the timing that drives its gait, which is a more limited form of autonomy than navigation.
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How small are the robots, and what designs were demonstrated?
The 2022 robots measure 100–250 micrometers. The researchers demonstrated three body and leg arrangements:
- Purcell bot: a two-legged design.
- Antbot: a six-legged design using an alternating tripod gait.
- Dogbot: a four-legged design. A modified circuit let it respond to an optical command: a laser pulse changed its leg frequency, and therefore its speed.
That dogbot demonstration adds a limited external instruction to the onboard timing system. It does not establish that the robot can sense its surroundings or make decisions about what to do.
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What changed from earlier Cornell microrobots?
Cornell’s 2020 generation had photovoltaic silicon bodies and four electrochemical legs, but relied on laser pulses to switch groups of legs. The 2022 work integrated a foundry-made control circuit with the robot, addressing the challenge of fitting onboard electronics into a machine at this scale. The paper describes the 2022 robots as about 10,000 times smaller by volume than previous robots with onboard CMOS electronics.
| Generation | Control and power | Scale or demonstrated behavior | What the evidence establishes |
|---|---|---|---|
| 2020 Cornell robots (Cornell report, 2020) | Silicon photovoltaics powered the robot; laser pulses switched leg groups. | About 5 micrometers thick, 40 micrometers wide and 40–70 micrometers long. Cornell estimated that roughly 1 million could fit on a four-inch silicon wafer. | Leg motion was externally switched; the report does not describe an onboard CMOS gait-control circuit. |
| 2022 walking robots (Cornell report and Science Robotics paper, 2022) | Light-powered silicon photovoltaics supplied a CMOS timing circuit and electrochemical legs. | 100–250 micrometers; demonstrated walking faster than 10 micrometers per second. | Onboard gait timing was demonstrated, including a laser-triggered speed change on a modified dogbot. |
| 2024 Cornell micromachines (Cornell report, 2024) | Sub-nanowatt CMOS oscillators and local electronic pulses synchronized machines. | Synchronization was demonstrated for arrays of up to 16 machines. | This is related progress in synchronizing micromachines, not a capability established for the 2022 walking prototypes. |
The 2022 ASIC was fabricated in X-FAB’s 180-nanometer CMOS silicon-on-insulator process. Cornell’s fabrication flow used 13 photolithography layers to release the circuits and pattern the actuators. The 180-nanometer figure describes the semiconductor process, not the size of a robot or a transistor.
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Could the robots work inside the human body?
Medical navigation, microsurgery and plaque removal are proposed directions, not demonstrated uses of these prototypes. The reports describe no clinical trials, in-body tests or autonomous travel through human tissue. The same distinction applies to proposed chemical detection, pollution sensing and environmental cleanup: these are possible applications of the platform, not reported deployments.
Using the robots in a body would require capabilities beyond a repeating gait circuit, including a way to operate in the target environment and control or guide motion appropriately. The cited demonstrations establish light-powered locomotion and limited optical speed control; they do not establish those medical capabilities.
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Can you buy Cornell’s microrobots?
No commercial product is identified in Cornell’s 2022 report or the associated paper. These are bespoke research prototypes made from integrated circuits, photovoltaics and microfabricated actuators, not retail robots. The sources also do not establish a retail price or general purchase channel.
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