🤖 The World's Smallest Robot Fits on the Tip of a Needle

These new robots are just 200 × 300 × 50 micrometers, smaller than a grain of salt. However, each contains a processor, temperature sensors, and tiny solar panels on a single chip.

Engineers at the University of Pennsylvania and the University of Michigan designed ultra-compact circuits that operate at extremely low voltages and consume 1,000 times less power than conventional chips. Each robot needs just 75 nanowatts of power, supplied by miniature solar cells. Its onboard computer is programmed using brief pulses of light.

The robots swim through liquid and can operate for months without maintenance. They move by generating an electric field that interacts with ions in the surrounding fluid. Those ions push against water molecules, creating currents that propel the robot in the desired direction.

To transmit data, the researchers devised an unconventional solution: the robot communicates through a form of "dance." By observing its movements under a microscope, scientists can decode the information—a method the engineers compare to the way bees communicate.

🦠 The developers believe devices like these could one day operate inside living cells, assemble microcircuits, or monitor water quality.

@hiaimediaen