Inspired by Bumblebees
Researchers at the University of California, Berkeley, have developed the world’s smallest wireless flying robot, drawing inspiration from bumblebees. This insect-sized device measures less than one centimeter in diameter and weighs only 21 milligrams—lighter than a grain of rice. Unlike traditional drones that require onboard electronics and power sources, which are challenging to miniaturize, this robot operates without such components. Instead, it utilizes an external magnetic field for both power and control, allowing it to hover, change direction, and target specific points, effectively mimicking the flight behavior of real bees.
Overcoming Miniaturization Challenges
The absence of onboard electronics and batteries addresses significant challenges in scaling down flying robots. By leveraging external magnetic fields, the UC Berkeley team achieved precise control over the robot’s movements without adding weight or complexity. This approach not only simplifies the design but also enhances the robot’s agility and responsiveness.
Co-first author of the study, grad student Wei Yue (left) poses with Prof. Liwei Lin (right) – along with a couple of the robots (Adam Lau/Berkeley Engineering)
Potential Applications in Agriculture and Rescue
Potential applications for this tiny robot are vast. In agriculture, it could assist in artificial pollination, reducing the burden on declining bee populations. Additionally, its ability to navigate confined spaces makes it ideal for search and rescue operations in disaster-stricken areas where larger drones cannot reach. The development represents a significant advancement in micro-robotics, opening new avenues for deploying miniature robots in various fields.
This research was published in the journal Science Advances on March 28, 2025.
