A drone from a Dutch university lab now finds its way by touch instead of sight.
Researchers at Delft University of Technology built a whisker-based tactile sensor for drones weighing under 100 grams. Two whiskers, mounted upward at the front of the drone, each connect to three miniature pressure sensors at the base. When a whisker brushes a surface, shifts across those sensors let the drone estimate its distance and position relative to that surface, well enough to follow walls, dodge obstacles, and build a rough map of its surroundings. A real-time processing pipeline filters out airflow turbulence from genuine surface contact and runs on just 34 kilobytes of memory, giving the system millimeter-scale precision. Associate Professor Salua Hamaza said the team wanted tactile navigation that lets a drone fly through the unknown by feel.
Cameras, LiDAR, and GPS all assume clear air, open sky, or enough light to see by. Collapsed buildings, smoke-filled rooms, and dust clouds offer none of that, which is precisely where search-and-rescue drones need to work. A sensor this small and cheap sidesteps the usual tradeoff in micro-drone design, where every gram of camera or processor eats into flight time and payload. Researcher Chaoxiang Ye put it plainly: touch does not have to cost size or computing power.
Whiskers will not help a drone race through open air or dodge a tree at 40 miles an hour. But for a machine feeling its way through rubble one wall at a time, sight was never the point.