RoboFly is first flying-insect micro-robot to go tetherless
You might remember RoboBee, an insect-sized robot that flies by flapping its wings. Unfortunately, though, it has to be hard-wired to a power source. Well, one of RoboBee’s creators has now helped develop RoboFly, which flies without a tether.
Slightly heavier than a toothpick, RoboFly was designed by a team at the University of Washington – one member of that team, assistant professor Sawyer Fuller, was also part of the Harvard University team that first created RoboBee. That flying robot receives its power via a wire attached to an external power source, as an onboard battery would simply be too heavy to allow the tiny craft to fly. Instead of a wire or a battery, RoboFly is powered by a laser.
That laser shines on a photovoltaic cell, which is mounted on top of the robot. On its own, that cell converts the laser light to just seven volts of electricity, so a built-in circuit boosts that to the 240 volts needed to flap the wings. That circuit also contains a microcontroller, which tells the robot when and how to flap its wings – on RoboBee, that sort of ‘thinking’ is handled via a tether-linked external controller.
In its current form, RoboFly can only take off and land, as doing anything else moves its photovoltaic cell out of alignment with the laser. Down the road, though, it is hoped that the laser will be able to track with the robot as it flies, continuously powering it. It’s even possible that future versions of the robot might be able to harvest energy from radio frequency signals, using more advanced microcontrollers to autonomously perform tasks in places that traditional larger drones couldn’t go.