Georgia Tech Team Develops Battery-Free Ultrasonic Sensors for Smart Homes
A Georgia Tech engineering team, led by Yibo Fu, has developed an experimental platform called SoundOff, which introduces battery-free ultrasonic sensors for smart home automation. This innovation aims to replace traditional battery-powered sensors that require frequent recharging or replacement. The SoundOff system utilizes a penny-sized metal disc with specialized notches mounted on a 3D-printed base. This setup is designed to be attached to open-close mechanisms like doors or drawers. When the item is activated, a small plastic tab strikes the metal disc, causing it to emit a hyper-specific ultrasonic sound. This sound, which is above 20 kilohertz and inaudible to human ears, is then detected by a microphone-equipped device. Custom software interfaces with this device to trigger specific home automations, eliminating the need for batteries, Wi-Fi receivers, or complex technology.
