'Battery-free, quiet, and inherently private' — These 3D-printed metal tags could change home and office tracking, turning penny-sized discs into smart devices using ultrasonic tech for maintenance-free monitoring without charging
Researchers at Georgia Tech have developed battery-free, 3D-printed metal tags that use ultrasonic technology to track everyday actions like opening doors or cabinets. The tags generate unique ultrasonic signals when struck by a moving part, with different shapes producing distinct frequencies for identification. These signals are detected by nearby microphones and recorded by wearable devices, enabling maintenance-free, private monitoring. Potential applications include smart homes, elder care, waste management, and archival systems.
- ▪The metal tags are powered by motion and generate ultrasonic signals without batteries or electronics.
- ▪Each tag's unique shape produces a distinct ultrasonic frequency, allowing multiple tags to operate nearby without interference.
- ▪Ultrasonic signals are inaudible and localized, enhancing privacy and reducing unintended detection.
- ▪Simulation tools helped design over 1,300 tag variations, with 15 tested successfully in real-world scenarios.
- ▪Applications range from monitoring elderly routines to tracking inventory in libraries or waste bins.
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Pro 'Battery-free, quiet, and inherently private' — These 3D-printed metal tags could change home and office tracking, turning penny-sized discs into smart devices using ultrasonic tech for maintenance-free monitoring without charging News By Wayne Williams published 28 April 2026 The tags use ultrasonic sound to record everyday actions When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. (Image credit: Georgia Tech) Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter Battery-free metal tags generate ultrasonic signals when objects move nearbyDifferent disk shapes create unique sound…
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