Im not sure I got it. It generates acoustic signals and a microphone server picks them up. If so, will it penetrate through walls?
fragmede2026-05-06 18:04
ENGLISH (원문)
The microphone is on a smart watch the user is wearing.
croes2026-05-06 18:04
ENGLISH (원문)
Unlikely because it’s ultrasonic sound, at least if you have brick walls. Could work for drywalls
cyberax2026-05-06 18:11
ENGLISH (원문)
Trivia time! The first practical wireless remote control for TVs also used ultrasound: https://www.youtube.com/watch?v=MLPk1Us62xQ
combocosmo2026-05-06 18:12
ENGLISH (원문)
It's a unique idea that I could see being useful in select situations. The reliance on wearable microphones sounds like a downside. Also I guess this might be annoying for pets that can hear well beyond 20 kHz.
ogig2026-05-06 18:24
ENGLISH (원문)
I can see some uses, but calling this system batteries free seems a stretch. A sensor is worth nothing if it can't be read, and to read this you need a powered microphone and computing. Some already common magnetic door systems do the same; door plate and magnet movement is enough to create a detectable current, (using no external power), then that signal is read and computed by an electronic/digital system (using power).
phh2026-05-06 18:29
ENGLISH (원문)
I'm on the side of "clever, fun, but feels useless". But to defend the project, all sensors require a powered central system. It's pretty common for Zigbee to have one repeater per room [1], which is just what is needed for this system. [1] Because any AC-powered Zigbee device is a repeater, so just a bulb or a plug is enough
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