Doppler-effect sonar app lets you scroll your computer with invisible audio gestures
nickbaumann_ · x · 2026-09-09
- @emanperez28 shows off a "sonar" app built with Astra: the computer emits inaudible audio and uses the Doppler effect to track hand position, enabling touch-free scrolling.
- Air double-taps even switch scroll direction — a clever hack turning ordinary speakers/mics into contactless input.
- Quoted in the same post: Sam Altman announced an OpenAI gathering in SF on Sept 16 to celebrate GPT-6 and discuss what to build next; applications close Sept 10.
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