SoundOff: Low-Cost Passive Ultrasound Tags | Dark Hacker News

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SoundOff: Low-Cost Passive Ultrasound Tags(yibo-fu.com)

78 points by jonbaer 12 days ago | 1 comment

SoundOff: Low-Cost Passive Ultrasound Tags | Dark Hacker News

HelloUsername 12 days ago |

Ongoing discussion: https://news.ycombinator.com/item?id=47998638