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halcy.de on Hacker News

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Screenshot of halcy.de: Measuring power network frequency using junk you have in your closet

Measuring power network frequency using junk you have in your closet (halcy.de)

55 points by zdw 1 year ago | 12 comments

Screenshot of halcy.de: Transmitting data via ultrasound without any special equipment

Transmitting data via ultrasound without any special equipment (halcy.de)

120 points by todsacerdoti 1 year ago | 37 comments