A PCB business card with a batteryless LED, powered by the phone that taps it
By thekevintang · 2026-09-01 · 24 points · 7 comments
https://www.kevin.md/the-business-card-that-lights-up.md/
By thekevintang · 24 points · 7 comments · on Hacker News, read on BetterNews.
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