A PCB business card with a batteryless LED, powered by the phone that taps it

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By WebNovare Imports 1 min read

I made a circuit-board business card that opens my website and lights an LED with power harvested from the phone tapping it.

WebNovare Imports W
A PCB business card with a batteryless LED, powered by the phone that taps it

I made a circuit-board business card that opens my website and lights an LED with power harvested from the phone tapping it.

Source: kevin.md (30 points, 10 comments) Hacker News discussion

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