Yestino - The Signal · LEDhttps://yestino.com/zh-CN/entities/led-35d313与 LED 相关的全部事件zh-CNA PCB business card with a batteryless LED, powered by the phone that taps ithttps://yestino.com/zh-CN/events/a-pcb-business-card-with-a-batteryless-led-powered-by-the-ph-b17a16https://yestino.com/zh-CN/events/a-pcb-business-card-with-a-batteryless-led-powered-by-the-ph-b17a16Tue, 01 Sep 2026 20:46:03 GMTI made a circuit-board business card that opens my website and lights an LED with power harvested from the phone tapping it. 来源：Hacker News