A developer designed a credit-card-sized PCB business card featuring an NFC chip that opens his website when tapped and a red LED that lights up on a printed Charizard's tail, powered entirely by the phone's own NFC radio field rather than any onboard battery. He had to write a custom Core NFC app for iPhone because standard NFC apps couldn't write to the blank NTAG I2C Plus chip he used, so his app sends the chip's native write commands directly.
kevin.md
· 2026-09-01
A hobbyist designed a PCB business card that uses an NFC chip's energy-harvesting capability to power 21 LEDs and an ATtiny412 microcontroller, all without a battery. Tapping the card against a phone triggers an LED animation, drawing power solely from the phone's NFC field via chips like the NXP NTAG I2C Plus or STMicro ST25DV-KC that can route excess harvested voltage to external components. The creator built the project in about three months as a way to learn KiCad, and has published the full design files publicly.
wilsonharper.net
· 2026-08-28
A GrapheneOS user reports that the PayPal app now fails to launch, throwing a RootDetectionSecurityException citing a security policy violation. The user suspects the crash may be tied to having enabled the PayPal card for contactless NFC payments, though this hasn't been confirmed as the sole trigger.
news.ycombinator.com
· 2026-08-27
GoKawiil