Forget Raspberry Pi: this computer is the literally the size of a credit card
A Redditor has built a functioning computer that is literally the size of a credit card, measuring around 1mm thick. The device includes Wi-Fi, NFC, an e-paper display, and its own battery, but is fragile and not meant to replace larger computers. The creator, krauseler, spent months building the prototype and had to make several compromises, including soldering individual wires to 0.5mm-pitch pads by hand.
- ▪The computer is built around an ESP32-C3FH4 SoC with Wi-Fi and Bluetooth LE
- ▪It includes NFC read/write support, a 1.54-inch 200 x 200 e-paper display, and an accelerometer
- ▪The device is powered by an ultra-thin LiPo battery with charging circuitry and power path management
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Electronics Tech Culture diy microcontroller Forget Raspberry Pi: this computer is literally the size of a credit card A Redditor's 1mm-thick build includes Wi-Fi, NFC, an e-paper display, and its own battery By Rob Thubron May 18, 2026, 9:45 Serving tech enthusiasts for over 25 years. TechSpot means tech analysis and advice you can trust. In brief: We've seen plenty of tiny computers described as being credit card-sized, but that usually means they have roughly the same footprint as a payment card – rather than actually fitting inside a wallet. One Redditor decided to tuen the phrase into a literal one, building a functioning, battery-powered computer that is around 1mm (0.039 inches) thick.
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