Someone made a literal credit card-sized ESP32 computer, and so can you
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A maker named Krauseler built a fully functional computer that fits the exact dimensions of a credit card, using an ESP32-C3 processor, an e-ink display, and an NFC chip. The project was motivated by a desire to achieve true credit-card form factor — including thickness — unlike commercial 'card-sized' devices that fall short. Schematics are available on GitHub. Potential use cases include a smart home dashboard, 2FA authenticator, or NFC ticket wallet, though the creator is still brainstorming applications.
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Not sure what it'll do in there, though81 Impressions