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A maker has built a fully working computer the size of a credit card, featuring an ESP32-C3 chip, e-paper display, and NFC. This innovation could enable new minimalist devices and security tools. The project is in prototype stage with ongoing testing.
A developer has unveiled a fully functioning computer the size of a credit card, built around an ESP32-C3 microcontroller, e-paper display, and NFC chip, marking a significant breakthrough in miniaturized electronics.
The project aims to produce a tiny, standalone computer that maintains the form factor of a standard credit card, including thickness constraints around 1mm. The current prototype uses a custom-built flexPCB and a carved NFC card frame, with the developer emphasizing the importance of maintaining the card’s slim profile.
The developer, who has shared progress on social media and plans to launch the project soon, reports that the prototype functions well despite being a rough, handmade version. The device can potentially serve as a minimalist wallet, NFC key, ticket, or security device, among other uses.
Why It Matters
This development pushes the boundaries of miniaturized computing, opening possibilities for new types of portable, discreet, and secure devices. It could impact personal security, digital wallets, and IoT applications by providing a compact, integrated hardware platform.
miniature credit card size computer
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Background
While the idea of credit card-sized smart devices isn’t new, actual working prototypes that fit within the strict thickness constraints are rare. Previous concepts have often involved bulky components or external modules. This project stands out by achieving a fully integrated computer within the size and thickness of a standard credit card, with ongoing efforts to improve durability and functionality.
“The core concept works. No external power. No hidden electronics outside the card. Just a ridiculously thin computer.”
— the developer
“It was worth the extra effort to shave off every millimeter of thickness, even if it meant handmade, fragile parts.”
— the developer
What Remains Unclear
It remains unclear how durable the prototype will be in daily use, and whether the hardware can be mass-produced reliably. Battery life, long-term stability, and security features are still under testing and development.
What’s Next
The developer plans to continue testing the prototype for durability, battery performance, and usability. They will also work on refining manufacturing processes and preparing for a potential public release or crowdfunding campaign.
Key Questions
What are the main applications for this credit card-sized computer?
Potential uses include minimalist wallets with NFC, security tokens, offline password managers, crypto wallets, and digital business cards that are memorable and discreet.
How does the device get power?
The current prototype operates without external power, relying on a small embedded battery designed for testing purposes. Future versions may include larger batteries or energy harvesting methods.
When will this device be available to the public?
The developer has not announced an official release date yet but plans to launch soon, with updates on their website and social media channels.
What challenges remain before mass production?
Key challenges include ensuring durability, reliable manufacturing of ultra-thin components, battery integration, and securing regulatory compliance for NFC and security features.
Source: Hacker News
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