TL;DR
Muxcard has developed a working computer roughly the size of a credit card, using DIY methods and off-the-shelf components. The project demonstrates new possibilities for compact, portable electronics. Details are still emerging as development continues.
Developers behind Muxcard have announced the creation of a fully functioning computer no larger than a credit card, built around an ESP32-C3 microcontroller, with plans to launch soon. This breakthrough pushes the boundaries of miniaturized electronics and could enable new applications in wallets, security, and IoT devices.
The Muxcard project features a custom-built, credit card-sized computer incorporating an ESP32-C3 chip, an e-paper display, NFC, and a DIY flexible PCB. The developer has shared a prototype and detailed the process of miniaturization, including custom PCB fabrication using a 3D printer and chemical etching techniques. The current prototype is fragile but confirms that such a device is feasible within the strict thickness constraints of approximately 1mm, including the NFC card frame. The developer plans to refine the design, improve durability, and prepare for a product launch, with sign-up options available for updates.
While the prototype is functional, it remains in early testing stages, focusing on durability, battery life, and usability. The project has garnered significant attention for its ambitious goal of integrating a complete computer into a standard credit card form factor, with potential applications ranging from digital wallets to portable hacking tools.
Why It Matters
This development matters because it demonstrates the possibility of ultra-compact, self-contained computing devices that fit into everyday objects like credit cards. Such a device could revolutionize portable security tokens, minimalist wallets, and embedded IoT systems, offering new levels of convenience and security. It also pushes the technical boundaries of DIY electronics and PCB fabrication, inspiring innovation among makers and developers.
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Background
The concept of credit card-sized electronics is not new, but previous attempts have often fallen short of true portability or durability. Commercial products like AirTag trackers or NFC cards exist, but they lack full computing capabilities. The Muxcard project builds on prior prototypes but aims to deliver a fully functional computer within the strict size and thickness constraints of a standard credit card, a challenge that has persisted for years among DIY enthusiasts and hardware developers.
“After months of iteration and sleepless nights, I finally have a working prototype of a computer the size of a credit card. It’s a tiny but functional device that opens up new possibilities for miniaturized tech.”
— The Muxcard creator
“Our goal was to stay around 1mm thickness while maintaining full functionality, and the current prototype proves that’s possible with careful design and DIY fabrication methods.”
— The developer
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What Remains Unclear
It is still unclear how durable the final product will be for daily use, or how long the battery will last under typical conditions. The developer is still testing these aspects and has not yet announced a commercial release date. Additionally, questions remain about manufacturing scalability and integration of additional features.
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What’s Next
The developer plans to continue testing the prototype for durability, battery life, and usability. Future updates will likely include refinement of the PCB, increased robustness, and preparation for production. A launch event or crowdfunding campaign may be announced once the prototype is finalized.
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Key Questions
What can the Muxcard do currently?
The current prototype can run basic functions such as NFC communication, display simple information on the e-paper screen, and perform minimal computing tasks. It is primarily a proof of concept at this stage.
When will the Muxcard be available to the public?
The developer has not announced an official release date but plans to launch soon after further testing and refinement. Interested users can sign up for updates on the project’s website.
What are the main challenges in developing this device?
Key challenges include maintaining the ultra-thin profile, ensuring durability, managing power consumption, and refining DIY PCB fabrication techniques to be scalable and reliable for mass production.
Could this device be used for security or hacking purposes?
Yes, the developer mentions potential applications such as pentesting, ethical hacking, and secure authentication, which could make it a versatile tool for security professionals.
Source: Hacker News
