The open-source WiFi SD Card project, led by Lukas Henkel, aims to create a versatile, compact Linux-based system that fits within an SD card form factor. The core of this design is a System-in-Package (SiP) that integrates essential components, including a PMIC (Power Management Integrated Circuit), 4GB LPDDR4x memory, and up to 128GB of storage. By adding just a few external components such as a WiFi chip, antenna, and some basic power management circuitry, it’s possible to build a fully functional Linux system within a tiny, flexible SD card frame. With built-in WiFi capability, this SD card can wirelessly transfer files on non-wireless devices, making it ideal for various niche applications.
The project involves creating a 3D-printed SD card frame, which can be easily produced on an SLA printer, and using a simple four-layer flex PCB (Printed Circuit Board) as the carrier for the electronics. WiFi-enabled SD cards have been available for some time, but this open-source version offers more hardware resources, allowing users to run custom firmware and explore new possibilities. With a user-friendly design and simplified electronics integration, this project in ultra-thin devices could pave the way for innovative, wireless SD card applications. The project offers a practical approach to integrating advanced electronics into small, portable formats.
