Customize Your SD Card for Microcontroller Projects

Innovation in Data Storage for Microcontrollers

When embarking on a microcontroller project that requires data storage, choosing an SD card is a common and cost-effective solution. Compared to other storage methods, SD cards are not only affordable but also resistant to physical and magnetic shocks, making them user-friendly from both hardware and software perspectives. However, it may seem impractical to add an SD card slot to a circuit that doesn’t require a backup card.

[DIY GUY Chris] offers a solution: an SD chip without a card from XTX, which can serve as a direct replacement for your projects. The XTXD0*G series features NAND flash chips identical to those found in an SD card, but without the card itself. This allows you to utilize SD card access libraries to expedite prototyping without the additional expense of a real card reader.

In his tutorial and accompanying video, [Chris] demonstrates how he used the 4 GB version, XTSD04GLGEAG, to create a custom SD-compatible board that works seamlessly in your laptop's card reader or on a breadboard.

To connect it to the breadboard, [Chris] uses standard 2.54 mm connectors and relies on a custom-cut printed circuit board (PCB) to link it to a card reader. He mentions the need to construct the board with a thickness of 0.6 mm if he intends to connect it like a micro SD card. Once you become accustomed to these small NAND chips, there's no need to mount them on breadboards, although this seems like a creative way to test them.

You are not required to keep your flash chip on a PCB the size of an SD card; similar techniques have been used in creating modern game cartridges. If you prefer using a standard SD card and do not wish to buy a slot, you can certainly build one yourself.