SD card reader for the ATMega128 board.

Sometimes you just need more memory to save data for logging or storing other informations like personal addresses.

For this I developed the SD card interface for my M128 projects. Data is stored on the card using FAT16.

Still under construction!

Here’s the layout of the board. Since sd-cards do need 3.6 V to operate the LM317 vreg will translate the 5V supplied.

Data, CE and clock will be translated with a MAX3392 Chip to interface between the 3V and the 5V logic levels.