Dragino MS14-S OpenWrt with SD Card

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In the process of designing an extension board for the Dragino MS14[1], I wanted to include a microSD connector[2]. Realizing I have never actually tried to interface an SD card before, I thought I better test it out at first. This document contains my notes.


The contacts of an SD card is shown here[3]:

SD Contacts.jpg


Dragino SD Card 1.jpg Dragino SD Card 2.jpg
Fig. 1 Fig. 2
Dragino SD Card 3.jpg Dragino SD Card 4.jpg
Fig. 3 Fig. 4


  1. http://www.dragino.com/products/mother-board/item/72-ms14-s.html
  2. http://en.wikipedia.org/wiki/Secure_Digital
  3. http://elm-chan.org/docs/mmc/mmc_e.html