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Description: With SD and MMC memory prices dropping, the time is right for mass storage and datalogging. This breakout board will allow you to breakout the SD/MMC socket to a standard .1" 10-pin header. Perfect for breadboarding and the likes. Board comes fully assembled and tested as shown.

Dimensions: 1.3x1.5"

Documents:

Replaces: BOB-00204

Comments 16 comments

  • If ever there were a Sparkfun product that needed a hookup guide, this would be it.

  • I think this is how the pins are assigned: 1) WP 2) DAT1 = IRQ 3) DAT0 = DOUT 4) GND 5) Vcc = 3.3V 6) CLK = SCLK 7) CD 8) CMD = DIN 9) CD/DAT3 10) DAT2 = RW only pin 3 (DAT0 = Dout), pin 6 (CLK=SCLK), pin 8 (CMD = Din), pin 9 (CD/DAT3 = CS) aside from Vcc and gnd are needed. Provide pull up resistor of around 10K for pins 3, 6, 8, and 9.

  • Hey, Sparkfun!

    Can we get a once-and-for-all statement regarding the wiring? Assume I am using an Uno, 5V (I’m not but let’s talk pins instead of acronyms just to avoid further confusion), here are my questions:

    Which pin on this board do I connect to Uno’s pin 13?

    Which pin on this board do I connect to Uno’s pin 12?

    Which pin on this board do I connect to Uno’s pin 11?

    Which pin on this board do I connect to the Uno pin I have nominated to be CS? I’m using pin 4.

    Which of these pins 4, 11, 12, 13 require level shifting?

    • GOT IT!! On the UNO: CS = Arduino pin 10 = D3 on PCB | MOSI = Arduino pin 11 = CMD on PCB | SCK = Arduino pin 13 = CLK on PCB | MISO = Arduino pin 12 = D0 on PCB

      According to schematic pin 12, MISO, does not need any level shifting, connect direct to Arduino. I am using a MC14050BCPG level shifter to put out the 3.3V. Arduino 1.0.5 with SD.h library

  • It’s unfortunate that this breakout board doesn’t have logic level converters on it so it can be used with +5V microcontrollers. I’ll not be purchasing this board therefore.

    • If this is really what you want then you should look on ebay where you can find what you want for less money than this.

      However I think it’s very fortunate that this board doesn’t have any extraneous parts and that is why I am purchasing this product.

      • I think both of you are correct. I bought it, then it struck me, “I betcha it’s 3.3V”…

  • kglad1’s “schematic” works great if you’re curious about how to wire this to your Arduino. Just remember when using a Mega the SPI pins are not the same.

    pin 13 or 52 Mega pin 12 or 50 Mega pin 11 or 51 Mega pin 10 or 53 Mega

  • I have been able to get the older version of this card working with an Arduino reading and writing data. The new breakout board does not have a connection labeled CS. After reading the forum one person suggested that D3 is the SPI CS line on the breakout board. On the schematic pin one is CD/D3. On the Breakout board pin one is labeled D2. I tried using D2 as the CS line and D3 (pin 2 on the breakout board and labeld as CMD in the schematic) and still could not get the Arduino to recognized an SD card that is recognized on the earlier breakout board. What is the relationship top the labeled pins on board to the schematic? Does CD and D2 which is the first pin need to be connected somehow? Which pin on the board functions as CS line? I appreciate any clarification on this. I am using the following wiring/Fritzing diagram. http://garagelab.com/profiles/blogs/tutorial-how-to-use-sd-card-with-arduino. Thanks.

    • I got it to work. Here are the connections if using SdFat library. The above comments make more sense now :).

      D2 nothing

      D3 Chip Select line (CS) needs pull down resistors

      CMD pin 11, no pull down resistors

      CD nothing

      CLK clock connect to pin 13, needs pull down resistors

      VCC 3.3V

      GND ground

      D0 pin 12, needs pull down resistors

      D1 nothing

      WP nothing

      • If I’m correct, as the Arduino pins outputs 5V and the MMC/SD card needs to be operated at about 3.4V, MISO does not need a voltage divider, while MOSI does. According with the connections scheme you suggest, CMD/PIN 11 is MISO (it doesn’t need pull down resistor) and D0/PIN 12 is MOSI (and thus it needs the pull down resistor)?

  • i have the same question about wiring- also which pin can be used for CS? i have tried wiring according to this: http://arduino.cc/playground/Learning/SDMMC with D0 as MISO and CMD as MOSI and CD as CS

    • Yes, that is correct, I am using the same scheme although I haven’t tested it on the new board yet. I’m assuming WP stands for write protection, but not sure what to connect to that pin if I am not using it. The datasheet says to put pull-up resistors on any unused connections namely D1 and D2.

  • How to wire this so the card is recognized and noted as not write protected, the pins listed as MISO and MOSI are not noted to any of the specific data pins.

    Perhaps my inexperience with these is the problem, but the drawings could note if multiple pins can be data in and out.

  • Replacement: BOB-11403. We’ve revised this board to fit a new SD card socket, it has stayed the same otherwise.


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