SparkFun SD/MMC Card Breakout

BOB-12941 RoHS Open Source Hardware

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$ 9.95

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In stock	75 in stock
9.95	1+ units
8.96	10+ units
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SparkFun SD/MMC Card Breakout

BOB-12941 RoHS Open Source Hardware

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: 1.3" x 1.5"

Documents:

Schematic
Eagle Files
Datasheet (SD/MMC Socket)
GitHub (Design Files)

bboyho / about 2 weeks ago * / 4

You must bring the voltage down from a 5V Arduino with a logic level converter. If you don’t have a logic level converter, you can use some resistors like this http://opengears.blogspot.com/2012/01/cheap-diy-sd-card-breakout-board-for.html. To use with Arduino, there is an SD card library that has already been written => http://arduino.cc/en/Reference/SD.

Note: Chip Select should be D3 http://pinouts.ru/Memory/sdcard_pinout.shtml, D0 = MISO, and D1 = MOSI.

Here’s an additional tutorial that might be of some use => http://arduino-info.wikispaces.com/SD-Cards
- Briscoe / about 2 weeks ago * / 1
  Not quite, CMD should be hooked to Mosi.
  
  http://elasticsheep.com/2010/01/reading-an-sd-card-with-an-atmega168/
  
  Here is the connections I used to get it working, used the CardInfo example sketch and an arduino due to test the system
```
**************************************
BREAKOUT  -     ARDUINO
**************************************
D3               -     chipSelect  (default pin 4 in sketch)
CMD            -     MOSI
CLK             -     SCK
D0               -     MISO
VDD            -      3.3v
GND            -     GND
```
DaddyOh / about 2 months ago / 3

It is late and I am very tired. If this is obvious I’m not getting it. For the life of me I can’t decipher the pin out to sd card / spi on the breakout. From the upper left (card goes in in the right) they are labeled

D2 D3 CMD CD CLK VCC GND D0 D1 WP

I want to hook this up to a spi bus device (mbed) and I get the VCC, GND, CLK but which ones are:

SPI mosi SPI miso CS
Member #602203 / about 2 months ago / 2

We are also struggling finding the CS, like DaddyOh has reported :/

Please help
IgnacioV / about 6 months ago / 2

Mounting holes are always good.
8r13n / about 5 months ago / 1

Do I need to add anything to this or can I wire it directly to my microprocessor board? I know normally there are some pull up/down resistors.
- Summit783 / about 4 months ago / 1
  
  Yeah you may need some resistors on the SPI lines actually. I would recommend “SD Card Projects Using the PIC Microcontroller” by Dogan Ibrahim. He walks you through a variety of different projects, near the end he has a data logging project. Even if you’re not using a PIC, it may still be worth a look so that you know what to be cognizant of with your circuit.
  - 8r13n / about 4 months ago * / 1
    
    Does it make a difference if I’m using an STM32F4 to drive it? I won’t bit bang, I’ll be using the SDIO hardware feature of the chip? I have internal resistors, they’re not strong enough?
    
    I’ve been working with SD cards for a long time now using this chip. But they’ve always been on the same board.
    - Summit783 / about 4 months ago / 1
      
      I’m not sure about the STM32F4, as long as it has some type of SPI module, you should be fine.
      
      But internal resistors will not be strong enough, here’s a promising webpage I found about SD cards and PIC projects. Even if you’re using a diff mcu (microcontroller) the main takeaways are the same (1) use a library to comm with the SD card and (2) have some resistors on the lines from your mcu to the SD card. This is the link: http://www.studentcompanion.co.za/post/2013/09/29/Interfacing-SD-Card-With-PIC-Microcontroller-MikroC
      - 8r13n / about 3 months ago / 1
        
        I’ll try it and report back. That link seemed to say they needed the resistors because their IO logic pins were ~4v. Stm32 is 3.3v :)
- IgnacioV / about 5 months ago / 1
  
  It’s just the bare socket. All the interface stuff is your problem.