# SAMD21 MINI breakout doesn't work with sd card module

**URL:** <https://community.sparkfun.com/t/samd21-mini-breakout-doesnt-work-with-sd-card-module/44165>\
**Category:** Development Tools\
**Created:** [July 5, 2022, 1:36am UTC](https://community.sparkfun.com/t/samd21-mini-breakout-doesnt-work-with-sd-card-module/44165 "2022-07-05T01:36:16Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![smw\_2022](https://avatars.discourse-cdn.com/v4/letter/s/b782af/32.png) [@smw\_2022](https://community.sparkfun.com/u/smw_2022)\
**Post date:** [July 5, 2022, 1:36am UTC](https://community.sparkfun.com/t/samd21-mini-breakout-doesnt-work-with-sd-card-module/44165/1 "2022-07-05T01:36:16Z")

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In my previous post I have OLED, dht22 and RTC connected with the mini breakout board and the sd card module didn’t work.

So I disconnected other parts and only left the sd card module with the small board, but still does not work.

I tried the sd library examples and tried to use different pins like 10,8,4 none of them work.

Really need someone here who can teach me how to connect the sd card module with the samd21 mini breakout.

sd card module

GND-\>GND

VCC-\>VCC

MOSI-\>11

MISO-\>12

SCK-\>13

CS → tried 10,8,4

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**Author:** ![tepalia02](https://avatars.discourse-cdn.com/v4/letter/t/cdc98d/32.png) [@tepalia02](https://community.sparkfun.com/u/tepalia02)\
**Post date:** [July 5, 2022, 7:59am UTC](https://community.sparkfun.com/t/samd21-mini-breakout-doesnt-work-with-sd-card-module/44165/2 "2022-07-05T07:59:03Z")

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Hi, if you try to connect only the SD card module with your SAMD21 MINI breakout (removing every other component), does it work?

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<div class="post-metadata">

**Author:** ![smw\_2022](https://avatars.discourse-cdn.com/v4/letter/s/b782af/32.png) [@smw\_2022](https://community.sparkfun.com/u/smw_2022)\
**Post date:** [July 5, 2022, 11:43am UTC](https://community.sparkfun.com/t/samd21-mini-breakout-doesnt-work-with-sd-card-module/44165/3 "2022-07-05T11:43:51Z")

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Doesn’t work. But the same code works when I use Arduino uno r3 with the same wire strategy.

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<div class="post-metadata">

**Author:** ![smw\_2022](https://avatars.discourse-cdn.com/v4/letter/s/b782af/32.png) [@smw\_2022](https://community.sparkfun.com/u/smw_2022)\
**Post date:** [July 5, 2022, 1:29pm UTC](https://community.sparkfun.com/t/samd21-mini-breakout-doesnt-work-with-sd-card-module/44165/4 "2022-07-05T13:29:18Z")

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> tepalia02:  
> Hi, if you try to connect only the SD card module with your SAMD21 MINI breakout (removing every other component), does it work?

Thanks for your reply.

Doesn’t work. But the same code works when I use Arduino Uno r3 with the same wire strategy.

I also tried max30102 with this mini breakout, the code can compile but nothing showed from the serial monitor.

I am not sure if the small board has an issue or not.