Book Raspberry Pi Python 8..3 Using a MicroSD Card for Datalogging

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All examples in the book work fine until this one. I checked the SD card its FAT 32, exchanged SD card holder, used
SPI_BUS = 0, SCK_PIN = 2, MOSI_PIN = 3, MISO_PIN = 4, CS_PIN = 5 and
SPI_BUS = 1, SCK_PIN = 10, MOSI_PIN = 11, MISO_PIN = 12, CS_PIN = 13
The program start sbut it holds with the command:
os.mount(sd, SD_MOUNT_PATH)
I added print commands and so I know it holds here.
No idea to get this working. Any suggestions?

Question Tags: datalogging, Pico, Python, SD card

10 Answers

0 Vote Up Vote Down

Sara Santos Staff answered 1 year ago

Hi.
Have you tried powering your microSD card holder with 5V?
Some models require 5V to operate properly.

Regards,
Sara

0 Vote Up Vote Down

Dick van de Wetering answered 1 year ago

On the PCB it is printed 3V3, I am afraid to fry it if I connect it to 5V.

0 Vote Up Vote Down

Dick van de Wetering answered 1 year ago

I tested the SD Card reader with ESP32 and https://RandomNerdTutorials.com/esp32-microsd-card-arduino/SD_Test.

This was working. But with the Raspberry pi Pico no success yet.

0 Vote Up Vote Down

Sara Santos Staff answered 1 year ago

Hi again.
Please double-check the wiring.
It’s probably some issue with the circuit. Make sure you’re connecting to the right GPIOs.
Regards,
Sara

0 Vote Up Vote Down

Dick van de Wetering answered 1 year ago

Is it possible it has to do with the speed class of the SD card?
I also ordered another type of SD card reader. Hopefully it will work in the end.

0 Vote Up Vote Down

Sara Santos Staff answered 1 year ago

Hi.
I’m not sure. But, it’s worth trying another microSD card.
I know some readers have issues with specific microsd card types, but I’m not sure which ones exactly.
Regards,
Sara

0 Vote Up Vote Down

Dick van de Wetering answered 1 year ago

The Pico I tested with Arduino IDE and SD software, this was working OK.
Maybe the problem is somewhere in the pyhton software?

0 Vote Up Vote Down

Sara Santos Staff answered 1 year ago

I don’t think so.
I tested the program and it was working just fine.

So, I’m not really sure what might be happening in your case.

Regards,
Sara

0 Vote Up Vote Down

Dick van de Wetering answered 1 year ago

Today I received new SD cards, and the Pico is working now.
Old cards that did not work: Extreme Pro 16 GB Smart 1 U1
Cards that do work: Extreme Pro 32 GB A1 U1
and Scandisk Extreme 32GB A1 U3 V30
all car formatted FAT32
Regards, Dick

0 Vote Up Vote Down

Sara Santos Staff answered 1 year ago

Great.
Thanks for the follow-up.
I’ll mark this issue as resolved. If you need further help, you just need to open a new question in our forum.
Regards,
Sara