Using Adafruit PiCowbell Adalogger for Pico - MicroSD, RTC & STEMMA QT

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Continuing on with my temperature logging project as mentioned here, I have my Raspberry Pi Pico connected to an Adafruit PiCowbell Adalogger for Pico - MicroSD, RTC & STEMMA QT, and I’m having trouble with the sdcard slot in the PiCowbell.

Adafruit’s page for the PiCowbell is using CircuitPython, and it’s a whole different set of libraries to mess about with, so I was hoping to use the Makerverse Micro SD Adapter - MicroPython Guide and Data Logging

I have the basic test code from that tutorial modified to use the Adalogger’s pinouts for its SDCard:

from machine import SPI, Pin
import sdcard, uos

spi = SPI(0,sck=Pin(18), mosi=Pin(19), miso=Pin(16))
cs = Pin(17)
sd = sdcard.SDCard(spi, cs)

uos.mount(sd, '/sd')
print(uos.listdir('/sd'))

Which is running happily up until it tries to mount the card:

MPY: soft reboot
Traceback (most recent call last):
  File "<stdin>", line 8, in <module>
OSError: [Errno 19] ENODEV

Just wondering if anyone who has used the PiCowbell datalogger in a micropython project and gotten the sdcard working might be able to share some working code?

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I did find this post where someone was askinig for help with the same error code, and they fixed their issue by switching to a fat32 formatted 32GB SDcard. I was using a 64GB sdcard, so I re-formatted a 16GB sdcard as fat32 and stored a single empty file on it called “success”, but I still get the ENODEV error.

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Well, I found an older 2GB SDCard, and that is working! SDCard compatibility is a mess!

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What a trap!
I’m not too familiar with CircuitPython so I do wonder how well the Makerverse driver (vanilla MicroPython) works on a Pico running CircuitPython.

16GB does feel like a safer size in general - i start hearing alarm bells when I consider an embedded microcontroller project using a 64GB uSD card.

Glad you’re back on track, and thanks for taking the time to document your findings! It helps everybody in the end :slight_smile:

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Yep, nothing more annoying that finding a post with the exact same question as you have and finding there’s no definite answer!

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For anyone trying to use this board in Micropython, there’s code for all the features in this project

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