Python For Microcontroller, Raspberry Pi

Write Read Data to SD Card Using Maker Pi Pico and CircuitPython

by Idris
February 2, 2021

CircuitPython, Raspberry Pi 400, Raspberry Pi Pico

MicroPython or CircuitPython? It's great to know both!

Introduction

Besides MicroPython, Raspberry Pi Pico can also be programmed using CircuitPython. You can read the differences between MicroPython and CircuitPython for Raspberry Pi Pico here ? MicroPython or CircuitPython? In this tutorial, we will try to write and read the data on the SD card using Maker Pi Pico.

Video

This tutorial shows how to write and read data to the SD card using Maker Pi Pico (Raspberry Pi Pico). It is programmed using CircuitPython.

Hardware Preparation

This is the list of items used in the video.

Maker Pi Pico

USB Micro B Cable

Phidisk Class10 U1 MicroSD – 32GB

Sample Program

This is the basic CircuitPython code to interface SD card using Maker Pi Pico (Raspberry Pi Pico).

from board import *

from time import *

import busio

import sdcardio

import storage

sleep(1)

spi = busio.SPI(GP10, MOSI=GP11, MISO=GP12)

cs = GP15

sd = sdcardio.SDCard(spi, cs)

vfs = storage.VfsFat(sd)

storage.mount(vfs, '/sd')

with open("/sd/pico.txt", "w") as file:

    file.write("1. Hello, world!\r\n")

with open("/sd/pico.txt", "a") as file:

    file.write("2. This is another line!\r\n")

with open("/sd/pico.txt", "a") as file:

    file.write("3. Last but not least!")

with open("/sd/pico.txt", "r") as file:

    print("Printing lines in file:")

    for line in file:

        print(line, end='')