ESP32 - SD Card

by DIYables in Circuits > Microcontrollers

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ESP32 - SD Card

This is a compact build guide. The full tutorial, with the wiring diagram and a line-by-line walkthrough of the code, is here: https://esp32io.com/tutorials/esp32-sd-card

In this guide, we'll explore how to use a Micro SD Card with the ESP32. We'll delve into the following topics:

Supplies

Everything below is what the build uses. The links go to the parts we make and test.

  1. 38-pin ESP32 ESP-WROOM-32 Dev Module - Narrow
  2. 38-pin ESP32 ESP-WROOM-32 Dev Module - Wide
  3. 30-pin ESP32 ESP-WROOM-32 Dev Module - Wide
  4. ESP32 Uno-form board
  5. ESP32 S3 Uno-form board
  6. USB Cable Type-A to Type-C (for USB-A PC)
  7. USB Cable Type-C to Type-C (for USB-C PC)
  8. Micro SD Card
  9. Micro SD Card Module
  10. Jumper Wires
  11. Breadboard
  12. MicroSD to SD Memory Card Adapter
  13. Screw Terminal Expansion Board for ESP32
  14. Breakout Expansion Board for ESP32
  15. Power Splitter for ESP32
  16. DIYables ESP32 Starter Kit (ESP32 included)
  17. DIYables ESP32 S3 Starter Kit (ESP32 S3 included)
  18. DIYables Sensor Kit (18 sensors/displays)

What It Is

The Micro SD Card Module can interface with ESP32 and it can carry a Micro SD Card. In another word, the Micro SD Card Module is a bridge between ESP32 and Micro SD Card

Wiring

Micro SD Card Module includes 6 pins:

VCC pin: connect to the ESP32's 5V pin.

GND pin: connect this pin to the ESP32's GND.

MISO pin: (Master In Slave Out) connect this pin to the ESP32's MISO pin.

Code

esp32-sd-card.ino - the sketch from the tutorial, unchanged.

/*
* This ESP32 code is created by esp32io.com
*
* This ESP32 code is released in the public domain
*
* For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-sd-card
*/

#include <SD.h>

#define PIN_SPI_CS 5 // The ESP32 pin GPIO5

File myFile;

void setup() {
Serial.begin(9600);

if (!SD.begin(PIN_SPI_CS)) {
while (1) {
Serial.println(F("SD CARD FAILED, OR NOT PRESENT!"));
delay(1000);
}
}

Serial.println(F("SD CARD INITIALIZED."));

if (!SD.exists("/esp32.txt")) {
Serial.println(F("esp32.txt doesn't exist. Creating esp32.txt file..."));
// create a new file by opening a new file and immediately close it
myFile = SD.open("/esp32.txt", FILE_WRITE);
myFile.close();
}

// recheck if file is created or not
if (SD.exists("/esp32.txt"))
Serial.println(F("esp32.txt exists on SD Card."));
else
Serial.println(F("esp32.txt doesn't exist on SD Card."));
}

void loop() {
}

Full Tutorial

The complete tutorial, wiring diagram and code explanation: https://esp32io.com/tutorials/esp32-sd-card