ESP32 Tutorial 40/55 - Reading and writing to Micro SD Card | SunFounder's ESP32 IoT Learnig kit

In this video we learn how to use ESP32 with SunFounder's Camera Extension board to read and write to microSD card. Code is fully explained.

Topics in this lesson

Use Chapters from timeline or click on the time

• 00:00 Introduction
• 1:45 Introduction to Micro SD card on ESP32
• 3:46 Docs page
• 4:43 Arduino Code
• 8:09 Selecting ESP32 Board and COM port in Arduino IDE
• 9:51 Demonstration of writing MicroSD Card
• 11:12 Viewing written files on PC

*/
ESP32 Tutorial 40/55 - Reading and writing to Micro SD Card | SunFounder's ESP32 IoT Learnig kit
Watch video instruction for this code on YouTube https://youtu.be/IoK1KvO2EwI
Resource page for this lesson and code:
http://robojax.com/course3
Tutoril by https://youTube.com/@robojax
*/
#include "SD_MMC.h"

void setup() {
  Serial.begin(115200); // Initialize serial communication
  if (!SD_MMC.begin()) { // Check if SD card is mounted successfully
    Serial.println("Failed to mount SD card"); // Print error message if SD card failed to mount
    return;
  }

  // Create a file in the root directory of SD card and open it in write mode.
  File file = SD_MMC.open("/test.txt", FILE_WRITE); 
  if (!file) {
    Serial.println("Failed to open file for writing"); // Print error message if file failed to open
    return;
  }
  if (file.println("Test file write")) { // Write a line of text to the file
    Serial.println("File write successful"); // Print success message if write operation is successful
  } else {
    Serial.println("File write failed"); // Print error message if write operation failed
  }
  file.close(); // Close the file

  File root = SD_MMC.open("/"); // Open the root directory of SD card
  if (!root) {
    Serial.println("Failed to open directory"); // Print error message if directory failed to open
    return;
  }
  Serial.println("Files found in root directory:"); // Print the list of files found in the root directory
  while (File file = root.openNextFile()) { // Loop through all the files in the root directory
    Serial.print("  ");
    Serial.print(file.name()); // Print the filename
    Serial.print("\t");
    Serial.println(file.size()); // Print the filesize
    file.close(); // Close the file
  }
}
void loop() {} // Empty loop function, does nothing