ESP32-SD CARD

ESP32-SD CARD

Aim:

To read the stored directories in SD card using ESP 32 microcontroller development board.

Description:

Interfacing SD card module with ESP 32 to list the directories stored in memory card.

Hardware required:

ESP32-Microcontroller Development board

Pin connection:

Pin Mapping:

SDCARD	ESP32
CS	IO5
MOSI	IO23
SCK	IO18
MISO	IO19

Procedure:

1.        The above pin connection shows how to interface SD Card with ESP32 board.

2.        Do the connections as shown in the pin diagram and pin mapping.

3.        Insert the SD Card in the slot given below the board.

4.        Connect the USB cable to the board.

5.        Open Arduino IDE .Select DOIT ESP32 DEVKIT V1in boards and select COM port.

6.        Verify the program and Upload it.

7.        Open the serial monitor to observe the output.

Program :

/*

Listfiles

This example shows how print out the files in a directory on a SD card The circuit:

* SD card attached to SPI bus as follows:

** MOSI - pin 11

** MISO - pin 12

** CLK - pin 13

** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)

created  Nov 2010 by David A. Mellis modified 9 Apr 2012 by Tom Igoe modified 2 Feb 2014 by Scott Fitzgerald

This example code is in the public domain.

*/ #include<SPI.h> #include<SD.h>

Fileroot;

void setup(void)

{

/* Open serial communications and wait for port to open: */

Serial.begin(9600);

/* wait for serial port to connect. Needed for native USB port only */ while(!Serial){

}

Serial.print("Initializing SD card...");

if(!SD.begin(4))

{

Serial.println("initialization failed!"); return;

}

Serial.println("initialization done."); root=SD.open("/"); printDirectory(root,0);

Serial.println("done!");

}

/*nothing happens after setup finishes */ void loop(void){

}

void print Directory(Filedir,intnumTabs){ while(true)

{

Fileentry= dir.openNextFile();

/* no more files */ if(!entry)

{

break;

}

for(uint8_ti=0;i<numTabs;i++)

{

Serial.print('\t');

}

Serial.print(entry.name()); if(entry.isDirectory()){ Serial.println("/"); printDirectory(entry,numTabs+1);

}

else

{

Serial.print("\t\t"); Serial.println(entry.size(),DEC);

}

entry.close();

}

}