Hi all, I'd like some help trying to diagnose a problem I'm having with using a Micro SD Card Module with the Arduino Uno.
I'm running the CardInfo.ino script to check if everything is set up correctly, but it keeps stating that "Initializing SD card... initialization failed". I'm using an 8GB SDHC Micro SD card that should be formatted to FAT32 (using Windows Default Formatter), with each of the five Micro SD Card readers that came from this purchase ( amazon.com/DAOKAI-Module-Adapter-Expansion-Arduino/dp/B09YYG6BT3/ref=sr_1_2?crid=2R2CJ29L6UPGC&dib=eyJ2IjoiMSJ9.7GRbcG2HpUEegcWfWZCe4yPSQLVIfd__ugLu8zFhCCDSacGY0CMVl5lasihydBi4yOOQXYjn5sWkuPeazgePu_ibjZOVVcyMmDEbIw19Z8y2u8ZNldCOGCV7CXyeVZkuBh69zI36WpOShPMfFxCrtjmPY33i5CyK8vLu5jQh_x4-3i01SgfkfQQ9I4_r4BLguC11Xn4aoA--Hocj4ihHQDkl4vSUSep54Onbt984qLREWix8Zt69vq22EaDOVwwe35eWVT4sQd21jC2oQU9WHReRvFUDH2nk2j2D5oiXRiE.mO6S-ctS7G4-6exult6TmvZYAnUBJpFlwmWWgs7LBNU&dib_tag=se&keywords=micro+sd+card+module+arduino&qid=1725238470&s=industrial&sprefix=micro+sd+card+module+arduino%2Cindustrial%2C114&sr=1-2.
The Arduino Uno I have uploaded the script below (CardInfo.ino) without any issues, and has been working correctly for many other scripts:
/*
SD card test
This example shows how use the utility libraries on which the
SD library is based in order to get info about your SD card.
Very useful for testing a card when you're not sure whether its working or not.
Pin numbers reflect the default SPI pins for Uno and Nano models.
The circuit:
SD card attached to SPI bus as follows:
** SDO - pin 11 on Arduino Uno/Duemilanove/Diecimila
** SDI - pin 12 on Arduino Uno/Duemilanove/Diecimila
** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
** CS - depends on your SD card shield or module.
Pin 10 used here for consistency with other Arduino examples
created 28 Mar 2011
by Limor Fried
modified 24 July 2020
by Tom Igoe
*/
// include the SD library:
#include <SPI.h>
#include <SD.h>
// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;
// change this to match your SD shield or module;
// Default SPI on Uno and Nano: pin 10
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
// MKR Zero SD: SDCARD_SS_PIN
const int chipSelect = 10;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("\nInitializing SD card...");
// we'll use the initialization code from the utility libraries
// since we're just testing if the card is working!
if (!card.init(SPI_HALF_SPEED, chipSelect)) {
Serial.println("initialization failed. Things to check:");
Serial.println("* is a card inserted?");
Serial.println("* is your wiring correct?");
Serial.println("* did you change the chipSelect pin to match your shield or module?");
Serial.println("Note: press reset button on the board and reopen this Serial Monitor after fixing your issue!");
while (1);
} else {
Serial.println("Wiring is correct and a card is present.");
}
// print the type of card
Serial.println();
Serial.print("Card type: ");
switch (card.type()) {
case SD_CARD_TYPE_SD1:
Serial.println("SD1");
break;
case SD_CARD_TYPE_SD2:
Serial.println("SD2");
break;
case SD_CARD_TYPE_SDHC:
Serial.println("SDHC");
break;
default:
Serial.println("Unknown");
}
// Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
if (!volume.init(card)) {
Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
while (1);
}
Serial.print("Clusters: ");
Serial.println(volume.clusterCount());
Serial.print("Blocks x Cluster: ");
Serial.println(volume.blocksPerCluster());
Serial.print("Total Blocks: ");
Serial.println(volume.blocksPerCluster() * volume.clusterCount());
Serial.println();
// print the type and size of the first FAT-type volume
uint32_t volumesize;
Serial.print("Volume type is: FAT");
Serial.println(volume.fatType(), DEC);
volumesize = volume.blocksPerCluster(); // clusters are collections of blocks
volumesize *= volume.clusterCount(); // we'll have a lot of clusters
volumesize /= 2; // SD card blocks are always 512 bytes (2 blocks are 1 KB)
Serial.print("Volume size (KB): ");
Serial.println(volumesize);
Serial.print("Volume size (MB): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.print("Volume size (GB): ");
Serial.println((float)volumesize / 1024.0);
Serial.println("\nFiles found on the card (name, date and size in bytes): ");
root.openRoot(volume);
// list all files in the card with date and size
root.ls(LS_R | LS_DATE | LS_SIZE);
root.close();
}
void loop(void) {
}
Here's also a picture of my wiring with a breadboard, as well as written below:
(Micro SD, Arduino Uno)
3v3, 5V (also tried 3v3);
CS, D10 (also tried D4);
MOSI, D11;
CLK, D13;
MISO, D12;
Any help is appreciated! Hopefully this is a stupid mistake so I can get back to work.
