Inconsistent SD card initialization

Other Hardware Storage
1

I can't consistently initialize SD card in my application. It randomly succeeds and fails.

I use Arduino Uno and SunFounder SD card reader.
SD card - 32G formatted as MS-DOS FAT

Here is the code

#include <Arduino.h>
#include <SD.h>

void setup() {
    Serial.begin(9600);
    if (!SD.begin(SPI_QUARTER_SPEED, 19)) {
        Serial.println("cannot initialize card");
    } else {
        Serial.println("looks good");
    }
}

void loop() {

}

I use analog pin as CS.

I don't have any capacitors, resistors etc in the schema. How can I investigate what is going on there? How to fix it?

2

Did u read the very first post in this section?

  • check cables.. (replace)
  • try with other card
3

Yes I did,

Even with non-OS formatting, sd initialization is not consistent. I used recommended formatter an the same results.