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Author Topic: SD Card fails to connect
Posts: 1
Post SD Card fails to connect
on: January 11, 2016, 01:51

I have unsuccessfully tried making so I can connect to a micro USB for the last day.

To try and narrow down the problem I copied the SD connect code into an empty Arduino project like so.

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

const int chipSelect = 4;

bool cardPresent = false;
bool cardInit = false;
File root;

void setup()
 // Open serial communications and wait for port to open:
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  pinMode(chipSelect, OUTPUT); // necessary for SD card reading to work

  // see if the card is present and can be initialized:
  int initValue = 0;
  initValue = SD.begin(chipSelect);
  if (initValue == 0) {
    Serial.println("Card failed, or not present");
  else {
    Serial.println("Successfully beginned.");
    cardPresent = true;
  if (cardPresent) {
    Serial.println("card initialized.");
    root ="/", FILE_READ);
    cardInit = true;

void loop(){

This works fine and prints the following message to the Serial.

Successfully beginned
card initialized

However, this exact same code in the main code (The polagraph one) DOES not work and I get the following message.

Card failed, or not present

Does anybody have the same problem? Am I doing something wrong?

Posts: 1449
Post Re: SD Card fails to connect
on: January 11, 2016, 20:58

Who can say? If you'd said what kind of hardware you have, which polargraph firmware you copied from then perhaps we could start to make a guess.

When asking for help, please have a think about whether you have supplied enough information to allow us to help.


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