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Author Topic: Data logging sd write failure  (Read 517 times)
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Hello everybody.
I am new on arduino
i purchase lcd screen,sd card module and an dht 11 sensor
i have made this code from all projects smiley
Code:
// include the SD library:
#include <SPI.h>
#include <SD.h>
#include <LiquidCrystal.h>
#include <dht11.h>
#define DHT11PIN 2
// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;

// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
const int chipSelect = 4;
LiquidCrystal lcd(5,6,7,8,9,10);
dht11 DHT11;
File myFile;

void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  lcd.begin(16, 2);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  myFile = SD.open("test.txt", FILE_WRITE);
  Serial.print("\nInitializing SD card...");
  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
  // Note that even if it's not used as the CS pin, the hardware SS pin
  // (10 on most Arduino boards, 53 on the Mega) must be left as an output
  // or the SD library functions will not work.
  pinMode(10, OUTPUT);     // change this to 53 on a mega


  // 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 is inserted?");
    Serial.println("* Is your wiring correct?");
    Serial.println("* did you change the chipSelect pin to match your shield or module?");
    return;
  } else {
    Serial.println("Wiring is correct and a card is present.");
  }

  // print the type of card
  Serial.print("\nCard type: ");
  switch (card.type()) {
    case SD_CARD_TYPE_SD1:
      Serial.println("SD1");
      lcd.print("SD1 ");
      break;
    case SD_CARD_TYPE_SD2:
      Serial.println("SD2");
      lcd.print("SD2 ");
      break;
    case SD_CARD_TYPE_SDHC:
      Serial.println("SDHC");
      lcd.print("SDHC ");
      break;
    default:
      Serial.println("Unknown");
      lcd.print("NaN ");
  }

  // 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");
    return;
  }
  //Dht11 Data Logg
  myFile = SD.open("test.txt", FILE_WRITE);
  // print the type and size of the first FAT-type volume
  uint32_t volumesize;
  Serial.print("\nVolume type is FAT");
  Serial.println(volume.fatType(), DEC);
  lcd.print("FAT");
  lcd.print(volume.fatType(), DEC);
  Serial.println();

  volumesize = volume.blocksPerCluster();    // clusters are collections of blocks
  volumesize *= volume.clusterCount();       // we'll have a lot of clusters
  volumesize *= 512;                            // SD card blocks are always 512 bytes
  Serial.print("Volume size (bytes): ");
  Serial.println(volumesize);
  Serial.print("Volume size (Kbytes): ");
  volumesize /= 1024;
  Serial.println(volumesize);
  Serial.print("Volume size (Mbytes): ");
  volumesize /= 1024;
  Serial.println(volumesize);
  lcd.print(" ");
  lcd.print(volumesize);
  lcd.print("MB");
 

  Serial.println("\nFiles found on the card (name, date and size in bytes): ");
  root.openRoot(volume);
  root.ls(LS_R | LS_DATE | LS_SIZE);
 
  // Bir satır boşluk bırakıyoruz serial monitörde.
  Serial.println("\n");

  int chk = DHT11.read(DHT11PIN);
 
 
  // Sensörden gelen verileri serial monitörde yazdırıyoruz.
  if (myFile) {
  Serial.print("Nem (%): ");
  myFile.println();
  lcd.setCursor(0, 1);
  lcd.print("H:");
  lcd.print((float)DHT11.humidity, 2);
  myFile.print((float)DHT11.humidity, 2);
  Serial.println((float)DHT11.humidity, 2);

  Serial.print("Sicaklik (Celcius): ");
  lcd.print(" T:");
  lcd.print((float)DHT11.temperature, 2);
  myFile.print((float)DHT11.temperature, 2);
  lcd.print("C");
  Serial.println((float)DHT11.temperature, 2);

  Serial.print("Sicaklik (Fahrenheit): ");
  Serial.println(DHT11.fahrenheit(), 2);
 
  myFile.close();
   } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }

  delay(500);


}
 

void loop() {

}

but it cant write. i have tried 2 cards. lcd screen works but cant write to sd.
when i plug to computer,it seems to empty
formatted to : FAT

i tried read/write example and it is working. but my project isnt working ?
how i can fix it
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You did not start the SD. Add SD.begin(4) to your setup.
Code:
void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  lcd.begin(16, 2);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  Serial.print(F("Starting SD..."));
  if(!SD.begin(4)) Serial.println(F("failed");
  else Serial.println(F("ok"));

  myFile = SD.open("test.txt", FILE_WRITE);
  // rest of your setup code
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Thanks. It works
i have fix problem
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