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 
// 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 sat?r bo?luk b?rak?yoruz serial monitörde.
Serial.println("\n");
int chk = DHT11.read(DHT11PIN);
// Sensörden gelen verileri serial monitörde yazd?r?yoruz.
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
