#include <SPI.h>
#include <SD.h>
const int chipSelect = 4;
unsigned int i;
void setup() {
//Serial.begin(9600);
pinMode(13,0);
Serial.print("Initializing SD card...");
pinMode(10, OUTPUT);
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
return;
}
Serial.println("card initialized.");
}
void loop() {
int mq7 = analogRead(1);
File dataFile = SD.open("datalog.txt", FILE_WRITE);
if(dataFile) {
if(i==0){
//dataFile.println("mq7:");
}
dataFile.println(mq7);
dataFile.close();
delay(500);
}
else {
Serial.println("error opening datalog.txt");
}
}