document.write('
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  1.  
  2. #include <SPI.h>
  3. #include <SD.h>
  4.  
  5. const int chipSelect = 4;
  6. unsigned int i;
  7.  
  8. void setup() {
  9.  
  10. //Serial.begin(9600);
  11.  
  12. pinMode(13,0);
  13.  
  14. Serial.print("Initializing SD card...");
  15. pinMode(10, OUTPUT);
  16.  
  17.  
  18. if (!SD.begin(chipSelect)) {
  19. Serial.println("Card failed, or not present");
  20. return;
  21. }
  22. Serial.println("card initialized.");
  23. }
  24.  
  25. void loop() {
  26.  
  27. int mq7 = analogRead(1);
  28.  
  29.  
  30. File dataFile = SD.open("datalog.txt", FILE_WRITE);
  31.  
  32. if(dataFile) {
  33. if(i==0){
  34. //dataFile.println("mq7:");
  35. }
  36.  
  37. dataFile.println(mq7);
  38. dataFile.close();
  39. delay(500);
  40.  
  41. }
  42.  
  43. else {
  44. Serial.println("error opening datalog.txt");
  45. }
  46.  
  47. }
');