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- #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");
- }
- }
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