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  1. /*
  2.   SD card datalogger
  3.  
  4.   This example shows how to log data from three analog sensors
  5.   to an SD card using the SD library.
  6.  
  7.   The circuit:
  8.    analog sensors on analog ins 0, 1, and 2
  9.    SD card attached to SPI bus as follows:
  10.  ** MOSI - pin 11
  11.  ** MISO - pin 12
  12.  ** CLK - pin 13
  13.  ** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)
  14.  
  15.   created  24 Nov 2010
  16.   modified 9 Apr 2012
  17.   by Tom Igoe
  18.  
  19.   This example code is in the public domain.
  20.  
  21. */
  22.  
  23. #include <SPI.h>
  24. #include <SD.h>
  25.  
  26. const int chipSelect = 4;
  27.  
  28. void setup() {
  29.   // Open serial communications and wait for port to open:
  30.   Serial.begin(9600);
  31.   while (!Serial) {
  32.     ; // wait for serial port to connect. Needed for native USB port only
  33.   }
  34.  
  35.  
  36.   Serial.print("Initializing SD card...");
  37.  
  38.   // see if the card is present and can be initialized:
  39.   if (!SD.begin(chipSelect)) {
  40.     Serial.println("Card failed, or not present");
  41.     // don't do anything more:
  42.     while (1);
  43.   }
  44.   Serial.println("card initialized.");
  45. }
  46.  
  47. void loop() {
  48.   // make a string for assembling the data to log:
  49.   String dataString = "";
  50.  
  51.   // read three sensors and append to the string:
  52.   for (int analogPin = 0; analogPin < 3; analogPin++) {
  53.     int sensor = analogRead(analogPin);
  54.     dataString += String(sensor);
  55.     if (analogPin < 2) {
  56.       dataString += ",";
  57.     }
  58.   }
  59.  
  60.   // open the file. note that only one file can be open at a time,
  61.   // so you have to close this one before opening another.
  62.   File dataFile = SD.open("datalog.txt", FILE_WRITE);
  63.  
  64.   // if the file is available, write to it:
  65.   if (dataFile) {
  66.     dataFile.println(dataString);
  67.     dataFile.close();
  68.     // print to the serial port too:
  69.     Serial.println(dataString);
  70.   }
  71.   // if the file isn't open, pop up an error:
  72.   else {
  73.     Serial.println("error opening datalog.txt");
  74.   }
  75. }
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