IoTerrific Data logging

1#include <SPI.h>
2#include <SD.h>
3#include <DHT.h>
4#include <DHT_U.h>
5
6DHT dht(0, DHT22);
7
8const int chipSelect = SDCARD_SS_PIN;
9
10void setup() {
11  // Open serial communications and wait for port to open:
12  Serial.begin(9600);
13  while (!Serial) {
14    ; // wait for serial port to connect. Needed for native USB port only
15  }
16
17
18  Serial.print("Initializing SD card...");
19
20  // see if the card is present and can be initialized:
21  if (!SD.begin(chipSelect)) {
22    Serial.println("Card failed, or not present");
23    // don't do anything more:
24    while (1);
25  }
26  Serial.println("card initialized.");
27  dht.begin();
28}
29
30void loop() {
31  // make a string for assembling the data to log:
32  String dataString = "";
33  // Saves the temperature in a variable
34  float temperature = dht.readTemperature();
35
36  dataString = String(temperature);
37
38  // open the file. note that only one file can be open at a time,
39  // so you have to close this one before opening another.
40  File dataFile = SD.open("datalog.txt", FILE_WRITE);
41
42  // if the file is available, write to it:
43  if (dataFile) {
44    dataFile.println(dataString);
45    dataFile.close();
46    // print to the serial port too:
47    Serial.println(dataString);
48  }
49  // if the file isn't open, pop up an error:
50  else {
51    Serial.println("error opening datalog.txt");
52  }
53  delay(1000);
54}