1. #define DHTTYPE DHT22  
2. const int chipSelect = 10;
3. const int DHTvcc = 6;
4. const int DHTdat = 5;
5. const int DHTgnd = 3;
6.  
7.  
8. const int timeRate = 5;
9.  
10. #include <dht.h>
11. #include <SdFat.h>
12.  
13. dht DHT;
14. double DHTtemp , DHThumid;
15. int DHTread;
16.  
17. SdFat sd;
18. SdFile logFile;
19.  
20. void setup() {
21.   // setup IO pins to power DHT11 / DHT22 sensor
22.   pinMode (DHTdat, INPUT_PULLUP);
23.   pinMode (DHTvcc, OUTPUT);
24.   pinMode (DHTgnd, OUTPUT);
25.   digitalWrite(DHTvcc, HIGH);
26.   digitalWrite (DHTgnd, LOW);
27.  
28.   Serial.begin(57600);
29.   Serial.println("Pomiar temperatury i wilgotnosci z zapisem na karte SD");
30.   Serial.println("Dane zapisywane do log.csv na karcie MicroSD");
31.  
32.   delay(2000);
33.   DHTread = DHT.read22(DHTdat);
34.   switch (DHTread) {
35.     case DHTLIB_OK: Serial.println("Sensor OK.");
36.       break;
37.     default: Serial.println("ERROR: Problem z sensorem nie wykryto.");
38.   }
39.   `
40.   if (!sd.begin(chipSelect)) {
41.     Serial.println("ERROR karty SD .");
42.   } else {
43.     Serial.println("Karta SD ok!");
44.   }
45. }
46.  
47. void loop() {
48.   delay(timeRate * 1000);
49.   if (!logFile.open("log.csv", O_RDWR | O_CREAT | O_AT_END)) {
50.     sd.errorHalt("Blad pliku log.csv");
51.   } else {
52.     Serial.print("zapis danych. ");
53.   }
54.   DHTread = DHT.read22(DHTdat);
55.   DHTtemp = DHT.temperature;  
56.   DHThumid = DHT.humidity;
57.   Serial.print("Temperatura: ");
58.   Serial.print(DHTtemp); Serial.print("C ");
59.   Serial.print(" Wilgotnosc: "); Serial.print(DHThumid);
60.     Serial.println("%");
61.   logFile.print(" Temperatura: ");logFile.print(DHTtemp); logFile.print(" C"); logFile.print(","); logFile.print(" Wilgotność  : "); logFile.println(DHThumid);logFile.print(" %"); // write data
62.   logFile.close();
63. }