arduinoprojects

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DHT22Integer.ino (880B)

      1 #include <SimpleDHT.h>
      2 
      3 // for DHT22, 
      4 //      VCC: 5V or 3V
      5 //      GND: GND
      6 //      DATA: 2
      7 int pinDHT22 = 2;
      8 SimpleDHT22 dht22(pinDHT22);
      9 
     10 void setup() {
     11   Serial.begin(115200);
     12 }
     13 
     14 void loop() {
     15   // start working...
     16   Serial.println("=================================");
     17   Serial.println("Sample DHT22...");
     18   
     19   // read without samples.
     20   byte temperature = 0;
     21   byte humidity = 0;
     22   int err = SimpleDHTErrSuccess;
     23   if ((err = dht22.read(&temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
     24     Serial.print("Read DHT22 failed, err="); Serial.print(SimpleDHTErrCode(err));
     25     Serial.print(","); Serial.println(SimpleDHTErrDuration(err)); delay(2000);
     26     return;
     27   }
     28   
     29   Serial.print("Sample OK: ");
     30   Serial.print((int)temperature); Serial.print(" *C, ");
     31   Serial.print((int)humidity); Serial.println(" RH%");
     32   
     33   // DHT22 sampling rate is 0.5HZ.
     34   delay(2500);
     35 }