Example sketch

examples/DHTtester/DHTtester.pde

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+// Example testing sketch for various DHT humidity/temperature sensors
+// Written by ladyada, public domain
+
+#include "DHT.h"
+
+#define DHTPIN 2     // what pin we're connected to
+
+// Uncomment whatever type you're using!
+//#define DHTTYPE DHT11   // DHT 11 works
+#define DHTTYPE DHT22   // DHT 22  (AM2302)
+//#define DHTTYPE DHT21   // DHT 21 (AM2301)
+
+// Connect pin 1 (on the left) of the sensor to +5V
+// Connect pin 2 of the sensor to whatever your DHTPIN is
+// Connect pin 4 (on the right) of the sensor to GROUND
+
+DHT dht(DHTPIN, DHTTYPE);
+
+void setup() {
+  Serial.begin(9600); 
+  Serial.println("DHTxx test!");
+ 
+  dht.begin();
+}
+
+void loop() {
+  // Reading temperature or humidity takes about 250 milliseconds!
+  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+  float h = dht.readHumidity();
+  float t = dht.readTemperature();
+
+  // check if returns are valid, if they are NaN (not a number) then something went wrong!
+  if (isnan(t) || isnan(h)) {
+    Serial.println("Failed to read from DHT");
+  } else {
+    Serial.print("Humidity: "); 
+    Serial.print(h);
+    Serial.print(" %\t");
+    Serial.print("Temperature: "); 
+    Serial.print(t);
+    Serial.println(" *C");
+  }
+}