Remove serial.print from library and update example error handling. Resolves issue #11 and #13.

DHT.cpp

@@ -46,7 +46,6 @@ float DHT::readTemperature(bool S) {
       return f;
     }
   }
-  Serial.print("Read fail");
   return NAN;
 }
 
@@ -70,7 +69,6 @@ float DHT::readHumidity(void) {
       return f;
     }
   }
-  Serial.print("Read fail");
   return NAN;
 }
 

examples/DHTtester/DHTtester.ino

@@ -32,14 +32,17 @@ void loop() {
   float t = dht.readTemperature();
   // Read temperature as Fahrenheit
   float f = dht.readTemperature(true);
+  
+  // Check if any reads failed and exit early (to try again).
+  if (isnan(h) || isnan(t) || isnan(f)) {
+    Serial.println("Failed to read from DHT sensor!");
+    return;
+  }
+
   // Compute heat index
   // Must send in temp in Fahrenheit!
   float hi = dht.computeHeatIndex(f, h);
 
-  // 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");
@@ -51,6 +54,4 @@ void loop() {
   Serial.print("Heat index: ");
   Serial.print(hi);
   Serial.println(" *F");
-
-  }
 }