DHT11 sensor test code

dht11SensorWithArduino.ino

#include "DHT.h"
#define DHTPIN 10     // DHT sensor data pin connected to the Arduino

// Definer DHT sensor type
#define DHTTYPE DHT11   // DHT 11 
//#define DHTTYPE DHT22   // DHT 22  (AM2302)
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

int led = 9; // Connect led light to the Arduino digital pin 9

void setup() {
  pinMode(led, OUTPUT);
  Serial.begin(9600);
  Serial.println("Hello from DHT Sensor....!");
  dht.begin();
}

void loop() {
  // delay 2 seconds for collecting data
  delay(2000);

  // 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();
  // Read temperature as Celsius
  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);

  if (t >= 27) {
    digitalWrite(led, HIGH);
  } else {
    digitalWrite(led, LOW);
  }

  //  Serial.print("Humidity: ");
  //  Serial.print(h);
  //  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.println(led);
  //  Serial.print(f);
  //  Serial.print(" *F\t");
  //  Serial.print("Heat index: ");
  //  Serial.print(hi);
  //  Serial.println(" *F");
}