Introduction: How to Interface Humidity and Temperature (DHT11) Sensor to Arduino and Including DHT11 Library.

DTH11 includes both Humidity and Temperature sensor.

Hardware Components required:-

1) DTH11 Humidity and Temperature Sensor

2) Arduino UNO

3)Connecting Wires

4) DTH library

You can get the sensor DTH11 Data Sheet from the below link

Hardware Connections

DTH11 To Arduino

Vcc --- 5v


Data Pin --- 3rd Pin of Arduino

Step 1: How to Include DHT Library

Please download the DHT library from the below link.

Go to Sketch--> Include Library --> Add Zip File

As shown in the above screen shot please browse the ZIP file and include the library after including the library.

Close the Arduino IDE and open it again then you will find the library included.

Step 2: Program and Results


dht DHT;

// if you require to change the pin number, Edit the pin with your arduino pin.

#define DHT11_PIN 3

void setup() {


Serial.println("welcome to TechPonder Humidity and temperature Detector"); }

void loop() { // READ DATA

int chk = DHT.read11(DHT11_PIN);

Serial.println(" Humidity " );

Serial.println(DHT.humidity, 1);

Serial.println(" Temparature ");

Serial.println(DHT.temperature, 1);



Results are shown in above screen shots..