Do it yourself-1

Reading Temperature- Humidity DHT-11 Sensor using Arduino Uno

by
Likith. R - BCA 2nd YEAR, NCMS

Components Required 

• Arduino UNO & Genuino UNO

• DHT11 Temperature & Humidity Sensor (3 pins)

• Jumper wires (generic)

• Breadboard (generic)

• Arduino UNO USB 2.0 Cable 2.0

Circuit

Steps 

Step 1: place the DHT11 sensor on the bread board.

• Step 2: connect the DHT11 sensor by using jumper wires as follows to the Arduino uno board.

• i> connect the 5v to the +ve pin of sensor using male to male jumper wire.

• ii> connect the A0 to the OUT pin of Sensor by male to male jumper wire.

• iii> leave the 3rd pin free.

• iv> connect the -ve pin to the ground using male to male jumper wire.

• Step 3: upload the code to the Arduino uno board.

• step 4: you will be able to view the temperature and humidity in tools > serial monitor or press ctrl+shift+M.

Code:

#include <dht.h>

#define dht_apin A0 // Analog Pin sensor is connected to

dht DHT;

void setup(){

  Serial.begin(9600);

  delay(500);//Delay to let system boot

  Serial.println("DHT11 Humidity & temperature Sensor\n\n");

  delay(1000);//Wait before accessing Sensor

}//end "setup()"

void loop(){

  //Start of Program 

    DHT.read11(dht_apin);

    

    Serial.print("Current humidity = ");

    Serial.print(DHT.humidity);

    Serial.print("%  ");

    Serial.print("temperature = ");

    Serial.print(DHT.temperature); 

    Serial.println("C  ");

    

    delay(5000);//Wait 5 seconds before accessing sensor again.

  //Fastest should be once every two seconds.

}// end loop()

Link to download dht library - https://www.brainy-bits.com/dht11-tutorial/

Result