Interfacing Temperature and Humidity Sensor DHT11

 Interfacing DHT11 with Arduino

Library used: DHT11 by Dhruba Saha

Example Code 1 (Serial Monitor):

#include <DHT11.h>
DHT11 dht11(7);  // Connect DHT11 to pin 7 of Arduino UNO
int temperature=0;
int humidity=0;
void  setup()
{
   Serial.begin(9600);
}
void loop()
{
   Serial.println();
   int result = dht11.readTemperatureHumidity(temperature, humidity);
 
   if (result == 0) {
      Serial.print("Temperature: ");
      Serial.print(temperature);
      Serial.print(" °C\tHumidity: ");
      Serial.print(humidity);
      Serial.println(" %");
   } else {
   // Print error message based on the error code.
      Serial.println(DHT11::getErrorString(result));
   }
  delay(2000);
}

Working Video (LCD):

Example Code 2 (LCD):

#include <DHT11.h>

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

DHT11 dht11(7);  // Connect DHT11 to pin 7 of Arduino UNO

LiquidCrystal_I2C lcd(0x27,16,2);

int temperature=0;

int humidity=0;

void  setup()

{

   lcd.init();

   lcd.backlight();

}

void loop()

{

   lcd.clear();

   int result = dht11.readTemperatureHumidity(temperature, humidity);

 

   if (result == 0) {

    lcd.setCursor(0,0);

      lcd.print("Temp: ");

      lcd.print(temperature);

      lcd.print(" C");

      lcd.setCursor(0,1);

      lcd.print("Humidity: ");

      lcd.print(humidity);

      lcd.print("%");

      delay(1000);

   } else {

   // Print error message based on the error code.

      lcd.println(DHT11::getErrorString(result));

      delay(2000);

   }

}