DHT11 Humidity and Temperature sensor tutorial using Arduino

Overview

In this video tutorial, we will learn how to interfacing dht11 sensor with Arduino. Also, the real-time humidity and temperature value show on Lcd display. 

You can watch the following video below:-

Components Required

The required components list for this project given below:-

• Arduino Uno
• DHT11 Humidity Sensor Module
• 16*2 Lcd Display 
• 10k Potentiometer
• 220-ohm Resistor
• Breadboard
• Some Jumper Wire

Pinout

Circuit Schematic

The circuit diagram of the dht11, Lcd display and Arduino interfacing below:-

Fig: DHT11 interfacing with Arduino 

Circuit Description

Source Code

The source code is given below:-

 #include <Adafruit_Sensor.h>  
 #include <DHT.h>  
 #include <DHT_U.h>  
 #include <LiquidCrystal.h>  
 const int rs = 2, en = 3, d4 = 4, d5 = 5, d6 = 6, d7 = 7;  
 LiquidCrystal lcd(rs, en, d4, d5, d6, d7);  
   
 #define DHTPIN      10     // Pin which is connected to the DHT sensor.  
   
 #define DHTTYPE      DHT11   // DHT 11   
   
 DHT_Unified dht(DHTPIN, DHTTYPE);  
   
 uint32_t delayMS;  
   
 void setup() {  
  Serial.begin(9600);   
  lcd.begin(16, 2);  
  // Initialize device.  
  dht.begin();  
  Serial.println("DHTxx Unified Sensor Example");  
  // Print temperature sensor details.  
  sensor_t sensor;  
  dht.temperature().getSensor(&sensor);  
    
  dht.humidity().getSensor(&sensor);  
   
  delayMS = sensor.min_delay / 1000;  
   
  lcd.setCursor(0, 0);  
  lcd.print("Calibrating");  
   for(int i = 0; i <10; i++){  
    if (i==4)  
    {  
      lcd.setCursor(0, 1);  
      lcd.print(".");  
     }  
     else lcd.print(".");  
    delay(500);  
    }  
   lcd.setCursor(5, 1);  
   lcd.print("done");  
   delay(1000);  
   lcd.clear();   
   lcd.setCursor(1, 0);  
   lcd.print("SENSOR ACTIVE");  
   delay(1500);  
    
 }  
   
 void loop() {  
  // Delay between measurements.  
  delay(delayMS);  
  lcd.clear();  
  // Get temperature event and print its value.  
  sensors_event_t event;   
  dht.temperature().getEvent(&event);  
  if (isnan(event.temperature)) {  
   Serial.println("Error reading temperature!");  
  }  
  else {  
   lcd.setCursor(0, 0);  
   lcd.print("Temp : ");  
   Serial.print("Temperature: ");  
   Serial.print(event.temperature);  
   lcd.print(event.temperature);  
   Serial.println(" *C");  
   lcd.write(0xdf);   // for dgree sign  
   lcd.print("C ");  
  }  
  // Get humidity event and print its value.  
  dht.humidity().getEvent(&event);  
  if (isnan(event.relative_humidity)) {  
   Serial.println("Error reading humidity!");  
  }  
  else {  
   lcd.setCursor(0, 1);  
   lcd.print("Humidity: ");  
   Serial.print("Humidity: ");  
   Serial.print(event.relative_humidity);  
   lcd.print(event.relative_humidity);  
   lcd.print("%");  
   Serial.println("%");    
  }  
  }  

You can download the library from here:-