DHT11 Temperature and Humidity Sensor Arduino Code with LCD Display
Hello friends! Welcome back to ElectroDuino. This blog is based on DHT11 Temperature and Humidity Sensor Arduino Code with LCD Display. Here we will discuss Introduction Temperature and Humidity Monitoring System, Circuit diagram, Working and DHT11 Temperature and Humidity sensor Arduino Code with LCD Display.
Introduction
In the previous blog posts, we were learning about the “DHT11 Temperature and Humidity Sensor Module” and “Interfacing DHT11 with Arduino”. In this project, we will discuss how to make a Temperature and Humidity Monitoring System. Where we will print the Temperature and Humidity value on a 16×2 LCD display using DHT11 and Arduino. DHT11 is the cheapest humidity and temperature sensor, it provides high reliability and long-term stability output. This is a very small and portable Temperature and Humidity Monitoring system so we can use it at home, office, school, etc. places. It gives us the Temperature and Humidity value of around it 24 x7. Here we will build this system and learn how to write the DHT11 Temperature and Humidity Sensor Arduino Code with LCD Display.
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Components Required
Components Name | Quantity |
Arduino UNO (you can use other types of Arduino like Arduino Nano, MEGA, pro mini, etc) | 1 |
Arduino USB Cable (USB A to B) | 1 |
DHT11 Temperature and Humidity Sensor Module | 1 |
16×2 LCD Display Module | 1 |
10k Potentiometer | 1 |
220 ohm Resistor | 1 |
Slide Switch (SW1) | 1 |
9V Power Supply | |
Connecting wires | As required in the circuit diagram |
Circuit Diagram of DHT11 Temperature and Humidity Sensor Arduino with LCD Display
![DHT11 Temperature and Humidity Sensor Arduino with LCD Display Circuit Diagram](https://www.electroduino.com/wp-content/uploads/2021/01/DHT11-Temperature-and-Humidity-Sensor-Arduino-with-LCD-Display-Circuit-Diagram.jpg)
Circuit Wiring
Components Pin | Arduino pin |
DHT11 sensor VCC pin, LCD Display (Vdd, LED +) Pins | Arduino 5V Pin, but LCD Display LED + Pins connected to Arduino 5V Pin through 220ohm resistor. |
DHT11 sensor GND pin, LCD Display (Vss, Rw and LED -) Pins | GND (ground) Pin |
DHT11 sensor DATA pin | Digital Pin “D3” |
LCD Display RS, E, D4, D5, D6, D7 | Respectively Digital Pin “D12”, “D11”, “D10”, “D9”, “D8”, “D7” |
LCD Display V0 pin | 10k Potentiometer Signal pin, Potentiometer one pin is connected to 5V and another pin is connected to GND(ground) |
9v battery positive (+) terminal | Connected to Arduino “Vin” pin through a slide switch |
9v battery negative (–) terminal | GND (ground) Pin |
Library Required :
Before writing the Arduino Code we need to install two Libraries in our Arduino IDE Software, one is ” dht.h ” DHT11 sensor Library and Another one is “LiquidCrystal.h” 16×2 LCD Display Library You can Download the Library file by click on the Download Button.
Download ” dht.h ” DHT11 sensor Library: Download LiquidCrystal.h” 16×2 LCD Display Library:
Open the Arduino IDE, go to Sketch > Include Library > Add .ZIP Library, and then select the Library ZIP file that you just downloaded.
DHT11 Temperature and Humidity Sensor Arduino Code with LCD Display
/* Interfacing DHT11 with Arduino DHT11 Temperature and Humidity sensor Arduino Code WWW.Electroduino.com */ //libraries for LCD Display #include <LiquidCrystal.h> // Define LCD display pins LiquidCrystal lcd(12,11,10,9,8,7); #include <dht.h> // Include DHT11 library #define DATApin 2 // Defines Arduino pin which is connected to the sensor dht DHT; // Creates a DHT object void setup() { //Sets the baud for serial data transmission between Arduino and your computer Serial.begin(9600); // Print massage on LCD Display lcd.clear(); lcd.begin(16, 2); lcd.setCursor(0,0); lcd.print("Temp and Humi"); lcd.setCursor(0,1); lcd.print("Monitoring System"); delay(2000); } void loop() { // Read data from Sensor int readData = DHT.read11(DATApin); float t = DHT.temperature; // Read Temperature in Degree Celsius unit float h = DHT.humidity; // Read humidity //Print Tempareture Value on Serial Monitor Window Serial.print("Temperature = "); Serial.print(t); // Temperature value in Degree Celsius Serial.print("°C"); //Print Humidity Value on Serial Monitor Window Serial.print("Humidity = "); Serial.print(h); Serial.println("% "); Serial.println(""); lcd.clear(); //Print Tempareture Value on LCD Display lcd.setCursor(0, 0); // start to print at the first row lcd.print("Temp: "); lcd.print(t); // print the temperature lcd.print((char)223); // print ° character lcd.print("C"); //Print Humidity Value on LCD Display lcd.setCursor(0, 1); // start to print at the second row lcd.print("Humi: "); lcd.print(h); // print the humidity lcd.print("%"); delay(2000); // wait two seconds }