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🌡 Temperature and Humidity Display on LCD using Arduino

This project demonstrates a temperature and humidity monitoring system using an Arduino, DHT sensor, and 16x2 LCD display.
The real-time temperature and humidity values are displayed on the LCD screen.

The project can be simulated using Wokwi.

🔗 Simulation Link

👉 Open Simulation

🔌 Circuit Diagram

👉 View Circuit Diagram

🔧 Components Required

  • Arduino Uno
  • DHT22
  • 16x2 LCD Display
  • 10kΩ Potentiometer (for LCD contrast)
  • Breadboard
  • Jumper Wires

🔌 Pin Connections

📍 DHT22 Connections

DHT22 Pin Arduino Pin
VCC 5V
GND GND
DATA D2

📍 LCD (16x2) Connections (4-bit Mode)

LCD Pin Arduino Pin
RS D7
E D6
D4 D5
D5 D4
D6 D3
D7 D8
VSS GND
VDD 5V
VO Potentiometer Middle Pin
A (LED+) 5V
K (LED-) GND

🧠 Working Principle

  • The DHT22 measures temperature and humidity.
  • Arduino reads digital data from pin D2.
  • The values are processed.
  • Temperature is displayed on the first row of LCD.
  • Humidity is displayed on the second row.
  • The display updates every 2 seconds.

💻 Arduino Code

#include <LiquidCrystal.h>
#include <DHT.h>

#define DHTPIN 2
#define DHTTYPE DHT22

LiquidCrystal lcd(7, 6, 5, 4, 3, 8);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  lcd.begin(16, 2);
  dht.begin();
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  lcd.clear();

  if (isnan(temperature) || isnan(humidity)) {
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error");
    return;
  }

  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Hum: ");
  lcd.print(humidity);
  lcd.print(" %");

  delay(2000);
}

📌 Applications

  • Room environment monitoring

  • Smart home automation

  • Weather station projects

  • Industrial monitoring systems

  • IoT-based environmental tracking

🚀 Future Improvements

  • Add buzzer for high temperature alert

  • Display heat index

  • Use I2C LCD module

  • Send data to cloud via WiFi

  • Add data logging to SD card

👨‍💻 Author

Kritish