DHT Arduino UNO

This project demonstrates a simple yet effective temperature and humidity monitoring system using an Arduino, a DHT11 sensor, and a Liquid Crystal Display (LCD). It allows real-time monitoring of environmental conditions, providing real-time readings of both temperature and humidity. This Arduino-based project is ideal for beginners looking to explore Arduino sensors, temperature sensing, humidity monitoring, and LCD display integration.

Key Features:

1. DHT11 Sensor Integration:

   • The DHT11 sensor accurately reads temperature (in degrees Celsius) and relative humidity levels, perfect for environmental monitoring projects.

2. LCD Display:

   • A 16x2 Liquid Crystal Display (LCD) visually presents the real-time temperature and humidity readings, offering a user-friendly interface for easy data visualization.

3. Temperature Threshold:

   • A predefined temperature threshold of 30°C allows you to set up custom alerts, useful for applications like temperature-sensitive environments or home automation systems.

4. Serial Monitoring:

   • The data is also sent to the Serial Monitor for debugging and additional functionality, enabling further development and integration with other Arduino projects.

Components Required:

• Arduino Board (e.g., Uno or Mega)
• DHT11 Temperature and Humidity Sensor
• 16x2 LCD with I2C or pin-based connection
• Jumper Wires
• Breadboard

How It Works:

1. The DHT11 sensor continuously measures the surrounding temperature and humidity levels.
2. These measurements are transmitted to the Arduino and displayed on the LCD screen in real-time, providing immediate feedback on environmental conditions.
3. The data is also logged to the Serial Monitor, allowing for easier debugging and performance analysis.

This Arduino project is a great starting point for anyone interested in learning about sensor integration, Arduino programming, and creating simple yet effective environmental monitoring systems. You can expand this project to integrate with IoT devices, smart home systems, and other automation technologies for a complete home automation solution.

Schematic:

Code:

#include <Wire.h>

#include <LiquidCrystal.h>

#include <DHT.h>

#define DHTTYPE DHT11  

#define DHTPIN  A0       // DHT11 sensor used

DHT dht11(DHTPIN, DHTTYPE);  // configure DHT library

LiquidCrystal lcd(12, 11, 5, 4, 3, 2, 10, 9, 8, 7);

const int THRESHOLD = 30; // Temperature threshold

void setup() {

  Wire.begin(); // Join I2C bus with address #8

  lcd.begin(16, 2); // Set up the LCD's number of columns and rows

  lcd.print("DHT11 Sensor");

  dht11.begin(); // Start the DHT11 sensor

void loop() {

  float t = dht11.readTemperature();

  float h = dht11.readHumidity();

if (t >= THRESHOLD) {

    lcd.clear();

    lcd.setCursor(0, 0);

    lcd.print("Temp:"); lcd.print(t);

    lcd.setCursor(0, 1);

    lcd.print("Humidity:"); lcd.print(h);

delay(2000); // Wait for 2 seconds before refreshing data