Temperature and Humidity Sensor Module with Arduino

This project uses an Arduino Uno and a DHT11 sensor to measure temperature and humidity, calculate the heat index, and display the data on t

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Temperature and Humidity Sensor Module with Arduino

Things used in this project

Hardware components

Arduino Uno

BreadBoard

Jumper Wire

1 DHT11 Humidity & Temperature Sensor Module

Usb Cable

Story

This project uses an Arduino Uno and a DHT11 sensor to measure temperature and humidity, calculate the heat index, and display the data on the serial monitor.

In this lesson, you’ll learn how to measure temperature and humidity, as well as calculate the heat index using a DHT11 sensor with an Arduino Uno. We’ll cover reading and interpreting data from the DHT11 sensor, and displaying these values along with the heat index in both Celsius and Fahrenheit on the serial monitor. This project is perfect for Arduino beginners, providing hands-on experience with sensors and data handling in a simple yet engaging way.

Step 1: Gather the Required Components

Before starting, make sure you have the following components:

Arduino Uno – The microcontroller board used for processing sensor data

DHT11Temperature & Humidity Sensor – The sensor that measures temperature andhumidity

Breadboard – Used for circuit prototyping

Jumper Wires (Male-to-Male) – For making connections

USB Cable – To connect the Arduino to the computer for programming and power

Step 2: Circuit Connections

Now, let’s wire the DHT11 sensor to the Arduino Uno as shown in the diagram below.

Step 3: Install the DHT11 Library in Arduino IDE

Before writing the code, we need to install the DHT11 library in Arduino IDE.

Steps to Install the Library:

Open Arduino IDE.

Go to Sketch → Include Library → Manage Libraries.

In the search bar, type “DHT sensor library”.

Install "DHT sensor library by Adafruit".

Step 4: Upload the Code

Code

DHT11 Humidity and Temperature Sensor Module

#include <DHT.h>  
#define DHTPIN 2      // Connect the Data pin of DHT11 to Digital Pin 2  
#define DHTTYPE DHT11 // Define the sensor type  
DHT dht(DHTPIN, DHTTYPE);  
void setup() {  
	 Serial.begin(9600);  
	 dht.begin();  
}  
void loop() {  
	 float humidity = dht.readHumidity();  
	 float temperatureC = dht.readTemperature(); // Read temperature in Celsius  
	 float temperatureF = temperatureC * 1.8 + 32; // Convert to Fahrenheit  
	 float heatIndexC = dht.computeHeatIndex(temperatureC, humidity, false); // Heat index in Celsius  
	 float heatIndexF = dht.computeHeatIndex(temperatureF, humidity); // Heat index in Fahrenheit  
	 Serial.print("Humidity: ");  
	 Serial.print(humidity);  
	 Serial.print(" %\t");  
	 Serial.print("Temperature: ");  
	 Serial.print(temperatureC);  
	 Serial.print(" °C / ");  
	 Serial.print(temperatureF);  
	 Serial.print(" °F\t");  
	 Serial.print("Heat Index: ");  
	 Serial.print(heatIndexC);  
	 Serial.print(" °C / ");  
	 Serial.print(heatIndexF);  
	 Serial.println(" °F");  
	 delay(2000); // Wait for 2 seconds before updating values  
}

Temperature and Humidity Sensor Module with Arduino