Using sensor libraries in Arduino - Mini Project: Build & Apply

Using sensor libraries

📖 Scenario: You have a temperature sensor connected to your Arduino. You want to read the temperature using a sensor library and display it on the Serial Monitor.

🎯 Goal: Learn how to include a sensor library, initialize the sensor, read temperature data, and print it to the Serial Monitor.

📋 What You'll Learn

Include the sensor library DHT.h

Create a DHT sensor object with pin 2 and type DHT11

Initialize the sensor in setup()

Read temperature in Celsius using sensor.readTemperature()

Print the temperature value to the Serial Monitor

💡 Why This Matters

🌍 Real World

Reading sensor data is common in home automation, weather stations, and robotics.

💼 Career

Understanding how to use sensor libraries is important for embedded systems and IoT developer roles.

1

Include the sensor library and create sensor object

Write #include <DHT.h> at the top. Then create a DHT object called sensor using pin 2 and type DHT11.

Arduino

# Your code here

Hint

Use #include <DHT.h> to add the library. Then create the sensor object with DHT sensor(2, DHT11);.

2

Initialize Serial and sensor in setup

Write void setup() function. Inside it, start Serial communication at 9600 baud with Serial.begin(9600);. Then initialize the sensor with sensor.begin();.

Arduino

#include 

DHT sensor(2, DHT11);

// Your code here

Hint

Use void setup() { Serial.begin(9600); sensor.begin(); } to prepare the sensor and Serial Monitor.

3

Read temperature in loop

Write void loop() function. Inside it, read temperature in Celsius using float temp = sensor.readTemperature();. Then add a delay of 2000 milliseconds with delay(2000);.

Arduino

#include 

DHT sensor(2, DHT11);

void setup() {
  Serial.begin(9600);
  sensor.begin();
}

// Your code here

Hint

Use float temp = sensor.readTemperature(); to get temperature and delay(2000); to wait 2 seconds.

4

Print temperature to Serial Monitor

Inside loop(), after reading temperature, print it using Serial.print("Temperature: "); and Serial.println(temp);.

Arduino

#include 

DHT sensor(2, DHT11);

void setup() {
  Serial.begin(9600);
  sensor.begin();
}

void loop() {
  float temp = sensor.readTemperature();
  // Your code here
  delay(2000);
}

Hint

Use Serial.print("Temperature: "); and Serial.println(temp); to show the temperature value.