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Lesson 20: Temperature, Humidity & Pressure Sensor (BMP280)

In this lesson, you will learn how to use the BMP280 sensor with an Arduino Uno to read atmospheric pressure, temperature, and approximate altitude. We’ll cover integrating the sensor with Arduino using the Adafruit BMP280 library and displaying readings on the Serial Monitor. This session is ideal for beginners in electronics and programming who want to understand sensor interfacing and data acquisition on the Arduino platform.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Arduino UNO R3 or R4	BUY
Temperature, Humidity & Pressure Sensor (BMP280)	BUY

Wiring

Code

Note

To install the library, use the Arduino Library Manager and search for “Adafruit BMP280” and install it.

Code Analysis

1. Including Libraries and Initialization. Necessary libraries are included and the BMP280 sensor is initialized for communication using the I2C interface.

   Note

   To install the library, use the Arduino Library Manager and search for “Adafruit BMP280” and install it.

   • Adafruit BMP280 Library: This library provides an easy-to-use interface for the BMP280 sensor, allowing the user to read temperature, pressure, and altitude.

   • Wire.h: Used for I2C communication.

   
   

   #include <Wire.h>
   #include <Adafruit_BMP280.h>
   #define BMP280_ADDRESS 0x76
   Adafruit_BMP280 bmp;  // use I2C interface
   

2. The setup() function initializes the Serial communication, checks for the BMP280 sensor, and sets up the sensor with default settings.

   void setup() {
     Serial.begin(9600);
     while (!Serial) delay(100);
     Serial.println(F("BMP280 test"));
     unsigned status;
     status = bmp.begin(BMP280_ADDRESS);
     // ... (rest of the setup code)
   

3. The loop() function reads data from the BMP280 sensor for temperature, pressure, and altitude. This data is printed to the Serial Monitor.

   void loop() {
     // ... (read and print temperature, pressure, and altitude data)
     delay(2000);  // 2-second delay between readings.
   }