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

In this lesson, you will learn how to measure atmospheric pressure, temperature, and approximate altitude using the BMP280 sensor with an ESP32 Development Board. We will cover interfacing the sensor with the Adafruit BMP280 library and displaying readings on the Serial Monitor. This tutorial is ideal for those seeking to enhance their understanding of environmental sensing and data logging on the ESP32 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
ESP32 & Development Board (ESP32 Board)	BUY
Temperature, Humidity & Pressure Sensor (BMP280)	BUY
Breadboard	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.
   }