A simple and efficient Arduino library for the Bosch BMP390 barometric pressure and temperature sensor. This library provides an easy-to-use interface for reading compensated temperature and pressure data from the BMP390 sensor via I2C.

• Easy Initialization: Simple setup for the BMP390 sensor.
• Temperature and Pressure Readings: Accurately reads compensated temperature and pressure values.
• Internal Calibration: Handles sensor calibration data and compensation calculations automatically.
• Standard I2C Communication: Utilizes the Arduino Wire library for robust I2C communication.
• Broad Compatibility: Works with Arduino UNO, ESP32, and other Arduino-compatible boards.

Using Arduino IDE Library Manager (This method will be available once the library is officially added to the registry)

Open the Arduino IDE.

Go to Sketch > Include Library > Manage Libraries....

In the Library Manager, search for "BMP390".

Select the "BMP390 by Mohammed Faisal I"and click "Install".

Download the latest release ZIP file from the GitHub repository.

In the Arduino IDE, go to Sketch > Include Library > Add .ZIP Library....

Navigate to and select the downloaded ZIP file.

Restart the Arduino IDE.

Alternatively, you can manually:

Download the latest release ZIP file.

Unzip the file.

Rename the unzipped folder to BMP390.

Move the BMP390 folder into your Arduino libraries directory (e.g., Documents/Arduino/libraries/).

Restart the Arduino IDE.

Usage Connect your BMP390 sensor to your Arduino/ESP32 board's I2C pins.

BMP390 SDA to SDA

BMP390 SCL to SCL

BMP390 VCC to 3.3V (or 5V if your sensor module has a voltage regulator)

BMP390 GND to GND

For ESP32: You can specify the SDA and SCL pins in the constructor. For Arduino Uno/Mega: The SDA/SCL pins are typically fixed (e.g., A4/A5 for Uno, 20/21 for Mega) and don't need to be explicitly passed in the constructor. You can use BMP390 bmp; if you're using the default I2C pins.

Here's a basic example sketch to get you started

#include <Wire.h>
#include <BMP390.h>

// Define I2C pins for ESP32. Adjust these to your specific wiring. // For Arduino Uno/Mega, you can often omit these and use BMP390 bmp; const int I2C_SDA_PIN = 21; // Example SDA pin for ESP32
const int I2C_SCL_PIN = 22; // Example SCL pin for ESP32

BMP390 bmp(I2C_SDA_PIN, I2C_SCL_PIN); 

void setup() {
  Serial.begin(115200);
  // Wait for serial port to connect. Needed for boards with native USB (e.g., ESP32, Leonardo)
  while (!Serial && millis() < 5000); 

  Serial.println("Initializing BMP390 sensor...");
  bmp3_data bmp_data = bmp.get_bmp_values();
  if (bmp_data.success) {
    Serial.println("BMP390 Initialized Successfully!");
  } else {
    Serial.println("BMP390 Initialization Failed! Please check wiring and sensor connection.");
  }
}

void loop() {
  bmp3_data data = bmp.get_bmp_values();

  if (data.success) {
    Serial.print("Temperature: ");
    Serial.print(data.temperature, 2); // Print with 2 decimal places
    Serial.println(" °C");

    Serial.print("Pressure: ");
    Serial.print(data.pressure / 100.0, 2); // Convert Pascals to hPa (hectopascals)
    Serial.println(" hPa");
  } else {
    Serial.println("Failed to read BMP390 data.");
  }

  delay(1000); // Read every 1 second
}

Constructor for the BMP390 class.

• sda_pin: (int) The SDA pin for I2C communication. This is required for ESP32 and other boards where I2C pins are configurable.

• scl_pin: (int) The SCL pin for I2C communication. Required for configurable I2C pins.

Note: For boards with fixed I2C pins (like Arduino Uno/Mega), you can use the default constructor BMP390 bmp;

• bool init_bmp390() Initializes the BMP390 sensor. This function should be called once in your setup() function.

Returns: true on successful initialization, false otherwise.

• bmp3_data get_bmp_values() Reads raw temperature and pressure data from the sensor, applies Bosch's compensation algorithm, and returns the results.

Returns: A bmp3_data struct containing:

double temperature: Compensated temperature in degrees Celsius.

double pressure: Compensated pressure in Pascals.

bool success: true if the reading was successful, false if there was an error (e.g., sensor not found, zero raw data).

This project is licensed under the MIT License - see the LICENSE.txt file for details.