BMP384 and Raspberry Pi Pico Arduino example

In this article we connect the ever popular BMP384 Sensor to a raspberry Pi Pico and we will then display readings via the serial monitor window. We are using t he Arduino IDE.

Lets look at the sensor first

Features

The BMP384 provides excellent accuracy across a wide measurement range (300hPa to 1250hPa and -40 to +85°C).

The sensor also features a configurable oversampling setting, a FIFO buffer for storing up to 73 measurements, as well as a low pass filter so users can customize the performance based on the application’s requirements.

The sensor communicates over I²C by default.

The BMP384 has three operating modes: Sleep Mode, Normal Mode and Forced Mode. While in Sleep Mode the sensor is idle and consumes ~2µA. While in Normal Mode, the sensor automatically cycles between measurement and standby periods and consumes ~700µA at peak current draw during measurements.

Forced Mode allows direct control of measurements to wake the sensor from Sleep Mode, take a single-shot measurement, and return the device to Sleep Mode.

Parts Required

Schematic/Connection

Here is a layout in fritzing to show this

Code Example

I used the sparkfun BMP384 library and  this is the default example which worked

#include <Wire.h>
#include "SparkFunBMP384.h"

// Create a new sensor object
BMP384 pressureSensor;

// I2C address selection
uint8_t i2cAddress = BMP384_I2C_ADDRESS_DEFAULT; // 0x77
//uint8_t i2cAddress = BMP384_I2C_ADDRESS_SECONDARY; // 0x76

void setup()
{
    // Start serial
    Serial.begin(115200);
    Serial.println("BMP384 Example1 begin!");

    // Initialize the I2C library
    Wire.begin();

    // Check if sensor is connected and initialize
    // Address is optional (defaults to 0x77)
    while(pressureSensor.beginI2C(i2cAddress) != BMP3_OK)
    {
        // Not connected, inform user
        Serial.println("Error: BMP384 not connected, check wiring and I2C address!");

        // Wait a bit to see if connection is established
        delay(1000);
    }

    Serial.println("BMP384 connected!");
}

void loop()
{
    // Get measurements from the sensor
    bmp3_data data;
    int8_t err = pressureSensor.getSensorData(&data);

    // Check whether data was acquired successfully
    if(err == BMP3_OK)
    {
        // Acquisistion succeeded, print temperature and pressure
        Serial.print("Temperature (C): ");
        Serial.print(data.temperature);
        Serial.print("\t\t");
        Serial.print("Pressure (Pa): ");
        Serial.println(data.pressure);
    }
    else
    {
        // Acquisition failed, most likely a communication error (code -2)
        Serial.print("Error getting data from sensor! Error code: ");
        Serial.println(err);
    }

    // Only print every second
    delay(1000);
}

Output

Temperature (C): 18.95 Pressure (Pa): 98937.87
Temperature (C): 18.96 Pressure (Pa): 98915.58
Temperature (C): 18.95 Pressure (Pa): 98953.07
Temperature (C): 18.95 Pressure (Pa): 98913.54
Temperature (C): 18.95 Pressure (Pa): 98929.76

Links

https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp384-ds003.pdf

https://github.com/sparkfun/SparkFun_BMP384_Arduino_Library