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

Name	Link
Raspberry Pi Pico		Aliexpress link Amazon Ebay
BMP384		Aliexpress link Ebay link
Connecting cables		Aliexpress link Amazon Ebay

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