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.

Parameter	Technical data
Operation range	Pressure: 300… 1250 hPa
Supply voltage VDDIO Supply voltage VDD	1.2 V … 3.6 V 1.65 V … 3.6 V
Interface	I²C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz)
Average typical current consumption (1 Hz data rate)	3.4 µA @ 1 Hzpressure and temperature, 2.0 µA in sleep mode
Absolute accuracy P=300 …1100 hPa (T=0 … 65 °C)	± 50 Pa
Relative accuracy pressure (typ.) P=900…1100 hPa (T=25 … 40°C)	± 9 Pa, equiv. to ± 0.75 m
Noise in pressure (lowest bandwidth, highest resolution)	0.03 Pa
Temperature coefficient offset (25°…40°C @ 900 hPa)	±1 Pa/K
Long-term stability (12 months)	±0.70 hPa
Maximum sampling rate	200 Hz

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);

}

#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); }

#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