GCI_BMP3XX

Why? Adafruit is awesome, but their driver is written for low power and not for performance. Hence you will not be able to get sampling rates up to 100Hz (or higher) with their driver because of the way it is coded. See the issue and the pull request for the background discussion.

This is a library for the Adafruit BMP388 precision pressure sensor breakout:

• https://www.adafruit.com/products/3966

Check out the links above for our tutorials and wiring diagrams. This chip uses I2C to communicate

Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!

Example

#include <Wire.h>
#include <GCI_BMP3XX.h>

constexpr float SEALEVELPRESSURE_HPA {1013.25};

GCI_BMP3XX bmp;

void setup() {
  Serial.begin(115200);
  while (!Serial);

  Wire.setClock(100000); // 100 kHz
  // Wire.setClock(400000); // 400 kHz

  if (!bmp.begin_I2C()) {   // hardware I2C mode, can pass in address & alt Wire
    Serial.println("Could not find a valid BMP3 sensor, check wiring!");
    while (1);
  }

  // Set up oversampling and filter initialization
  // Datasheet, table 9, pg 17
  if (1) {
        // Drone
        // Mode: Normal
        // OS Pres: x8
        // OS Temp: x1
        // IIR: 2 -> 3
        // Sampling: 50Hz
        // RMS Noise [cm]: 11
        bmp.setTemperatureOversampling(BMP3_NO_OVERSAMPLING);
        bmp.setPressureOversampling(BMP3_OVERSAMPLING_8X);
        bmp.setIIRFilterCoeff(BMP3_IIR_FILTER_COEFF_3);
        bmp.setOutputDataRate(BMP3_ODR_50_HZ);
    }
    else {
        // Indoor nav
        // Mode: Normal
        // OS Pres: x16
        // OS Temp: x2
        // IIR: 4 -> 15
        // Sampling: 25Hz
        // RMS Noise [cm]: 5
        bmp.setTemperatureOversampling(BMP3_OVERSAMPLING_2X);
        bmp.setPressureOversampling(BMP3_OVERSAMPLING_16X);
        bmp.setIIRFilterCoeff(BMP3_IIR_FILTER_COEFF_15);
        bmp.setOutputDataRate(BMP3_ODR_25_HZ);
    }
}

void loop() {
  if (! bmp.performReading()) {
    Serial.println("Failed to perform reading :(");
    return;
  }

  // Serial.println(bmp.temperature, 1);       // C
  Serial.println(bmp.pressure / 100.0, 3);  // hPa

  delay(10); // ~100Hz
}

Licenses

C Code

BSD-3-Clause, Copyright (c) 2020 Bosch Sensortec GmbH. All rights reserved.

C++ Code

Written by Limor Fried/Ladyada for Adafruit Industries. MIT license, all text above must be included in any redistribution

Modified to work at higher datarates by Kevin Walchko, MIT license, 2021