Environment - BMP3xx

BMP3xx Temperature and Pressure sensors

Plugin details

Type: Environment

Name: BMP3xx

Status: COLLECTION G CLIMATE

GitHub: P154_BMP3xx.ino

Maintainer: TD-er

Used libraries: Adafruit BMP3XX Library

Description

As a successor to their BMP280, Bosch made the BMP388 and the even higher resolution BMP390 temperature and air pressure sensors.

The main improvements compared to the BMP280 are:

  • Lower power consumption

  • Higher possible sample rate

  • Option to store a number of samples in the 512 byte buffer to burst read

  • Higher resolution

  • Less noise

Configuration

../_images/P154_DeviceConfiguration.png

  • Name: Required by ESPEasy, must be unique among the list of available devices/tasks.

  • Enabled: The device can be disabled or enabled. When not enabled the device should not use any resources.

I2C options

  • I2C Address: The sensor supports a single address, but that address depends on the actual type suffix, printed on the sensor chip (and usually included in the documentation for the device/board).

Address

Remark

0x76

Connect SDO to GND

0x77

Connect SDO to V_DDIO (default on most boards)

The available I2C settings here depend on the build used. At least the Force Slow I2C speed option is available, but selections for the I2C Multiplexer can also be shown. For details see the Hardware page

Since this chip supports both SPI and I2C, the pin naming may be slightly confusing:

  • SCK: Serial Clock (SCL)

  • SDI: Data (SDA)

  • SDO: Slave Address LSB (GND = ‘0’, V_DDIO = ‘1’)

  • CSB is not used and left open.

  • SDI must be externally connected to V_DDIO via pull-up resistor.

On most boards sold online, SDO and SDI are already pulled-up, setting the default I2C address to 0x77.

Device Settings

  • Detected Sensor Type: Shows either BMP38x or BMP390 or a number if no sensor or an unknown sensor ID is detected.

  • Altitude: Optionally set the offset (in meters) of the sensor to convert pressure measurements to sea level pressure.

Data Acquisition

This group of settings, Single event with all values and Send to Controller settings are standard available configuration items. Send to Controller is only visible when one or more Controllers are configured.

  • Interval By default, Interval will be set to 60 sec. The data will be collected and optionally sent to any configured controllers using this interval. If the Interval is set lower or equal than the required 10 * Heater time, the plugin will not start!

Values

The plugin provides the Temperature and Pressure values. A formula can be set to recalculate. The number of decimals can be set as desired, and defaults to 2.

In selected builds, per Value is a Stats checkbox available, that when checked, gathers the data and presents recent data in a graph, as described here: Task Value Statistics:

Currently the extra features offered by the sensore are not configurable in this plugin. These may be added later.

The internal filtering in the sensor is fixed to these settings:

  • Temperature: 8x oversampling

  • Pressure: 4x oversampling

  • IIR Filter Coefficient: 3

  • Sample rate: 50 Hz

Example of the high temperature resolution of a BMP388

Example of the high temperature resolution of a BMP388

Change log

Changed in version 2.0: …

added 2023-09-07 Initial release version.