BMP388 Pressure & Temperature Sensor - Continuous measurement

This page contains a simple example showing how to take continuous measurements with the BMP388 and printing it to the REPL.

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Connections for this example

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Initialization

To use the BMP388 sensor, first include the required module, create the sensor object, and initialize the sensor in the setup() function, along with setting its calibration parameters

from machine import Pin, I2C
from bmp388 import BMP388
from bmp388_constants import TIME_STANDBY_1280MS
import time

# If you aren't using the Qwiic connector, manually enter your I2C pins
# i2c = I2C(0, scl=Pin(22), sda=Pin(21))
# bmp388 = BMP388(i2c)

# Initialize sensor over Qwiic
bmp388 = BMP388()

# Set sea level pressure for accurate altitude readings
bmp388.setSeaLevelPressure(1025.0)

# Set standby time to roughly 1.3 seconds
bmp388.setTimeStandby(TIME_STANDBY_1280MS)

# Start continuous measurement in normal mode
bmp388.startNormalConversion()

bmp388.BMP388()

Initializes the BMP388 sensor, setting up communication over I2C

Returns value: 1 if initialization was successfull, 0 if not

bmp388.setSeaLevelPressure(float pressure)

Sets the sea level value of pressure, used in calculating altitude

Returns value: None

Function parameters:

Type	Name	Description
float	pressure	Pressure value in hPa

bmp388.setTimeStandby(enum TimeStandby standby)

Set the standby time of each sample

Returns value: None

Function parameters:

Type	Name	Description
enum TimeStandby	standby	Time the sensor will be asleep between each measurement

bmp388.startNormalConversion()

Start BMP388 continuous conversion in normal mode.

Returns value: None

Getting all readings

In an infinite loop, we get measurements from the sensor and print them out to the REPL:

while True:
    temperature, pressure, altitude = bmp388.getMeasurements()
    if temperature is not None:
        print("{:.2f}*C   {:.2f}hPa   {:.2f}m".format(temperature, pressure, altitude))
    time.sleep(0.25)

bmp388.getMeasurements();

Gets measurements from the sensor if the sensor is ready to do so

Returns value: Returns a tuple of the temperature (in degrees celsius), pressure (in hPa) and altitude (in meters)

REPL output

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Full Example

You can find the full example below:

// Include Soldered BMP388 library.
#include <BMP388-SOLDERED.h>

// Create BMP388 sensor object.
Soldered_BMP388 bmp388;

void setup()
{
    // Initialize serial communication at 115200 bauds.
    Serial.begin(115200);

    // Initialize sensor (check for sensor). Notify if init failed.
    // Also, this will set BMP388 sensor into sleep mode.
    if (!bmp388.begin())
    {
        // Print error message.
        Serial.println("Sensor not found! Check your wiring!");

        // Stop the code!
        while (1)
        {
            // Delay for ESP8266.
            delay(10);
        }
    }

    // Set current pressure at sea level to get accurate altitude readings.
    bmp388.setSeaLevelPressure(1025.0);

    // Set the standby time of each sample to be roughly 1.3 seconds.
    bmp388.setTimeStandby(TIME_STANDBY_1280MS);

    // Start BMP388 continuous conversion in normal mode.
    bmp388.startNormalConversion();
}

void loop()
{
    // Variables for storing measurement data.
    float temperature, pressure, altitude;

    // Check if the data is ready.
    if (bmp388.getMeasurements(temperature, pressure, altitude))
    {
        // Print the results.
        Serial.print(temperature);
        Serial.print(F("*C   "));
        Serial.print(pressure);
        Serial.print(F("hPa   "));
        Serial.print(altitude);
        Serial.println(F("m"));
    }
}