BMP280/BME280 sensor library for Arduino

This is a BMP280/BME280 temperature/pressure/humidity sensor library for Arduino.

Arduino library features

Measurements:
- BMP280: Temperature / pressure / approximate altitude
- BME280: Temperature / pressure / approximate altitude / humidity
Three operation modes:
- Normal mode: Continues conversion
- Forced mode: One-time conversion
- Standby mode: Low-power, no conversion
Sampling configuration
Chip detect / read chip ID
I2C interface only
Small flash/RAM footprint

BMP280/BME280 sensor specifications

Operating voltage: 1.71V .. 3.6V max
Low current:
- 1.8 uA @ 1 Hz humidity and temperature
- 2.8 uA @ 1 Hz pressure and temperature
- 3.6 uA @ 1 Hz humidity, pressure and temperature
- 0.1 uA in sleep mode
Operating range: -40...+85 °C, 0...100 % rel. humidity, 300...1100 hPa
I2C bus interface: max 3.4 MHz
No additional electronic components needed

Hardware

Connection Arduino board - BMX280 sensor

Pins board - BMX280	VCC	GND	SDA	SCL
Arduino UNO (ATMega328 boards)	5V	GND	A4	A5
Arduino Mega2560	5V	GND	D20	D21
Arduino Leonardo	5V	GND	D2	D3
Arduino DUE (ATSAM3X8E)	3V3	GND	20	21
ESP8266	3V3	GND	GPIO4 (D2)	GPIO5 (D1)
ESP32	3V3	GND	GPIO21	GPIO22

Other unlisted MCU's may work, but are not tested.

Examples

Examples | Erriez BMP280/BME280 sensor:

ErriezBMX280

Documentation

Example

#include <Wire.h>
#include <ErriezBMX280.h>

// Adjust sea level for altitude calculation
#define SEA_LEVEL_PRESSURE_HPA      1026.25

// Create BMX280 object I2C address 0x76 or 0x77
ErriezBMX280 bmx280 = ErriezBMX280(0x76);


void setup()
{
    // Initialize serial
    delay(500);
    Serial.begin(115200);
    while (!Serial) {
        ;
    }
    Serial.println(F("\nErriez BMP280/BMX280 example"));

    // Initialize I2C bus
    Wire.begin();
    Wire.setClock(400000);

    // Initialize sensor
    while (!bmx280.begin()) {
        Serial.println(F("Error: Could not detect sensor"));
        delay(3000);
    }

    // Print sensor type
    Serial.print(F("\nSensor type: "));
    switch (bmx280.getChipID()) {
        case CHIP_ID_BMP280:
            Serial.println(F("BMP280\n"));
            break;
        case CHIP_ID_BME280:
            Serial.println(F("BME280\n"));
            break;
        default:
            Serial.println(F("Unknown\n"));
            break;
    }
}

void loop()
{
    Serial.print(F("Temperature: "));
    Serial.print(bmx280.readTemperature());
    Serial.println(" C");

    if (bmx280.getChipID() == CHIP_ID_BME280) {
        Serial.print(F("Humidity:    "));
        Serial.print(bmx280.readHumidity());
        Serial.println(" %");
    }

    Serial.print(F("Pressure:    "));
    Serial.print(bmx280.readPressure() / 100.0F);
    Serial.println(" hPa");

    Serial.print(F("Altitude:    "));
    Serial.print(bmx280.readAltitude(SEA_LEVEL_PRESSURE_HPA));
    Serial.println(" m");

    Serial.println();

    delay(1000);
}

Output

Erriez BMP280/BMX280 example

Sensor type: BME280

Temperature: 28.50 C
Humidity:    45.13 %
Pressure:    1024.88 hPa
Altitude:    11.27 m

Temperature: 28.55 C
Humidity:    45.21 %
Pressure:    1024.89 hPa
Altitude:    11.21 m

...

Set sampling

The sensor sampling and mode can be configured with function setSampling(). Recommended modes of operation according to the datasheet chapter "Recommended modes of operation":

// Set sampling
//
// Weather
//  - forced mode, 1 sample / minute
//  - pressure ×1, temperature ×1, humidity ×1
//  - filter off
//
// Humidity sensing
//  - forced mode, 1 sample / second
//  - pressure ×0, temperature ×1, humidity ×1
//  - filter off
//
// Indoor navigation
//  - normal mode, t standby = 0.5 ms
//  - pressure ×16, temperature ×2, humidity ×1
//  - filter coefficient 16
//
// Gaming
//  - forced mode, t standby = 0.5 ms
//  - pressure ×1, temperature ×1, humidity ×1
//  - filter off
bmx280.setSampling(BMX280_MODE_NORMAL,    // SLEEP, FORCED, NORMAL
                   BMX280_SAMPLING_X16,   // Temp:  NONE, X1, X2, X4, X8, X16
                   BMX280_SAMPLING_X16,   // Press: NONE, X1, X2, X4, X8, X16
                   BMX280_SAMPLING_X16,   // Hum:   NONE, X1, X2, X4, X8, X16 (BME280)
                   BMX280_FILTER_X16,     // OFF, X2, X4, X8, X16
                   BMX280_STANDBY_MS_500);// 0_5, 10, 20, 62_5, 125, 250, 500, 1000

Library dependencies

Built-in Wire.h

Library installation

Please refer to the Wiki page.

Other Arduino Libraries and Sketches from Erriez

Erriez Libraries and Sketches

mhightower83/ErriezBMX280