Overview

bmxx80 provides support for a popular sensor family from Bosch:

• BMP180 and BMP280, temperature and pressure
• BME280, temperature, pressure and relative humidity

BMP180 can be used over I²C. BME280 and BMP280 can use either I²C or SPI.

They all provide low precision temperature measurement.

Driver

The driver as the following functionality:

• Fast integer only calculation
• Support for both I²C and SPI (BMx280 only) connectivity

Tool

Use cmd/bmxx80 to retrieve measurement from the device.

Learn more

• BME280 at Adafruit

Example

Purpose: gather temperature, pressure and relative humidity (BME280 only).

This example uses either a BME280 or BMP280 connected via I²C.

package main

import (
    "fmt"
    "log"

    "periph.io/x/conn/v3/i2c/i2creg"
    "periph.io/x/conn/v3/physic"
    "periph.io/x/devices/v3/bmxx80"
    "periph.io/x/host/v3"
)

func main() {
    // Load all the drivers:
    if _, err := host.Init(); err != nil {
        log.Fatal(err)
    }

    // Open a handle to the first available I²C bus:
    bus, err := i2creg.Open("")
    if err != nil {
        log.Fatal(err)
    }
    defer bus.Close()

    // Open a handle to a bme280/bmp280 connected on the I²C bus using default
    // settings:
    dev, err := bmxx80.NewI2C(bus, 0x76, &bmxx80.DefaultOpts)
    if err != nil {
        log.Fatal(err)
    }
    defer dev.Halt()

    // Read temperature from the sensor:
    var env physic.Env
    if err = dev.Sense(&env); err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%8s %10s %9s\n", env.Temperature, env.Pressure, env.Humidity)
}

Smoke test

Setup for BME280/BMP280 smoke test:

• Two BME280 or BMP280 connected to a Raspberry Pi 3:
  • the top one is connected via I²C
  • the bottom one is connected via SPI:

It confirms that two BME280/BMP280 sensors can be driven simultaneously, one connected via I²C, one via SPI. They shall measure mostly the same atmospheric properties.

Buying

These links are for the BME280:

• Adafruit: adafruit.com/?q=bme280
• Aliexpress: aliexpress.com/wholesale?SearchText=bme280 (quality will vary among resellers)
• Amazon: amazon.com/s?field-keywords=bme280 (quality will vary among resellers)
• Pimoroni: shop.pimoroni.com/?q=bme280
• SeeedStudio: seeedstudio.com/s/bme280.html

The periph authors do not endorse any specific seller. These are only provided for your convenience.

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