Introduction¶

I2C and SPI driver for the Bosch BME280 Temperature, Humidity, and Barometric Pressure sensor

Installation and Dependencies¶

This driver depends on:

Please ensure that the driver and all dependencies are available on the CircuitPython filesystem. This can be most easily achieved by downloading and installing the latest Adafruit library and driver bundle on your device.

Installing from PyPI¶

On the Raspberry Pi, you can install the driver locally from PyPI. To install system-wide, use:

sudo pip3 install adafruit-circuitpython-bme280

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .env
source .env/bin/activate
pip3 install adafruit-circuitpython-bme280

Usage Example¶

import board
import digitalio
import busio
import time
import adafruit_bme280

# Create library object using our Bus I2C port
i2c = busio.I2C(board.SCL, board.SDA)
bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)

# OR create library object using our Bus SPI port
#spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
#bme_cs = digitalio.DigitalInOut(board.D10)
#bme280 = adafruit_bme280.Adafruit_BME280_SPI(spi, bme_cs)

# change this to match the location's pressure (hPa) at sea level
bme280.sea_level_pressure = 1013.25

while True:
    print("\nTemperature: %0.1f C" % bme280.temperature)
    print("Humidity: %0.1f %%" % bme280.humidity)
    print("Pressure: %0.1f hPa" % bme280.pressure)
    print("Altitude = %0.2f meters" % bme280.altitude)
    time.sleep(2)

Contributing¶

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Building Locally¶

To build this library locally you’ll need to install the circuitpython-build-tools package.

python3 -m venv .env
source .env/bin/activate
pip3 install circuitpython-build-tools

Once installed, make sure you are in the virtual environment:

source .env/bin/activate

Then run the build:

circuitpython-build-bundles --filename_prefix adafruit-circuitpython-veml6070 --library_location .

Sphinx Documentation¶

Sphinx is used to build the documentation based on rST files and comments in the code. First, install dependencies (feel free to reuse the virtual environment from above):

python3 -m venv .env
source .env/bin/activate
pip3 install Sphinx sphinx-rtd-theme

Now, once you have the virtual environment activated:

cd docs
sphinx-build -E -W -b html . _build/html

This will output the documentation to docs/_build/html. Open the index.html in your browser to view them. It will also (due to -W) error out on any warning like Travis will. This is a good way to locally verify it will pass.

Table of Contents¶

Simple test¶

Ensure your device works with this simple test.

examples/bme280_simpletest.py¶

import time

import board
import busio
import adafruit_bme280

# Create library object using our Bus I2C port
i2c = busio.I2C(board.SCL, board.SDA)
bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)

# OR create library object using our Bus SPI port
#spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
#bme_cs = digitalio.DigitalInOut(board.D10)
#bme280 = adafruit_bme280.Adafruit_BME280_SPI(spi, bme_cs)

# change this to match the location's pressure (hPa) at sea level
bme280.sea_level_pressure = 1013.25

while True:
    print("\nTemperature: %0.1f C" % bme280.temperature)
    print("Humidity: %0.1f %%" % bme280.humidity)
    print("Pressure: %0.1f hPa" % bme280.pressure)
    print("Altitude = %0.2f meters" % bme280.altitude)
    time.sleep(2)

`adafruit_bme280` - Adafruit BME680 - Temperature, Humidity, Pressure & Gas Sensor¶

CircuitPython driver from BME280 Temperature, Humidity and Barometic Pressure sensor

Author(s): ladyada

class adafruit_bme280.Adafruit_BME280[source]¶

Driver from BME280 Temperature, Humidity and Barometic Pressure sensor

altitude¶: The altitude based on current pressure versus the sea level pressure (sea_level_pressure) - which you must enter ahead of time)

humidity¶: The relative humidity in RH %

pressure¶: The compensated pressure in hectoPascals.

sea_level_pressure = None¶: Pressure in hectoPascals at sea level. Used to calibrate altitude.

temperature¶: The compensated temperature in degrees celsius.

class adafruit_bme280.Adafruit_BME280_I2C(i2c, address=<sphinx.ext.autodoc.importer._MockObject object>)[source]¶: Driver for BME280 connected over I2C

class adafruit_bme280.Adafruit_BME280_SPI(spi, cs, baudrate=100000)[source]¶: Driver for BME280 connected over SPI