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 supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:
pip3 install adafruit-circuitpython-bme280
To install system-wide (this may be required in some cases):
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
Installing to a connected CircuitPython Device¶
Some devices, eg. the QT-PY, are very limited in memory. The BME280 library contains two variants - basic and advanced - which give different levels of functionality.
Installing the BME280 library could have the following outcomes:
It installs successfully and your code runs successfully. Woo-hoo! Continue with your amazing project.
It installs successfully and your code fails to run with a memory allocation error. Try one of the following:
- If your
code.pyis large, especially if it has lots of comments, you can shrink it into a
.mpyfile instead. See the Adafruit Learn Guide on shrinking your code.
- Only use the basic BME280 implementation, and remove the following file:
<CIRCUITPY>/lib/adafruit_bme280/advanced.mpywhere <CIRCUITPY> is the mounted location of your device. Make sure that your code only uses the basic implementation.
import board import time from adafruit_bme280 import basic as adafruit_bme280 # Create sensor object, using the board's default I2C bus. i2c = board.I2C() # uses board.SCL and board.SDA bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c) # 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.relative_humidity) print("Pressure: %0.1f hPa" % bme280.pressure) print("Altitude = %0.2f meters" % bme280.altitude) time.sleep(2)
Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.