Python Driver for Sensirion I²C Carbon Dioxide Sensor

This repository contains the Python driver to communicate with Sensirion SCD4x CO2 sensors using the I²C interface.

Click here to learn more about the SCD4x sensor and the SCD41 Evaluation Kit Board.

Click here to learn more about the Sensirion SCD4x sensor family.

Supported Sensors

• SCD40
• SCD41
• SCD42

Usage

See user manual at https://sensirion.github.io/python-i2c-scd/.

Connecting the SCD41 Evaluation Kit Board

Your sensor has the four different connectors: VCC, GND, SDA and SCL. The provided jumper wire cables have the following colors.

SCD4x	Jumper Wire
VCC	Red
GND	Black
SDA	Green
SCL	Yellow

Development

We develop and test this driver using our company internal tools (version control, continuous integration, code review etc.) and automatically synchronize the master branch with GitHub. But this doesn't mean that we don't respond to issues or don't accept pull requests on GitHub. In fact, you're very welcome to open issues or create pull requests :)

Check coding style

The coding style can be checked with flake8:

pip install -e .[test]  # Install requirements
flake8                  # Run style check

In addition, we check the formatting of files with editorconfig-checker:

pip install editorconfig-checker==2.0.3   # Install requirements
editorconfig-checker                      # Run check

Run tests

Unit tests can be run with pytest:

pip install -e .[test]                             # Install requirements
pytest -m "not needs_device"                       # Run tests without hardware
pytest                                             # Run all tests
pytest -m "not (needs_device and not needs_scd4x)" # Run all tests for scd4x

The tests with the marker needs_scd4x have following requirements:

• An SCD4x device must be connected to a SensorBridge on port 1.
• Pass the serial port where the SensorBridge is connected with --serial-port, e.g. pytest --serial-port=COM7
• The SensorBridge must have default settings (baudrate 460800, address 0)

Build documentation

The documentation can be built with Sphinx:

python setup.py install                        # Install package
pip install -r docs/requirements.txt           # Install requirements
sphinx-versioning build docs docs/_build/html  # Build documentation

License

See LICENSE.