# Python I2C Driver for Sensirion STC42
This repository contains the Python driver to communicate with a Sensirion STC42A sensor over I2C.
<img src="https://raw.githubusercontent.com/Sensirion/python-i2c-stc42/master/images/product-image.png"
width="300px" alt="STC42 picture">
Click [here](https://sensirion.com/products/catalog/STC42A) to learn more about the Sensirion STC42A sensor.
The STC42A is a sensor for measuring hydrogen in air.
The default I²C address of [STC42A](https://sensirion.com/products/catalog/STC42A) is **0x29**.
Additionally supported I²C addresses are 0x2A, 0x2B.
## Connect the sensor
You can connect your sensor over a [SEK-SensorBridge](https://developer.sensirion.com/product-support/sek-sensorbridge/).
For special setups you find the sensor pinout in the section below.
<details><summary>Sensor pinout</summary>
<p>
<img src="https://raw.githubusercontent.com/Sensirion/python-i2c-stc42/master/images/product-pinout.jpg"
width="300px" alt="sensor wiring picture">
| *Pin* | *Cable Color* | *Name* | *Description* | *Comments* |
|-------|---------------|:------:|----------------|------------|
| 1 | black | GND | Ground |
| 2 | red | VDD | Supply Voltage | 3.15V to 3.45V
| 3 | blue | SDA | I2C: Serial data input / output |
| 4 | yellow | SCL | I2C: Serial clock input |
</p>
</details>
## Documentation & Quickstart
See the [documentation page](https://sensirion.github.io/python-i2c-stc42) for an API description and a
[quickstart](https://sensirion.github.io/python-i2c-stc42/execute-measurements.html) example.
## Contributing
### Check coding style
The coding style can be checked with [`flake8`](http://flake8.pycqa.org/):
```bash
pip install -e .[test] # Install requirements
flake8 # Run style check
```
In addition, we check the formatting of files with
[`editorconfig-checker`](https://editorconfig-checker.github.io/):
```bash
pip install editorconfig-checker==2.0.3 # Install requirements
editorconfig-checker # Run check
```
## License
See [LICENSE](LICENSE).
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