Introduction

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CircuitPython module for the SHT31-D temperature and humidity sensor.

Dependencies

This driver depends on:

• Adafruit CircuitPython <https://github.com/adafruit/circuitpython>_
• Bus Device <https://github.com/adafruit/Adafruit_CircuitPython_BusDevice>_

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle <https://github.com/adafruit/Adafruit_CircuitPython_Bundle>_.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI <https://pypi.org/project/adafruit-circuitpython-sht31d/>_. To install for current user:

.. code-block:: shell

pip3 install adafruit-circuitpython-sht31d

To install system-wide (this may be required in some cases):

.. code-block:: shell

sudo pip3 install adafruit-circuitpython-sht31d

To install in a virtual environment in your current project:

.. code-block:: shell

mkdir project-name && cd project-name
python3 -m venv .env
source .env/bin/activate
pip3 install adafruit-circuitpython-sht31d

Usage Example

You must import the library to use it:

.. code:: python

import adafruit_sht31d

This driver takes an instantiated and active I2C object (from the busio or the bitbangio library) as an argument to its constructor. The way to create an I2C object depends on the board you are using.

.. code:: python

import board

i2c = board.I2C()

Once you have created the I2C interface object, you can use it to instantiate the sensor object:

.. code:: python

sensor = adafruit_sht31d.SHT31D(i2c)

And then you can start measuring the temperature and humidity:

.. code:: python

print(sensor.temperature)
print(sensor.relative_humidity)

You can instruct the sensor to periodically measure the temperature and humidity, storing the result in its internal cache:

.. code:: python

sensor.mode = adafruit_sht31d.MODE_PERIODIC

You can adjust the frequency at which the sensor periodically gathers data to: 0.5, 1, 2, 4 or 10 Hz. The following adjusts the frequency to 2 Hz:

.. code:: python

sensor.frequency = adafruit_sht31d.FREQUENCY_2

The sensor is capable of storing eight results. The sensor stores these results in an internal FILO cache. Retrieving these results is simlilar to taking a measurement. The sensor clears its cache once the stored data is read. The sensor always returns eight data points. The list of results is backfilled with the maximum output values of 130.0 ºC and 100.01831417975366 % RH:

.. code:: python

print(sensor.temperature)
print(sensor.relative_humidity)

The sensor will continue to collect data at the set interval until it is returned to single shot data acquisition mode:

.. code:: python

sensor.mode = adafruit_sht31d.MODE_SINGLE

Documentation

API documentation for this library can be found on Read the Docs <https://docs.circuitpython.org/projects/sht31d/en/latest/>_.

For information on building library documentation, please check out this guide <https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/sharing-our-docs-on-readthedocs#sphinx-5-1>_.

Contributing

Contributions are welcome! Please read our Code of Conduct <https://github.com/adafruit/Adafruit_CircuitPython_SHT31D/blob/main/CODE_OF_CONDUCT.md>_ before contributing to help this project stay welcoming.