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Metadata-Version: 2.4
Name: adafruit-circuitpython-dht
Version: 4.0.8
Summary: CircuitPython support for DHT11 and DHT22 type temperature/humidity devices
Author-email: Adafruit Industries <circuitpython@adafruit.com>
License: MIT
Project-URL: Homepage, https://github.com/adafruit/Adafruit_CircuitPython_DHT
Keywords: adafruit,dht,hardware,sensors,temperature,humidity,micropython,circuitpython
Classifier: Intended Audience :: Developers
Classifier: Topic :: Software Development :: Libraries
Classifier: Topic :: Software Development :: Embedded Systems
Classifier: Topic :: System :: Hardware
Classifier: License :: OSI Approved :: MIT License
Classifier: Programming Language :: Python :: 3
Description-Content-Type: text/x-rst
License-File: LICENSE
Requires-Dist: Adafruit-Blinka
Provides-Extra: optional
Dynamic: license-file
Introduction
============
.. image:: https://readthedocs.org/projects/adafruit-circuitpython-dht/badge/?version=latest
:target: https://docs.circuitpython.org/projects/dht/en/latest/
:alt: Documentation Status
.. image:: https://raw.githubusercontent.com/adafruit/Adafruit_CircuitPython_Bundle/main/badges/adafruit_discord.svg
:target: https://adafru.it/discord
:alt: Discord
.. image:: https://github.com/adafruit/Adafruit_CircuitPython_DHT/workflows/Build%20CI/badge.svg
:target: https://github.com/adafruit/Adafruit_CircuitPython_DHT/actions
:alt: Build Status
.. image:: https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json
:target: https://github.com/astral-sh/ruff
:alt: Code Style: Ruff
CircuitPython support for the DHT11 and DHT22 temperature and humidity devices.
Dependencies
=============
This driver depends on:
* `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_
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>`_.
.. note::
This library uses the `pulseio` module in CircuitPython. As of CircuitPython 7.0.0, `pulseio` is
no longer available on the smallest CircuitPython builds,
such as the Trinket M0, Gemma M0, and Feather M0 Basic boards.
You can substitute a more modern sensor, which will work better as well.
See the guide `Modern Replacements for DHT11 and DHT22 Sensors
<https://learn.adafruit.com/modern-replacements-for-dht11-dht22-sensors>`_
for suggestions.
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-dht/>`_. To install for current user:
.. code-block:: shell
pip3 install adafruit-circuitpython-dht
To install system-wide (this may be required in some cases):
.. code-block:: shell
sudo pip3 install adafruit-circuitpython-dht
To install in a virtual environment in your current project:
.. code-block:: shell
mkdir project-name && cd project-name
python3 -m venv .venv
source .venv/bin/activate
pip3 install adafruit-circuitpython-dht
Usage Example
==============
Hardware Set-up
----------------
Designed specifically to work with the Adafruit DHT series sensors:
* Adafruit `DHT22 temperature-humidity sensor + extras <https://www.adafruit.com/products/385>`_
* Adafruit `DHT11 temperature-humidity sensor + extras <https://www.adafruit.com/products/386>`_
.. note::
DHT11 and DHT22 devices both need a pull-resistor on the data signal wire. This resistor is in the range of 1k to 5k
* Please check the device datasheet for the appropriate value.
* Be sure that you are running the Buster Operating System.
* Make sure that your user is part of the ``gpio`` group.
Known Issues
------------
* The library may or may not work in Linux 64-bit platforms.
* The Raspberry PI Zero does not provide reliable readings.
* Readings in FeatherS2 does not work as expected.
.. note::
Using a more modern sensor will avoid these issues.
See the guide `Modern Replacements for DHT11 and DHT22 Sensors
<https://learn.adafruit.com/modern-replacements-for-dht11-dht22-sensors>`_.
Basics
-------
Of course, you must import the library to use it:
.. code:: python
import adafruit_dht
The DHT type devices use single data wire, so import the board pin
.. code:: python
from board import <pin>
Now, to initialize the DHT11 device:
.. code:: python
dht_device = adafruit_dht.DHT11(<pin>)
OR initialize the DHT22 device:
.. code:: python
dht_device = adafruit_dht.DHT22(<pin>)
Read temperature and humidity
------------------------------
Now get the temperature and humidity values
.. code:: python
temperature = dht_device.temperature
humidity = dht_device.humidity
These properties may raise an exception if a problem occurs. You should use try/raise
logic and catch RuntimeError and then retry getting the values after at least 2 seconds.
If you try again to get a result within 2 seconds, cached values are returned.
Documentation
=============
API documentation for this library can be found on `Read the Docs <https://docs.circuitpython.org/projects/dht/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_DHT/blob/main/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.