CircuitPython support for the DHT11 and DHT22 temperature and humidity devices.
DependenciesThis driver depends on:
Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver 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 for suggestions.
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-dht
To install system-wide (this may be required in some cases):
sudo pip3 install adafruit-circuitpython-dht
To install in a virtual environment in your current project:
mkdir project-name && cd project-name python3 -m venv .venv source .venv/bin/activate pip3 install adafruit-circuitpython-dhtUsage Example Hardware Set-up
Designed specifically to work with the Adafruit DHT series sensors:
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.
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.
Of course, you must import the library to use it:
The DHT type devices use single data wire, so import the board pin
Now, to initialize the DHT11 device:
dht_device = adafruit_dht.DHT11(<pin>)
OR initialize the DHT22 device:
dht_device = adafruit_dht.DHT22(<pin>)Read temperature and humidity
Now get the temperature and humidity values
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.
DocumentationAPI documentation for this library can be found on Read the Docs.
For information on building library documentation, please check out this guide.
ContributingContributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.
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