CircuitPython support for DHT11 and DHT22 type temperature/humidity devices
This 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.
Installing from PyPI
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 .env source .env/bin/activate pip3 install adafruit-circuitpython-dht
Designed specifically to work with the Adafruit DHT series sensors:
- Adafruit DHT22 temperature-humidity sensor + extras
- Adafruit DHT11 temperature-humidity sensor + extras
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 Buster Operating System.
- Make sure that your user is part of the gpio group.
- Library may or may not work in Linux 64-bit platforms
- 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
from board import <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.
API documentation for this library can be found on Read the Docs.
Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.
For information on building library documentation, please check out this guide.
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