cjee21 / RPi-DHT20

Raspberry Pi Python library for DHT20 Temperature and Humidity Sensor with CRC verification.

RPi-DHT20

Raspberry Pi Python library for DHT20 Temperature and Humidity Sensor with CRC verification.

Requirements

This library was tested with the following:

• Aosong DHT20 SIP Packaged Temperature and Humidity Sensor
• Raspberry Pi 3 Model B
• Ubuntu Server 22.10, 23.04, 23.10 and 24.04 LTS

Similar configurations should also work.

Set up

1. Connect the DHT20 sensor to the Raspberry Pi
   Note: If a different Raspberry Pi model and/or operating system is used, it may be necessary to change the I2C_BUS in DHT20_demo.py and/or enable the I²C interface.

2. Install smbus2 Python module that is used for accessing the I²C bus

   sudo apt install python3-smbus2
   

3. If /dev/i2c* does not exist, enable the i2c-dev kernel module by adding the following line to the /etc/modules file

   i2c-dev
   

4. Test by running the demo

   sudo python3 DHT20_demo.py
   

Usage

Refer to the usage example in DHT20_demo.py.

References

• Aosong DHT20 datasheet
• Aosong AHT20 sample program
• DFRobot_DHT20 Raspberry Pi library