This application measures temperature and humidity with a DHT22/AM2302 sensor connected to the Raspberry Pi.
The sensor is read out with a Python script and the library Adafruit_CircuitPython_DHT. The measurement data is displayed in the console and can optionally be save to a database (MariaDB) and displayed on a web server.

• Raspberry Pi
• Raspberry Pi OS (previously called Raspbian), Version: 10 buster / 11 bullseye
• Sensor: DHT22 (AM2302) (Buy: int./de)
• optional: Docker & docker-compose

It use physical PIN7 = GPIO4 (D4) by default. You can now* change the GPIO Pin over a env-Variable (see below). The other two cable of AM2302 are connect to 3V (or 5V) and Ground.

# Clone Project 
git clone https://github.com/Tob1as/rpi-sensors.git
# change in folder
cd rpi-sensors/

Use Docker (recommended) or manual installation.

Requirements:

• installed Docker
• installed Docker-Compose
• Help? Use my install Script for that.
• Note: This was developed and tested on a Raspberry Pi 3. On 4 it run when you set PRIVILEGED_MODE_ENABLE=true in .env-File (see below).

Steps:

1. copy env-File:

   cp example.env .env

2. change settings in .env-File, example Database Password or GPIO Pin. Then optional check config:

   docker-compose config

3. Run:

   docker-compose up -d

   or:

   docker-compose up -d mariadb dht22 web

4. [optional] Logs:

   docker-compose logs -f

5. [optional] Stop:

   docker-compose down -v

1. Install requirements:

   sudo apt-get update
   sudo apt-get install -y build-essential python3-dev libgpiod2 libmariadb-dev
   sudo pip3 install adafruit-blinka==8.43.0
   sudo pip3 install adafruit-circuitpython-dht==4.0.5
   sudo pip3 install mariadb==1.1.10
   sudo pip3 install paho-mqtt==2.1.0

2. Setup local or external MariaDB/MySQL.
3. Export Variable in example.env-File or change default value in dht_sensor.py.
4. Run:

   python3 ./dht_sensor.py

5. Optional: Copy html-Folder into Webserver with installed PHP-Modul and change database settings in php file.

If your container (example: web) fails to start with Images that based on Alpine 3.13 on ARM devices like Raspberry with Raspbian Buster (32 bit) then see here or here or here for a possible solution.

• DockerHub for Container/Docker Image
• GitHub for Sourcecode and configuration