The idea for this project was to log the dht sensor output data over time. I have succsessfully integrated the dht-22 sensor via Homebridge into Homekit, but there wasn't any abillity to log the sensor data over the course of time.

• Raspberry Pi Zero WH plus DHT-22 sensor: This combination logs the temperature and humidity data every 5 minutes. In addition the cpu temperature of both Raspberrys is also stored in the database. The record intervall can be adjusted in klima_logger.py. The data is going to be stored in a sqlite file.

• Raspberry Pi 4B: This Raspi runs the local flask-server and pulls the database from the Raspi Zero. I tried to run the flask-server on the Raspi Zero but that was way too slow (due to the lack of RAM).

• The connection between the Raspi Zero and Raspi 4B is handled via SSH through the package paramiko.

• The interactive charts are created with pygal.

1. Transfer and start the script klima_logger.py to the Raspi Zero
2. Transfer the app data to another Raspi with enough RAM
3. Adjust the script config.py with your local settings
4. Run pip install -r requirements.txt
5. Run main.py
6. Open 127.0.0.1:8000/dashboard