magoulet/temperature-logger

Temperature Logger

This project logs temperature and humidity data from a AHT20 (or AM2301B) sensor connected to a Raspberry Pi and stores the data in a MariaDB database. The data is collected every 10 minutes using a cron job.

Requirements

• Raspberry Pi with I²C enabled
• Python 3.7+
• Virtual environment (venv)
• MariaDB server
• Required Python packages:
  • adafruit-circuitpython-ahtx0
  • pymysql

Setup

1. Clone the Repository

git clone https://github.com/magoulet/temperature-logger.git
cd temperature-logger

2. Create and Activate a Virtual Environment

python3 -m venv .venv
source .venv/bin/activate

3. Install Required Packages

pip install adafruit-circuitpython-ahtx0 pymysql

Configuration

Copy config.py.example to config.py and update according to your needs.

Running the Script

1. Create the Shell Script

Copy run_script.sh.example to run_script.sh and update according to your setup details.

2. Make the Shell Script Executable

chmod +x run_script.sh

3. Test the Script Manually

run_script.sh

Setting Up Cron Job

1. Open the crontab configuration:

crontab -e

2. Add the following line to run the script every 10 minutes:

*/10 * * * * /home/user/projects/temperature-logger/run_script.sh | logger -t temperature-logger

making sure to update the path based on your local setup.

Viewing Logs

Using journalctl on Systemd

• View logs:

journalctl -t temperature-logger

• Follow logs in real-time:

journalctl -t temperature-logger -f

Using syslog

• View logs:

grep "temperature-logger" /var/log/syslog

• Follow logs in real-time:

tail -f /var/log/syslog | grep "temperature-logger"

License

This project is licensed under the MIT License.