BME280 Temperature Logger

A long-running sensor logger for a BME280 environmental sensor connected to a Raspberry Pi 4 Model B.
The system continuously records temperature, humidity, and pressure data. The logger runs as a systemd service, writes data locally to SQLite, and can be inspected or extended without requiring network access.

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Implemented Features

• Runs continuously as a systemd service
• Automatically starts on boot
• Logs errors to the system journal (journald)

Each reading includes:

• Timestamp (UTC)
• Temperature
• Humidity
• Pressure

Stored locally in a SQLite database file for easy querying and export.

Error Handling

• Graceful handling of sensor read failures
• Database errors logged to the system journal
• Retry behavior to avoid failure loops

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Running as a Service

The logger is managed via systemd. Logs can be viewed with:

journalctl -u bme280_logger

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Requirements

• Raspberry Pi (tested on Raspberry Pi 4)
• Raspberry Pi OS
• BME280 sensor (I²C)
• Python 3
• SQLite (sqlite3)

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Future Improvements

• Rotating CSV exports (daily / weekly)
• JSON or Parquet export for analysis
• Cloud backups (Google Drive, AWS S3, Dropbox)??
• Local plots using matplotlib or Plotly
• Real-time dashboards with Dash
• Web UI using Flask or FastAPI
• Aggregations (daily averages, min/max)
• Anomaly detection
• Long-term trend analysis