opensensor-enviroplus 0.2.1

Modern CLI-based environmental sensor collector using Polars, Arrow, and Delta Lake for Enviro+

OpenSensor Enviroplus

Modern, CLI-based environmental sensor data collector using Polars, Apache Arrow, and Hive-partitioned Parquet for Raspberry Pi Enviro+.

Part of the OpenSensor.Space network for open environmental data.

Features

• UUID v7 Station IDs: Time-ordered UUIDs for better database performance
• Modern Stack: Polars streaming, Apache Arrow, Hive-partitioned Parquet
• Memory Efficient: Optimized for Raspberry Pi with limited RAM
• CLI-First: Simple Python commands replace bash scripts
• Smart Logging: Rich console output for easy debugging
• Cloud Sync: Built-in sync using obstore (50% faster than boto3)
• Prefix-based IAM: S3 bucket access control per station
• Type Safe: Pydantic settings with validation
• Production Ready: Graceful error handling, automatic retries
• Browser-queryable: DuckDB-wasm compatible Parquet output

Quick Start

Prerequisites

# Update system packages
sudo apt-get update

# Install git
sudo apt-get install -y git

# Install UV package manager (fast Python package manager)
curl -LsSf https://astral.sh/uv/install.sh | sh
source $HOME/.cargo/env

Installation

# Clone the repository
git clone https://github.com/walkthru-earth/opensensor-enviroplus.git
cd opensensor-enviroplus

# Install dependencies with UV
uv sync

# Activate virtual environment (optional - uv run handles this)
source .venv/bin/activate

Setup

# Interactive setup (creates .env configuration)
opensensor setup

# Or non-interactive
opensensor setup --station-id "01234567-89ab-cdef-0123-456789abcdef" --no-interactive

Usage

Run as Systemd Service (Recommended)

# Quick setup (install + enable + start) - automatically handles sudo
opensensor service setup

# View service status
opensensor service status

# View live logs
opensensor service logs --follow

# Restart service
opensensor service restart

# Stop service
opensensor service stop

# Complete removal
opensensor service remove

Note: Service commands automatically request sudo when needed.

Manual Commands

# Start collecting data
opensensor start

# Run in foreground (for debugging)
opensensor start --foreground

# View status
opensensor status

# Sync to cloud
opensensor sync

# View logs
opensensor logs

# Follow logs in real-time
opensensor logs --follow

# View configuration
opensensor config

Service Management

The service commands automatically detect your user, project path, and virtual environment:

# View auto-detected configuration
opensensor service info

# Individual service commands (automatically handle sudo)
opensensor service install    # Create systemd service
opensensor service enable     # Enable on boot
opensensor service start      # Start service
opensensor service stop       # Stop service
opensensor service restart    # Restart service
opensensor service disable    # Disable on boot
opensensor service uninstall  # Remove service

Configuration

Configuration via .env file (auto-generated by opensensor setup):

# Station identification (UUID v7 - auto-generated)
OPENSENSOR_STATION_ID=019ab383-d789-74e2-a460-bb92b1c13681

# Data collection
OPENSENSOR_READ_INTERVAL=5              # Seconds between sensor reads
OPENSENSOR_BATCH_DURATION=900           # 15-minute batches

# Temperature compensation (for Raspberry Pi CPU heat)
OPENSENSOR_TEMP_COMPENSATION_ENABLED=true
OPENSENSOR_TEMP_COMPENSATION_FACTOR=2.25

# Output settings
OPENSENSOR_OUTPUT_DIR=output
OPENSENSOR_COMPRESSION=snappy           # Fast compression (snappy, zstd, gzip)

# Cloud sync (optional)
OPENSENSOR_SYNC_ENABLED=true
OPENSENSOR_SYNC_INTERVAL_MINUTES=15

# S3/MinIO storage
OPENSENSOR_STORAGE_BUCKET=my-sensor-bucket
OPENSENSOR_STORAGE_PREFIX=sensors/station-019ab383  # For IAM scoping
OPENSENSOR_STORAGE_REGION=us-west-2
OPENSENSOR_STORAGE_ENDPOINT=            # Optional: for MinIO/custom S3

# AWS credentials
OPENSENSOR_AWS_ACCESS_KEY_ID=AKIAIOSFODNN7EXAMPLE
OPENSENSOR_AWS_SECRET_ACCESS_KEY=wJalrXUtnFEMI/K7MDENG/bPxRfiCY

# Logging
OPENSENSOR_LOG_LEVEL=INFO
OPENSENSOR_LOG_DIR=logs

See .env.example for a complete template with IAM policy examples.

Architecture

Data Flow

Sensors (5s) -> Polars Collector -> Hive-Partitioned Parquet (15min) -> S3/MinIO (obstore)

Output Format (Hive-Partitioned Parquet)

output/
  station=019ab383-d789-74e2-a460-bb92b1c13681/
    year=2025/
      month=11/
        day=24/
          data_1430.parquet  # Batch written at 14:30
          data_1445.parquet  # Batch written at 14:45

Benefits:

• Browser-queryable with DuckDB-wasm
• Partition pruning for fast time-range queries
• Simple, universal format (no proprietary transaction logs)
• Perfect for append-only time-series data

See ARCHITECTURE.md for detailed diagrams and scalability analysis.

Differences from Original

Feature	Old (enviroplus-python)	New (opensensor-enviroplus)
Station IDs	Manual/random	UUID v7 (time-ordered)
Data library	pandas + DuckDB	Polars + Apache Arrow
Storage	Partitioned Parquet	Hive-partitioned Parquet
Configuration	bash scripts + env vars	Pydantic Settings + .env
Setup	install.sh	opensensor setup CLI
Cloud sync	rclone (process spawn)	obstore (Rust, 50% faster)
IAM policies	N/A	Prefix-based scoping
Logging	print statements	Rich + structured logging
Memory usage	Higher (pandas)	50% lower (Polars streaming)
CLI	None	Typer with 7 commands
Read interval	1 second	5 seconds (configurable)
Batch duration	Variable	15 minutes (900s)

Development

# Install with dev dependencies
uv sync --group dev

# Format code
uv run ruff format .

# Lint code
uv run ruff check .

# Run with UV (no venv activation needed)
uv run opensensor --help

Tech Stack

• Python 3.10+ - Modern Python with type hints
• UV - Fast Rust-based package manager (10-100x faster than pip)
• Polars 1.35+ - High-performance DataFrames with streaming
• PyArrow 22+ - Columnar memory format (zero-copy operations)
• uuid6 - RFC 9562 UUID v7 implementation
• obstore - Rust-powered object storage (S3/GCS/Azure)
• Pydantic Settings - Type-safe configuration
• Typer + Rich - Beautiful CLI with auto-completion
• Ruff - Extremely fast Python linter and formatter

License

MIT License - see LICENSE file for details

Credits

Built by the WalkThru Earth team for the OpenSensor.Space network.

Dependencies:

• enviroplus-community - Enviro+ sensor drivers
• Polars - Lightning-fast DataFrames
• obstore - Object storage abstraction
• Typer - CLI framework
• Rich - Terminal formatting
• Pydantic - Data validation

Contributing

Contributions welcome! Please:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Run tests and linting (uv run ruff check .)
4. Commit your changes (git commit -m 'feat: add amazing feature')
5. Push to the branch (git push origin feature/amazing-feature)
6. Open a Pull Request

Support

• Issues: GitHub Issues
• Discussions: GitHub Discussions
• Documentation: ARCHITECTURE.md