Raspberry Pi QR Code Scanner: Attendance and Access

Attendance and Access

Introduction and Use Cases

Build a QR code-based attendance or access control system with your Raspberry Pi. Here are the key reasons to use a Raspberry Pi for this project:

• Cost effective: Build for a fraction of commercial solutions.
• Fully customisable: Adapt every aspect to your needs.
• Educational: Learn real-world skills applicable to your career.
• Community support: Massive community with tutorials and forums.

Hardware Requirements

• Raspberry Pi 4 or 5 (4GB+ recommended)
• MicroSD card (32GB+) or NVMe SSD
• Reliable power supply (official USB-C PSU recommended)
• Ethernet connection for network-dependent projects
• Appropriate case with cooling for 24/7 operation

Software Installation

# Update your Raspberry Pi first
sudo apt update && sudo apt full-upgrade -y

# Install project-specific dependencies
# Detailed commands follow in subsequent sections

Always start with a fresh, updated Raspberry Pi OS installation for best results.

Configuration and Setup

Configuration involves setting up the core application, adjusting parameters for your specific use case, and ensuring everything is secured for production use.

# Edit the main configuration file
sudo nano /etc/project-config.conf

# Key settings to configure:
# - Network interface and ports
# - Authentication and security
# - Logging and monitoring
# - Performance tuning for Pi hardware

Testing and Validation

Before deploying, verify every component works correctly:

# Run the built-in test suite
python3 -m pytest tests/

# Check service status
sudo systemctl status project-service

# Verify network connectivity
curl -v http://localhost:8080/health

Advanced Features

Once the basics are working, explore these advanced features:

• Custom dashboards and monitoring
• Integration with other services (Home Assistant, MQTT, Telegram)
• Automated backups and failover
• Performance optimisation for Raspberry Pi ARM architecture

Troubleshooting Tips

Common issues and their solutions:

• Service fails to start: Check logs with journalctl -u service-name -f
• Permission denied: Ensure the Pi user has appropriate group memberships
• Out of memory: Increase swap or add a swap file on an SSD
• Slow performance: Switch from microSD to NVMe SSD for I/O-intensive applications

Frequently Asked Questions

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