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docs/hardware/raspberry-pi.md

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+# 🥧 Raspberry Pi Systems
+
+*Raspberry Pi devices and edge computing in the homelab*
+
+## Overview
+Documentation of Raspberry Pi systems providing edge computing, IoT services, and specialized workloads.
+
+## Hardware Inventory
+
+### Raspberry Pi 5 (Primary)
+- **Model**: Raspberry Pi 5 8GB
+- **CPU**: Broadcom BCM2712 (Quad-core ARM Cortex-A76)
+- **RAM**: 8GB LPDDR4X
+- **Storage**: 128GB microSD + USB SSD
+- **Connectivity**: Gigabit Ethernet, WiFi 6, Bluetooth 5.0
+- **Ports**: 2x USB 3.0, 2x USB 2.0, 2x micro-HDMI
+
+### Raspberry Pi 4 (Secondary)
+- **Model**: Raspberry Pi 4B 4GB/8GB variants
+- **CPU**: Broadcom BCM2711 (Quad-core ARM Cortex-A72)
+- **Use Cases**: Legacy services, testing, development
+
+### Raspberry Pi Zero 2 W
+- **Model**: Ultra-compact form factor
+- **Use Cases**: IoT sensors, minimal services
+- **Connectivity**: WiFi, Bluetooth
+
+## Deployment Locations
+
+### Edge Computing Nodes
+- **Network monitoring**: Distributed monitoring points
+- **IoT gateways**: Sensor data collection
+- **Local services**: Reduce latency for local users
+
+### Specialized Roles
+- **Pi-hole DNS**: Network-wide ad blocking
+- **VPN endpoints**: Remote access points
+- **Environmental monitoring**: Temperature, humidity sensors
+
+## Operating Systems
+
+### Raspberry Pi OS
+- **Base**: Debian-based official OS
+- **Use Cases**: General purpose, desktop applications
+- **Management**: Standard APT package management
+
+### Ubuntu Server
+- **Version**: Ubuntu Server 22.04 LTS ARM64
+- **Use Cases**: Container workloads, server applications
+- **Benefits**: Long-term support, enterprise features
+
+### Specialized Distributions
+- **DietPi**: Lightweight, optimized for Pi hardware
+- **OpenWrt**: Network appliance functionality
+- **Home Assistant OS**: Dedicated home automation
+
+## Container Orchestration
+
+### Docker Deployment
+- **ARM64 containers**: Native ARM architecture support
+- **Resource constraints**: Memory and CPU optimization
+- **Storage optimization**: Minimize SD card wear
+
+### Service Categories
+
+#### Monitoring Services
+- **Node Exporter**: System metrics collection
+- **Prometheus**: Metrics storage and alerting
+- **Grafana**: Visualization dashboards
+
+#### Network Services
+- **Pi-hole**: DNS filtering and ad blocking
+- **Unbound**: Recursive DNS resolver
+- **Tailscale**: Mesh VPN connectivity
+
+#### IoT Services
+- **Home Assistant**: Home automation platform
+- **Zigbee2MQTT**: Zigbee device integration
+- **InfluxDB**: Time-series data storage
+
+## Performance Optimization
+
+### Storage Optimization
+- **USB SSD boot**: Faster than microSD
+- **Log2RAM**: Reduce SD card writes
+- **Swap optimization**: Minimize swap usage
+
+### Thermal Management
+- **Heatsinks**: Passive cooling solutions
+- **Fan control**: Active cooling when needed
+- **Thermal throttling**: Prevent overheating
+
+### Power Management
+- **Quality power supplies**: Stable 5V/3A supply
+- **UPS integration**: Uninterruptible power supply
+- **Power monitoring**: Track consumption
+
+## Network Configuration
+
+### Ethernet Connectivity
+- **Gigabit Ethernet**: Primary network connection
+- **VLAN support**: Network segmentation
+- **Static IP assignment**: Consistent addressing
+
+### Wireless Configuration
+- **WiFi 6 support**: High-speed wireless (Pi 5)
+- **Multiple SSIDs**: Network isolation
+- **Mesh networking**: Extended coverage
+
+## Monitoring & Management
+
+### System Monitoring
+- **Temperature monitoring**: Prevent thermal issues
+- **CPU/memory usage**: Resource utilization
+- **Storage health**: SD card/SSD monitoring
+
+### Remote Management
+- **SSH access**: Secure remote administration
+- **VNC/RDP**: Graphical remote access
+- **Ansible automation**: Configuration management
+
+### Health Checks
+- **Service availability**: Monitor running services
+- **Network connectivity**: Ensure network access
+- **Storage space**: Prevent disk full issues
+
+## Maintenance Procedures
+
+### Regular Updates
+- **OS updates**: Security patches and improvements
+- **Container updates**: Keep services current
+- **Firmware updates**: EEPROM and bootloader
+
+### Backup Strategies
+- **SD card imaging**: Complete system backups
+- **Configuration backups**: Service configurations
+- **Data synchronization**: Important data backup
+
+### Hardware Maintenance
+- **Cleaning**: Dust removal from heatsinks
+- **Connection checks**: Ensure secure connections
+- **Storage replacement**: SD card/SSD replacement
+
+## Use Cases
+
+### Home Automation
+- **Home Assistant**: Central automation hub
+- **Device integration**: Zigbee, Z-Wave, WiFi devices
+- **Automation rules**: Smart home logic
+
+### Network Infrastructure
+- **DNS services**: Pi-hole ad blocking
+- **VPN services**: Remote access solutions
+- **Network monitoring**: Traffic analysis
+
+### Development & Testing
+- **CI/CD runners**: Lightweight build agents
+- **Testing environments**: Isolated test systems
+- **Prototyping**: Hardware/software development
+
+## Troubleshooting
+
+### Common Issues
+- **SD card corruption**: Use quality cards, minimize writes
+- **Power issues**: Ensure adequate power supply
+- **Thermal throttling**: Improve cooling solutions
+
+### Recovery Procedures
+- **Boot issues**: Recovery mode procedures
+- **Network problems**: Reset network configuration
+- **Service failures**: Container restart procedures
+
+---
+**Status**: ✅ All Raspberry Pi systems operational with monitoring coverage