Component Details.md

Component Details

1. Raspberry Pi - Collect Array Program

Purpose: Data collection and preprocessing

Features:

• Reads environmental data from Sense Hat sensors
• Calculates rolling averages for data smoothing
• Publishes data as JSON messages via MQTT
• Runs continuously to ensure consistent data collection

Technologies:

• Python 3
• Raspberry Pi Sense Hat library
• Deque (for rolling average calculations)

2. MQTT Broker

Purpose: Central message distribution hub

Responsibilities:

• Receives sensor data from Raspberry Pi
• Routes messages to subscribers
• Handles pub/sub communication
• Manages message persistence (optional)

Configuration:

• Default port: 1883
• Topics: Configurable based on sensor types

3. Node-RED Dashboard

Purpose: Real-time data visualization and event logging

Features:

• Visual representation of sensor data
• Event logging interface for field observations
• Real-time data updates via MQTT subscription
• User-friendly dashboard for monitoring

4. Data Analysis Component

Purpose: Historical data processing and analysis

Features:

• Stores collected sensor data
• Performs statistical analysis
• Generates reports and insights
• Supports trend analysis

Data Flow

1. Data Collection → Sense Hat sensors collect environmental measurements
2. Processing → Collect Array program calculates rolling averages
3. Transmission → Data published to MQTT broker in JSON format
4. Distribution → MQTT broker routes data to subscribers
5. Visualization → Node-RED displays data in dashboard
6. Logging → Events and observations recorded in data store
7. Analysis → Historical data analyzed for patterns and insights

Key Design Principles

• Modularity - Components can operate independently
• Real-time Processing - Minimal latency in data transmission
• Scalability - Easy to add additional sensors or data consumers
• Reliability - Continuous operation and data persistence
• Open Standards - Uses MQTT and JSON for interoperability

Technologies Stack

Component	Technology
Language	Python 3
Hardware	Raspberry Pi
Sensors	Sense Hat
Messaging	MQTT
Dashboard	Node-RED
Data Format	JSON

Next Steps

• Review Hardware Setup for sensor configuration
• Explore Software Components for detailed code documentation
• Check Data Collection to understand the Collect Array program