VibroMeter

Key Features

1. Live Vibrometer

- High-Precision Sampling: Processes accelerometer data ($m/s^2$) at a 50Hz sampling rate.
- Dual Display: Features a central analog gauge paired with real-time digital readings in mg and Mercalli scale.
- Visual Indicators: Dynamic color-coding based on intensity: Green (Safe) → Yellow → Orange → Red (Severe).

2. 3-Axis Graph Recorder

- Real-time Visualization: Scrollable line chart displaying X/Y/Z acceleration for the last 60 seconds.
- Peak Hold Mode: Toggle ON/OFF to lock and track maximum recorded values.
- Intuitive Controls: Dedicated buttons for Pause, Resume, and Reset for seamless data management.

3. Session Report & History

- Detailed Summaries: Post-session cards detailing start/end times, peak/average values, and estimated Mercalli intensity.
- Data Export: "Export to CSV" functionality via the system share sheet (Email, Messaging, Cloud, etc.).
- Smart Storage: Automatically saves the last 10 sessions using local SharedPreferences/SQLite.
- Instant Restart: "New Session" button allows for an immediate return to the Home screen and auto-starts a new recording, bypassing traditional navigation delays.
- Archive Access: Revisit past reports anytime through the dedicated History screen.

4. Smart Threshold Alarm

- Customizable Sensitivity: Slider-adjustable alarm thresholds from 10 to 500 mg (Default: 150 mg).
- Precision Trigger: Activates when acceleration magnitude $|a|$ exceeds the threshold for 3 consecutive samples (~60ms) to prevent false positives.
- Dual Alert System: 1. Haptics: Strong vibration pattern (500ms ON / 200ms OFF × 3).
2. Sound: 0.8s high-alert warning tone played via `audioplayers`.
- Cooldown Mechanism: 5-second "cool-down" period after each trigger to prevent repetitive alarm loops.
- Quick Toggle: Instant Alarm ON/OFF switch via the 🔔 icon on the main dashboard.
- Event Logging: All trigger events are automatically marked on the session report timeline for later analysis.