# TTDS (Time Table Display System) — Real-Time Campus Timetable & Digital Notice Engine

> **System Definition**: Envordo TTDS is a hardware-agnostic digital campus signage and automated bell engine that converts any consumer Smart TV, FireStick, Android TV, or interactive smartboard into a real-time school timetable display, substitution ticker, and dynamic notice board in 60 seconds.

## Operating Modes

### 1. Reception Multi-Wing Flight Board Mode
- High-density multi-column flight schedule board designed for 55"-75" screens in lobbies and foyers.
- Presents all grade sections (Primary, Middle, Senior) with live status badges (`IN SESSION`, `SUBSTITUTION`, `RECESS`).
- Dynamic 6-row circular dwell pagination with smooth visual transitions.
- Integrated celestial weather canvas synchronized with local campus meteorology.
- Continuous bottom ticker tape for daily circulars and urgent notices.

### 2. Corridor Door Countdown Mode
- Flush-mounted outside classroom doors or wing hallways.
- Large pulsing circular countdown ring indicating minutes remaining in class.
- Displays current teacher avatar/name, subject, room number, and an "Up Next" preview.
- 2-minute wrap-up amber warning zone gives teachers and students a 120-second wrap-up signal.

### 3. Staff Room Substitution Hub
- High-visibility dashboard for the teachers' lounge.
- Flashes real-time morning substitution assignments immediately upon coordinator approval.
- Displays free teacher slots, room shifts, and duty schedules.

## Technical Specifications
- **Sync Speed**: WebSocket push delivers schedule changes campus-wide in under 15 milliseconds.
- **Pairing**: Navigate to `envordo.app/tv`, get an 8-digit PIN, and connect via `Settings > Displays`. No logins or keyboards needed on TVs.
- **Hardware Compatibility**: Amazon Fire TV Stick ($25 / ₹2,499), Android Smart TV ($120 / ₹10,999), Classroom Smartboards (Promethean, ViewSonic, MAXHUB), Raspberry Pi.
- **Resilience**: In-browser local storage keeps the full daily timetable, countdowns, and harmonic bells operating 100% offline during internet outages.
- **Safety Takeover**: 1-click administrative campus takeover flashes emergency banners with audible alert beacons.