EngEx Crowd Balance Mobile App
Table of Contents
Introduction
A smart crowd management mobile app developed for the 75th Anniversary Exhibition (PeraVerse) at the University of Peradeniya. The EngEx Crowd Balance Mobile App offers real-time crowd monitoring, missing person alerts, car park tracking, and AI chatbot support to ensure efficient event management.
Project Goals:
- Efficiently monitor and manage crowd flow across the exhibition
- Quickly locate and assist missing persons
- Ensure smooth communication between organizers and main panel
- Optimize car park and hall usage to prevent overcrowding
- Provide real-time data to improve decision-making during the event
Technology Stack: React Native, Expo, MongoDB, Express.js, and Node.js
Key Features
1. Real-Time Crowd Management System
The app supports two types of users: Organizers and Main Panel.
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Update Current Crowd Status (Organizers): Organizers can instantly update crowd status based on current conditions at their assigned locations.
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Assign Organizers to High-Crowded Areas (Main Panel): The main panel receives real-time crowd data and can efficiently assign available organizers to specific locations based on current needs.
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Send Actionable Notifications: The system directly notifies organizers of their new location assignments and critical crowd levels, prompting rapid and informed responses.
2. Missing Person Alert System
- Create Missing Person Alerts: Any authorized user can create a new missing person alert by filling in crucial details including:
- Name, Age, Gender
- Last seen location
- Photo (optional)
- Description summary (optional)
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Real-Time Alert Display: Once created, the alert is immediately visible to all teams, displaying the person’s details and last known location.
- Mark as Found: With a single tap, users can mark the person as “FOUND,” instantly closing the alert loop and notifying all relevant parties.
3. Car Park Management System
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Real-Time Status Dashboard: Gain instant visibility into the real-time status of all parking areas, clearly showing capacity and availability for each lot.
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Update Car Park Count (Organizers): Organizers on the ground can quickly adjust vehicle counts using ‘+’ and ‘-‘ buttons as cars enter and exit, ensuring accurate status updates and preventing overcrowding.
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Add and Remove Car Parks (Main Panel): The main panel can dynamically manage parking areas based on exhibition requirements.
4. AI Chatbot (Web App Feature)
- Instant Support: Provides instant access to critical event information through a built-in chatbot powered by n8n workflow automation.
- Knowledge Base Assistant: Capable of answering common questions such as event schedules, location details, and general exhibition information.
Software Architecture
Three-Tier Architecture
Frontend (React Native + Expo):
- Interactive dashboards for organizers and main panel users
- File-based navigation using Expo Router for clean, maintainable routing
- Styling with TailwindCSS core utility classes
Backend (Node.js + Express.js):
- RESTful API handling logic, authentication, and data flow
- MVC (Model-View-Controller) architecture pattern for organized, maintainable, and scalable code
- Hosted on Microsoft Azure for reliable performance
Database (MongoDB Atlas):
- Cloud-based, secure data storage
Deployment
Mobile App
- Platform: Built using Expo
- Availability:
- Android APK (fully built and tested)
- Expo Go client (iOS and Android)
Download Android APK:
DOWNLOAD APP
Click here to Download the APK
Scan QR to Download the APK
Note: iOS deployment was successfully tested via Expo Go app, but a dedicated iOS IPA was not built due to platform constraints and limitations.
Backend
- Hosting: Microsoft Azure (Students)
API Documentation
- Postman Collection: API Documentation
Database
- Service: MongoDB Atlas (cloud-based, managed database)
User Manual
Download the complete user manual:
Click the link above to access the complete user manual with step-by-step instructions for using the EngEx Crowd Balance Mobile App.
Team
- E/21/444, Wijesinghe R.M.S.D, e21444@eng.pdn.ac.lk
- E/21/045, Baines S.M, e21045@eng.pdn.ac.lk
- E/21/065, Chamod S.A.R, e21065@eng.pdn.ac.lk
- E/21/277, Padukka V.K, e21277@eng.pdn.ac.lk
Supervisors
- Ms. Yasodha Vimukthi, yasodhav@eng.pdn.ac.lk