This is a CS 145 capstone project and an entry to "IoT Cup: Artificial Intelligence in the Internet of Things (AIoT) for Smart Cities and Sustainable Development" under the Department of Computer Science, University of the Philippines Diliman, where it won 2nd place out of 19 participants.
3Pings is an IoT-powered smart bicycle-sharing platform designed to promote sustainable urban mobility. It features intelligent docking racks equipped with RFID readers and servo motor locks, a centralized backend server, and a user-centric mobile app that enables efficient and secure bike rentals and returns.
By focusing on smart infrastructure instead of smart bikes, 3Pings improves system scalability, cost-effectiveness, and reliability—addressing common problems in traditional bike-sharing systems such as uneven bike distribution and manual operations.
- RFID-enabled Smart Racks: Each slot detects bike presence using RFID and manages locking mechanisms with servo motors.
- Mobile/Web App: Users can view available hubs, reserve a bike, rent and return seamlessly, and track ride history.
- Incentive System: Users earn credits for returning bikes to under-supplied locations, encouraging balanced distribution.
- Centralized Backend: Real-time synchronization of hardware status, trip history, and reward credits via a cloud-connected server.
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Hardware Layer:
- 🧠 ESP32 controller handles RFID detection, servo control, and network communication.
- 🔐 MFRC522 RFID reader detects bike tags per slot.
- 🔄 SG-90 Servo Motor for locking/unlocking bike slots.
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Backend Layer:
- Hosted on Heroku, with endpoints for bike rental, return, rack status, and user reward logic.
- Syncs real-time data with Firebase.
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Client Layer:
- Android-compatible app with bike hub map, trip management, and in-app wallet/reward display.
- Reservation: User selects a rack with available bikes; a bike is reserved.
- Rental: User initiates rental; servo unlocks corresponding slot.
- Ride: Bike is used; status changes to
Rented. - Return: User docks bike in another rack; correct RFID is verified.
- Rewards: Incentives are awarded if the return hub is in high demand.
- Payment: Users can pay via linked e-wallet or use in-app credits.
- View real-time hub availability and status
- Reserve bikes in advance
- Scan and rent bikes on demand
- Return bikes with verification
- Track trips and payments
- Claim rewards through "missions"
Core logic includes:
setup()– Initializes Wi-Fi, rack ID, and hardware components.loop()– Listens for rental and return commands.rent()– Unlocks bike and verifies pickup.ret()– Verifies RFID upon return, validates correctness.- Includes routes like
/ping,/rent, and/return.
- ESP32 Microcontroller
- RFID (MFRC522) Module
- Servo Motors (SG-90)
- React Native (App)
- Express.js (Server)
- Firebase (Database)
- Heroku (Server Hosting)
- Ngrok (for tunneling during testing)
Conceptualized, designed, and built with ❤️ by CS 145 AY 2024-2025 students:
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Hardware
- Pamella Jei Dela Rosa
- Katrina Ann Mislang
- Gian Mark Santos
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Software
- Bea Alessi Yukdawan
- Julia Ysobel Pineda
- Arturo Miguel Saquilayan
This project is for educational and research purposes only. All rights reserved.
Special thanks to the CS 145 faculty and organizers of the IoT Cup 2025, as well as the Prof. Wilson M. Tan for their guidance and support throughout the development of this project.