Show HN: Offline ESP32 that displays a new QR code every 30 seconds

Proof of Presence and Location Using ESP32 Devices

This project uses ESP32 microcontrollers to generate cryptographic proof of presence and location, creating a new unique QR code every 30 seconds. Time synchronization is handled through the GPS module, enabling completely offline operation. It combines hardware (ESP32), backend (Flask), and frontend (Leaflet.js) to create a seamless experience for tracking and validating device locations.

The website is hosted at localproof.org.

• ESP32 Integration: Devices generate encrypted QR codes with GPS coordinates and TOTP codes.
• Real-Time Map: Interactive map showing device locations and validation attempts.
• Secure Validation: AES-256 encryption and TOTP-based validation for tamper-proof data.
• Scalable Backend: Flask-powered API with SQLite database for storing devices and logs.

• esp32/: Code for ESP32 devices and Python-based simulators.
• website/: Flask backend and frontend for the web app.
• README.md: This file.
• LICENSE: Project license.

• Python 3.8+
• Flask
• SQLite
• ESP32 development environment (Arduino IDE or PlatformIO)

1. Clone the repository:

   git clone https://github.com/your-username/localproof.git cd localproof

2. Setting up virtual environment & install requirements:

   python -m venv venv source venv/bin/activate pip install -r requirements.txt

3. Create database and run the Flask app:

   cd website python create_database.py python app.py

4. Access the website at http://localhost:5005.

The ESP32 code and simulators are located in the esp32/ directory. Refer to the ESP32 README for details on setting up and running the code.

Contributions are welcome!

This project is licensed under the MIT License. See the LICENSE file for details.