Automating school's bell system with ESP8266

This project automates the ringing of school bells using an ESP8266 microcontroller. The system retrieves real-time from an NTP server, and users can update the bell ring times through a web interface. It's designed to be user-friendly, allowing teachers or administrators to change schedules as needed without technical knowledge.

• Real-time Clock Synchronization: Automatically syncs time using NTP to ensure accurate bell ringing.
• Web Interface: Accessible from any device connected to the same network, allowing users to update ring times easily.
• Multiple Bell Times: Supports up to 14 configurable ring times for different periods during the day.
• Relay Control: Operates a relay connected to the school bell, turning it on and off at the specified times.
• Fallback on Wi-Fi Failure: The system automatically restarts and reconnects in case of Wi-Fi connection failure.

• ESP8266 (NodeMCU)
• Relay Module
• NTP Server (pool.ntp.org) for real-time clock synchronization
• Web Server (via ESP8266WebServer library)

1. Setup: The ESP8266 connects to the Wi-Fi network using the provided credentials. It synchronizes with the NTP server to get the current time.
2. User Interface: A web interface is served at the ESP8266’s IP address. Users can access this via their phone or computer to view and update the ring times.
3. Bell Ringing: At the specified times, the relay connected to the school bell is activated, ringing the bell for a set duration (default: 10 seconds).
4. Custom Ring Times: Users can customize up to 14 ring times using the web interface.
5. Current Time Display: The web interface dynamically updates and shows the current time.

1. Connect the ESP8266: Ensure the ESP8266 is wired to a relay module controlling the school bell.
2. Upload the Code: Flash the provided Arduino code onto the ESP8266 using the Arduino IDE.
3. Configure Wi-Fi: Update the Wi-Fi credentials in the code (ssid and password) before uploading.
4. Access the Web Interface:
   • Once the ESP8266 is connected to Wi-Fi, open your browser and navigate to the ESP8266’s IP address (shown in the serial monitor).
   • Use the web form to set the desired ring times.
5. Time Synchronization: The system will automatically synchronize with the NTP server to get the current time.

• Relay Pin: D1 (Connected to the relay controlling the school bell)
• Seismometer Pin (Optional): D2 (Reserved for future earthquake detection feature)

1. ESP8266WiFi.h: For Wi-Fi connectivity.
2. NTPClient.h: For time synchronization using the NTP protocol.
3. WiFiUdp.h: To send and receive data over UDP.
4. ESP8266WebServer.h: For setting up a web server on the ESP8266.

• Seismometer Integration: In future versions, a seismometer can be added for earthquake detection, triggering an emergency alarm.
• Mobile Optimization: Improve the web interface to be more mobile-responsive for easier control on smartphones.
• Holiday/Custom Schedule Support: Add an option to input custom schedules or holiday breaks.

• Wi-Fi Connection Issues:
  • Ensure the Wi-Fi credentials are correct and that the ESP8266 is within range of the router.
  • Check the serial monitor for connection status.
• Bell Not Ringing:
  • Double-check the relay wiring.
  • Make sure the relay pin (D1) is correctly connected and receiving signals from the ESP8266.

This project was developed as a school project to demonstrate practical skills in IoT, automation, and web-based control using the ESP8266.

This project is free to use and modify for educational purposes.

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