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Quiz Buzzer System

Overview

This project is a wireless quiz buzzer system designed for quiz games where participants answer questions by pressing their respective buzzers. The system consists of multiple buzzers and a central controller that connects to an external speaker.

Components

Wireless Buzzers

  • Microcontroller: Wemos D1 Mini
  • Power: 9V battery with a voltage converter to 5V
  • Communication: ESP-NOW
  • Enclosure: Custom 3D printed cases

Central Controller

  • Microcontroller: NodeMCU ESP32
  • Audio: DFPlayer Mini MP3 player, plays a unique sound corresponding to each buzzer when pressed
  • Communication: Receives signals from the buzzers using ESP-NOW

Software

The project is developed using Visual Studio Code with PlatformIO.

Setup and Installation

Prerequisites

  • Visual Studio Code
  • PlatformIO plugin for VSCode

Steps

  1. Clone the Repository: 
    git clone https://github.com/orcohen9826/Buzzer.git
  2. Open in VSCode: Navigate to the project folder and open it using VSCode.
  3. Install Dependencies: Ensure all libraries and dependencies are installed through PlatformIO.
  4. Upload Code: Upload the code to the Wemos D1 Mini devices for the buzzers and the NodeMCU ESP32 for the central controller.
  5. Copy Sound Files: Copy the sound files to a memory card in a folder named "mp3". The first file will correspond to Buzzer 1, the second file to Buzzer 2, and so on.
  6. Initial System Boot: On first boot, connect the central controller and read its serial monitor. When a buzzer is pressed for the first time, its MAC address will be printed to the console. Assign the MAC addresses to the respective buzzers in the central controller's code.
  7. Hardware Setup: Connect the 9V batteries to the buzzers and set up the central controller with the DJ system.
  8. Test: Ensure that the buzzers communicate with the central controller and that each buzzer press triggers a unique sound to be played through the DJ system.

Usage

  • Buzzers: Participants press the buzzer during the quiz. The signal is sent wirelessly to the central controller.
  • Central Controller: Upon receiving a signal, the central controller plays a unique sound corresponding to the pressed buzzer through the DJ system.

Contributing

Feel free to fork the project and submit your contributions through pull requests.