Buzzer

A realtime buzzer app that works within LAN, without internet connection, for use with Quiz competitions. Any smartphone can be used as the client.

npm install
node server.js

Screen

• User Screen - http://localhost:3000
• Main Screen - http://localhost:3000/main
• Admin Screen - http://localhost:3000/admin

Password

Default admin password is secret. Can be configured via the environment variable ADMIN_PASSWORD.

Features

• Works without internet access
• Admin approval for registations
• Announces the name of winner via TTS
• Remembers registration across page load
• Accidental reload protection

Flow

• Users (client) registers their team by opening the User screen.
• Admin approves the teams from the admin screen.
• The main screen will be displayed using Projector / LED screen to display the results.
• Admin resets the buzzer before each question from the admin screen.

Recommendation

• Run in local Wireless LAN (WiFi network) with static IP for the server machine.
• Distribute the WiFi network name, and server url as QR code for easy client setup.
• Place the mobile phone in Do not disturb (DND) mode, to prevent calls during competition.
• Ensure that mobile phone screen has the longest timeout to prevent the screen from locking during competition.