Theses are the team buzzer boxes which [Philippe Chrétien] built for his mother. She’s a big fan of quiz shows (we’re thinking Jeopardy and the like) and he thought she’d enjoy a proper setup for home gaming.
Each unit consists of an arcade button and one LED, both housed in a project box. He uses telephone wire to connect each buzzer to the base unit. We like that idea since we’ve got a lot of old telephone cable lying around and our RJ-45 crimp includes an RJ-11 slot. This is perfect for making our own cables.
The base unit houses an Arduino board which polls the buttons to see which is pressed first. The LED on the appropriate buzzer box is illuminated so the players know who got in first. One special feature of this setup is the ability to choose from 30 different buzzer sounds.
There are several other quiz buzzer projects kicking around Hackaday if you’re interested. One of our favorites is this system which uses plastic bowls as the buttons.