Jeopardy buzzer controller
About the Jeopardy buzzer controller PCB
Jeopardy buzzer controller is an open source AVR/Arduino PCB design by pfroud, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 250 × 46 mm, with 13 components from 13 distinct parts.
Its main chip is the Arduino Pro Micro, from the AVR/Arduino family. By type, the board carries 3 connectors, 1 IC and 1 switch.
From the project
Buzzers for Jeopardy trivia game
Only eight buzzers are supported and the Arduino has twelve digital I/O pins, so no matrix circuit is needed.
Here are screenshots of the schematic so you don't need to download / install / launch KiCad:
Each connector has four cylindrical pins with shoulders. A rectangular tab on the bottom contacts the shell of the mating connector.
KiCad comes with symbols & footprints for 4-pin XLR connectors; I modified both slightly.
Main components on the Jeopardy buzzer controller
Jeopardy buzzer controller bill of materials (BOM)
13 components, 13 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Arduino Pro Micro | ProMicro | U1 |
| 1 | ENABLE_SW | TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J11 |
| 1 | ENABLE_LED | TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J12 |
| 1 | PWR_LED | TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J13 |
| 1 | RESET | SW_PUSH_6mm | SW1 |
| 1 | XLR1 | Jack_XLR_Neutrik_NC4MBV_Vertical_with_bigger_holes | XLR1 |
| 1 | XLR2 | Jack_XLR_Neutrik_NC4MBV_Vertical_with_bigger_holes | XLR2 |
| 1 | XLR3 | Jack_XLR_Neutrik_NC4MBV_Vertical_with_bigger_holes | XLR3 |
| 1 | XLR4 | Jack_XLR_Neutrik_NC4MBV_Vertical_with_bigger_holes | XLR4 |
| 1 | XLR5 | Jack_XLR_Neutrik_NC4MBV_Vertical_with_bigger_holes | XLR5 |
| 1 | XLR6 | Jack_XLR_Neutrik_NC4MBV_Vertical_with_bigger_holes | XLR6 |
| 1 | XLR7 | Jack_XLR_Neutrik_NC4MBV_Vertical_with_bigger_holes | XLR7 |
| 1 | XLR8 | Jack_XLR_Neutrik_NC4MBV_Vertical_with_bigger_holes | XLR8 |
Jeopardy buzzer controller design files
The KiCad project lives in the pfroud/jeopardy-buzzer-controller repository on GitHub; these links point at the commit this page was built from.
Jeopardy buzzer controller: common questions
What microcontroller does the Jeopardy buzzer controller use?
The Jeopardy buzzer controller is built around the Arduino Pro Micro, from the AVR/Arduino family.
How big is the Jeopardy buzzer controller PCB?
The Jeopardy buzzer controller measures 250 × 46 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Jeopardy buzzer controller?
13 components, from 13 distinct parts. The full bill of materials is listed on this page.
Where can I download the Jeopardy buzzer controller design files?
From the pfroud/jeopardy-buzzer-controller repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Jeopardy buzzer controller design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which pfroud chose for the repository.
Can I test firmware for the Jeopardy buzzer controller without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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