Reaction Speed Game Kit (2 Players) – Arduino Uno
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Prices updated: 13 Oct 2026
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About this product
A two-player reaction game: a red LED signals get ready, then after a random delay a buzzer sounds, and the first player to press their button wins the point and lights their green LED. Pressing before the signal loses the point. Reaction times in milliseconds and the scores are shown on the Serial Monitor.
Specifications
- Players
- 2
- Reaction time unit
- Milliseconds
- Output
- Serial Monitor
- Functions used
- random() and millis()
- Controller board
- Arduino Uno R3 Compatible (ATmega328P)
- Soldering required
- No
- Level
- Easy
- Estimated time
- 45 minutes
Frequently asked questions
How is the reaction time measured?
The code uses millis() to measure the time between the start signal and the first button press, then prints the result in milliseconds on the Serial Monitor.
What happens if a player presses too early?
That player loses the point, because the program checks for button presses that happen before the buzzer sounds.
