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Roulette is a casino game named after the French word meaning little wheel which was likely developed from the Italian game Biribi. In the game, a player may choose to place a bet on a single number, various groupings of numbers, the color red or black, whether the number is odd or even, or if the numbers are high (19–36) or low (1–18). To determine the winning number, a croupier spins a wheel in one direction, then spins a ball in the opposite direction around a tilted circular track running around the outer edge of the wheel.

There are two popular roulette wheels: American and European. The European wheel has only one zero while the American wheel has two zeroes. Also the number sequence is different.

This time I will present you how to make an electronic version European roulette, where the movement of the ball is simulated by successive lighting of LEDs.

This time is used the Charlieplexing technique, also known as tristate multiplexing, reduced pin-count LED multiplexing, complementary LED drive and crossplexing. This is a technique for driving a multiplexed display in which relatively few I/O pins on a microcontroller are used to drive an big array of LEDs.

Thanks to this technique, the 74HC595 shift registers are omitted this time and the device is incredibly simple to build. It contains only a few components:

- Arduino Nano microcontroller
- 37 Leds
- five resistors
- Button,
- and Speaker”

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