Electronic game LED thimbles on the microcontroller. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electronic game LED thimbles on the microcontroller. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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This electronic device simulates the game "Thimble". Used as thimbles LEDs. The leading player is the microcontroller. The playing field consists of 7 LEDs and is arranged in three rows (Fig. 2). The central row represents thimbles, which are rearranged during the game. The rest of the LEDs are used to indicate the direction of the permutation. The meaning of the game is to track the movement of the original LED (ball) and determine its position at the end of the permutations.

The game has 7 difficulty levels, which differ in the number and speed of permutations. When the device is started, the current difficulty level is displayed with the help of LEDs. Information about it is stored in the non-volatile memory of the microcontroller.

On fig. a schematic diagram of the device is presented. The "+" SB0 and "-" SB1 buttons are used to change the difficulty level. Button "Start" SB2 serves to start the process of the game. Buttons "Pos.1" SB3, "Pos.2" SB4, "Pos.3" SB5 are designed to select the position of the desired LED at the end of the permutation cycle. Button "Reset" SB6 resets the microcontroller. "Pole 1-Pole 7" LEDs HL1-HL7 make up the playing field, where HL1-HL3 is the middle row, HL4-HL5 is the top row, HL6-HL7 is the bottom row. LEDs "Yes" HL8 and "No" HL9 serve to indicate the correctness of the player's answer.

(click to enlarge)

The gameplay looks like this:

The LEDs of this row, and their permutation begins. The position of the desired LED (ball) changes. The direction of the permutations is random. To do this, the algorithm of the microcontroller program uses a linear congruent method for obtaining a pseudo-random number [1]. At the end of such manipulations, the player needs to select the position in which the marked LED is located by pressing the Pos1-Pos3 buttons. If the answer is correct, the green "Yes" LED lights up. In case of an incorrect answer, the red LED "No" lights up, and the field of the true position of the ball flashes.

The device uses an ATTINY 2313 microcontroller [2]. The fuses are configured to work from an internal RC oscillator with a frequency of 8 MHz (CKSEL3-0 equal to 0100). To increase the reliability of working with EEPROM data, a BOD detector is used at a voltage level of 4.3 volts. To enable it, you must assign a value of 100 to the BODLEVEL 2-0 fuses. It is also necessary to disable clock division by 8 (CKDIV8 is 1).

On fig. 2 shows a photograph of the device assembled on a breadboard.

Electronic game LED thimbles on the microcontroller. Breadboard device

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Literature

1. Wikipedia, ru.wikipedia.org/wiki/Linear_congruent_method 2. ATTINY2313 Datasheet

Author: Anton Garkusha, gam-rainers@mail.ru; Publication: cxem.net

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