Crossing game. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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The algorithm of the game is based on an old logical problem about a wolf, a goat and a cabbage, which the carrier must transport to the other side of the river in a two-seater boat so that a wolf with a goat or a goat with cabbage does not remain on the shore at the same time.
The scheme of the device that implements the conditions of the game is shown in the figure.
(click to enlarge)
The device consists of a logical node made on a D1 chip (K155LA4), switching elements SI-S5, an audio signaling unit on a D2 chip (K155LAZ) and a V3 transistor (MP38). The device is powered by a 3336L battery and consumes current up to_50.mA. The situation at the crossing is set by the position of the switches S1...S4. From the output of the switches, when the S6 button is pressed, the "logical 0" level is applied to the inputs of the logic node microcircuits D1.1, D1.2, D2.1, D2.2. The logical node generates an error signal when a dangerous situation occurs (a wolf and a goat or a goat and a cabbage on the shore). In this case, a "logical 1" signal appears at the output of element D2 or D0 and one of the LEDs lights up, signaling a dangerous situation. At the same time, the "logic 1" level is applied to the enable input of the sound signal generator, which can be turned off by switch S5.
The signal from the output of the generator, assembled according to the multivibrator circuit, is fed through the power amplifier V3 to the dynamic head B1. The volume level is controlled by resistor R6. Switch S6 can be used to exclude the consumption of energy from the source during the thinking of moves. Before the start of the game, the switches S1-S4 must be in the position corresponding to the situation when the wolf, cabbage, goat and carrier are on the same bank of the river.
On the front panel of the device, a river is drawn, in which the switches "Carrier", "Goat", "Wolf", "Cabbage" are installed in a row. LEDs are installed on the opposite banks, which, when lit, indicate on which of the banks an emergency situation has developed. In the corner of the panel there is a "Crossing" button and a toggle switch to turn off the sound alarm.
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