Slot machine Reaction. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Slot machine "Reaction" is designed to determine the reaction of a person. Unlike the machine "Who is faster?" one person can participate in the "Reaction" slot machine. The subject must release the previously pressed button for each ignition of the light bulb. The machine is made on five integrated circuits of the K155 series.
(click to enlarge)
On elements D1.2, D1.4, a pulse generator with a frequency of approximately 1 Hz is made. The pulses are sent to the inverter D3.1, the output of which is connected through a resistor R4 to the LED V1. At the same time, the signal from the generator and inverter D3.1 is fed to the input of the coincidence circuit made on the elements D2.1 and D2.3. The enabling signal from the button S1 also comes here through the circuit that eliminates the bounce of the button on the elements D1.1 and D1.2. When a single pulse from the button coincides with the moment of ignition of the LED V1, the element D2.3 is set to the zero state and, through the inverter D2.4, acts on the counter D4, changing its state by one.
The state of the D4 counter in binary code is decoded into a decimal code by a demultiplexer on the DS chip, and the V2-V17 LEDs indicate the number of valid button signals. If the button is released before or after the LED lights up, element D2.1 will work, which will reset the counter to zero, and the game will have to start over.
The frequency of LED flashes can be changed within a small range by resistor R2.
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