Slot machine on RS triggers. Scheme, description

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Slot machine on RS triggers. Radio - for beginners

Radio - for beginners

It contains four series-connected RS-flip-flops (Fig. 1, a), assembled on the 2I-NOT logic elements of two K155LAZ microcircuits, LED indicators HL1 and HL2, a push-button switch SBl and four pairs of closing contacts, indicated in the diagram as switches SA1- SA4. The player's task is to light the HL2 "Finish" LED as quickly as possible by successively closing the contacts SA1, SA2, etc. But to do this, as you will see later, is not so simple.

The machine works like this. While the contacts of the SBl "Start" button are closed, all triggers are in the zero state, since their input R is a low voltage level; indicators do not light up.

Slot machine on RS triggers

Fig.1 Slot machine on RS triggers

Note that the voltage at the input R of the first flip-flop is zero. Opening the contacts of the start button turns on the HL1 LED, since the VD1SB1 shunt circuit opens. This signals the start of the game. But the flip-flops continue to maintain the zero state, since now at the input R of the first flip-flop, the voltage, although it has increased, remains less than the threshold.

Sequential short-term closure of contacts SA1-SA4 leads to switching to a single state of the first trigger (while the HL1 LED goes out), and then the rest. Simultaneously with the switching of the last trigger to a single state, when a low-level voltage appears at its inverse output, the HL2 LED flashes, notifying that the task has been completed correctly.

Cancellation of the states of the automaton triggers, which they take when the start button is pressed and the task is correctly performed, can be traced from the table in Fig. 1, b. When the start button is released and its contacts close again, the triggers switch to the zero state, the HL2 LED goes out.

Most parts of the gaming machine can be mounted on the board as shown in Fig. 2, a, c.

Slot machine on RS triggers

Rice. 2 Installation of the slot machine

Start button SB1 with return by pressing again. Suitable, for example, a push-button switch used in table lamps, or a two-position toggle switch. The design of contacts SA1 - SA4 depends on the game in which you will use the machine. If this is a game with the conditional name "roll the ball", then the contacts can be metal plates attached to the cover under four holes in it (Fig. 3, b). The box itself is round, with a diameter of 2 ... 200 mm with a side so that the ball does not jump out of it.

Holding the box in his hands and shaking it from side to side, the player must roll a metal ball with a diameter of 15-20 mm into the holes in the sequence indicated on the lid (this is the playing field) by arrows. Getting into the hole, the ball closes the contacts and thereby sends an impulse to the input of the corresponding trigger.

The electronic "stuffing" together with the power supply (3336 battery) must be placed inside the box so that the SB1 trigger button is accessible and the LEDs are visible. Do not forget to also provide a switch in the battery circuit.

Two such devices, launched by a common button on the remote control panel, will allow two players to compete in the skill of rolling the ball in a given sequence.

Another example of a possible use of a slot machine is for high-speed "shooting" at four targets with tennis balls. Each target is a suspended tin plate with a diameter of 60 ... 80 mm, isolated from the second such plate located behind it. When the ball hits exactly, the plates shortly close and the corresponding trigger switches to a single state. The team that hits all the targets in a certain sequence with the least number of balls thrown wins.

You can, of course, come up with other possible applications of the automaton on RS-flip-flops.

The RS flip-flop, which we hope you have figured out, switches from one stable state to another, i.e. opposite to the previous one, immediately after changing the signal levels at its input. Such triggers are called asynchronous with set inputs. However, in instruments and devices of digital technology, synchronous triggers with extended action logic, such as D-flip-flops, are more often used.

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