Dual Direction Digital Ping-Pong by 555 Timer

Figure 1 

The circuit was designed to create a game of ping-pong with a double direction of flashing lights.

• Ping Pong – a sport that represents another term for table tennis in which two or four players are hitting a hollow, lightweight back and forth using rackets or paddles, where the game takes place on a hard table divided by the net
• 555 – a highly stable device for generating oscillation or accurate time delays used in pulse width/position modulation, sequential timing, time delay generation, linear ramp generator, precision timing, and pulse generation due to its features such as normally open and normally off output, temperature stability, output and supply TTL compatible, adjustable duty cycle, and operates in both astable and monostable mode
• 7400 – a quadruple 2-input NAND gate employing Transistor-Transistor Logic (TTL) to achieve high speed at moderate power dissipation and provide the basic functions used in the implementation of digital integrated circuit systems due to its low output impedance, minimal variation in switching times with temperature, high noise immunity, and good capacitive drive capability
• 74193 – a synchronous up/down 4-bit (0-15) counter with outputs that change precisely together on each clock pulse where the count increases as the up clock input becomes high and the count decreases as the down clock input becomes high but the count resets to zero when the reset input is high

Along the straight line of LED arrangement is a little dot that moves up and down during the operation of the circuit. When the light reaches the LED D16, the condition will change and will cause a change in the direction and movement of the light. When the circuit is provided with power, the movement of the light seems to be running in circles along the LED line. The IC1 555 operates in unstable flip flop mode as it supplies stable frequency pulses in which the frequency can be altered by the use of 1M Ohms trimmer TR1. This will be the basis for adjusting the velocity of the LED’s light as it goes up and down. Since the 555 operates as bistable, the output is set to the low state when one input is triggered and it will be set to the high state when another input is triggered.

Since IC3 is a 4-bit up/down counter, it is being supplied with the frequency that comes from the IC1 via the two gates A & B of IC2 that functions as an RS flip flop. The simplest possible memory element and fundamental latch is the RS flip flop, represented by parts C & D of IC2, which is made by feeding the outputs of two NOR gates back to the other NOR gates input. The Reset and Set inputs were referred to the inputs R and S. Their gates were arranged to maintain a stable output even after the inputs are turned off. In this circuit, it is responsible for changing the state of the light as it travels and reaches the edge LEDs D1 and D16.

IC4 is being supplied by the output counter that serves as the driver of the LEDs. The change of state will also be subdued under the limitation of electronics. The effect of the LED lights is proportional to the various results.

Figure 2 

Nowadays, the digital ping pong can be seen being played in the modern Nintendo Wii by using electronic paddles or racquets along with the other types of physical games made to be played digitally in video consoles. They provide enjoyment, fun, and gaming knowledge to people of all ages.

Source:users.otenet.gr/~athsam/digital_ping_pong_2.htm