DIY Pong - Part 4 of 4 - The Play

This is the final part of my four-part DIY Pong blog.
We now have all the ingredients in place to wrap this up. We have bats and a ball. Let's play ball.

Single Player Mode
To make things simple, let's begin with a single player game. We detect when the ball hits the paddle by ANDing the ball position with the paddle position. The output of the AND gate is stretched by a monostable multivibrator to about 1ms. The ball direction is switched by toggling the square wave generator at U9A.

Collision between the ball and left paddle triggers a positive going pulse at U13A, pin-6. Diode D1 is forward biased and pulls the non-inverting input of U9A above the reference voltage at the inverting input. This switches the direction of the ramp.

Collision between the ball and the right paddle triggers a negative going pulse at U13B, pin-9. Diode D2 is forward biased and pulls the non-inverting input of U9A below the reference voltage. This switches the ball motion to the opposite direction.

Ball rebound circuit
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Single Player Demo

Breadboard Circuit
The complete circuit is now on the breadboard.
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Two Player Demo


It has been a lot of fun putting this together in a matter of a few evenings over one week. I hope you enjoyed seeing the progress as much as I have in putting it all together.

Thanks for watching!

DIY Pong - Part 1 of 4 - Getting Started
DIY Pong - Part 2 of 4 - The Paddles
DIY Pong - Part 3 of 4 - The Ball

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