pebble game

This circuit is based ,on the well known video game "Break Out" where the idea is to shoot down as many bricks as possible in as few attempts as possible . In the version described here the bricks are represented by six LEDs. Initially the reset key must be depressed for the six "pebbles" to Iight up. The device is then activated with the "LOAD" key whereupon the green LED (D1) will light up. If a point is scored with the "FIRE" button, the pebble that was hit disappears and the corresponding LED goes out. Scoring a hit is pure coincidence and the system will have to be reloaded after each shot. There are two methods of playing the game. Either each player has to hit all the pebbles and the winner will be the one to do this in the least number of shots, or the players fire shots alternately and he who hits the last pebble wins. The operation of the circuit is quite straightforward. The shift register (ICl) is reset by switch S3. All the outputs will then be low and the six pebble ...