乒乓球比赛计分器 1．设计一个由甲、乙双方参赛，有裁判的3人乒乓球游戏机。

2．用8个(或更多个)LED排成一条直线，以中点为界，两边各代表参赛双方的位置，其中一只点亮的LED指示球的当前位置，点亮的LED依此从左到右，或从右到左，其移动的速度应能调节。调

3.当“球”(点亮的那只LED)运动到某方的最后一位时，参赛者应能果断地按下位于自己一方的按钮开关，即表示启动球拍击球。若击中，则球向相反方向移动；若未击中，则对方得1分。

4.一方得分时，电路自动响铃3 s，这期间发球无效，等铃声停止后方能继续比赛。

5.设置自动记分电路，甲、乙双方各用2位数码管进行记分显示，每计满21分为1局。

6.甲、乙双方各设一个发光二极管，表示拥有发球权，每隔5次自动交换发球

-1 the design of a by a, B both teams, 3 table tennis game with the referee.



2 by 8 (or more) LED to form a straight line, the midpoint is bounded on both sides by, represented the position, current position one lit LED indicating the ball, light LED and from left to right, or from right to left, the moving speed can be adjusted. Adjustable



3 when the "ball" (the LED light) to a final position, participants should be resolutely press button switch located on their own side, that start hitting. If hit, the ball to move in the opposite direction　if not hit 1 points, then the other party.



The 4 one scores, circuit automatic bell 3 s, during which the service is invalid, and the bell stopped ringing rear can continue to play the game.



5 set up automatic scoring circuit, a, B both sides with 2 digital tube display per meter with 21 points, divided into 1 bureau.



6 A, B both parties are each provided with a light emitting diode, with the right to serve, every 5 time automatic