用灯和按键实现打乒乓球的功能。灯亮到右极限位置，则及时按下右边键可使亮向左边点亮。否则记失败分，用数码管显示分数-With lights and buttons to play table tennis. Lights to the right limit position, press the right key in a timely manner to enable bright lights to the left. Otherwise credited failure points, digital display scores