说明：  以单片机为核心，设计一个LED广告点阵灯牌； 按开始键，LED显示屏实现广告内容的滚动显示，按停止键结束显示。； 按暂停键，LED显示屏广告内容暂停滚动，按方向键实现左右方向滚动。
(With single chip computer as the core, a LED ad dot matrix lamp is designed. Press the start key, the LED display realizes the rolling display of the content of the advertisement, and ends the display by the stop key. ; Press the pause key, and the content of the LED display ads suspends and rolls in the left and right direction by the direction key.)