LED电子显示屏和控制器的控制程序。显示屏通过按键切换显示数字和字母，显示屏能显示4组特定数字或者英文字母组成的句子，通过按键切换显示内容，本例为整屏四个字一起显示的程序。-Button to toggle through the display of numbers and letters, the display can show four groups composed of specific numbers or letters of sentences, by switching th