16个按键分为数字键和功能键。用来向单片机输入点菜信息，单片机通过键盘扫描得到按键信息，调出对应信息，然后通过LCD显示出来。-16 number keys and function keys are divided into key. Ordering information for input to the MCU, microcontroller scans the keyboard get key information, transfer the corresponding information, and then through the LCD display.