说明：  仪器仪表中普遍使用的LED键盘显示人机交互技术做了分析． 给出一种由智能型LED 键盘显示芯片HD7279A 构成的人机交互电路。该电路具有接口简单、外围元件少，体积小．功能强的特点，使用该器件可简化仪器仪 表中人机界面交互电路的设计。
(Commonly used instrument in the keyboard LED display human-computer interaction techniques are analyzed. Presents a Smart LED keyboard from the display chip HD7279A circuit composed of human-computer interaction. The circuit has a simple and less external components, small size. Features strong functions, the use of the device simplifies the instrumentation in the human computer interface circuit.)