C语言写的，测试7279按键功能，51单片机上通过运行-Written in C language to test the function keys 7279, 51 by running the single-chip

7279和TLC549数字电压表，由51单片机控制的，通过模数TL549采样制作的电压表，同时由7279控制的数码管显示-7279, and TLC549 digital voltage meter, controlled by the microcontroller 51 through the production of modulus TL549 sampling voltmeter, accompanied by a 7279-controlled LED display