用c语言编写的4*4键盘输入检测。用AT89C51单片机做控制芯片，程序用keil编写，实验仿真有protel99se实现，已验证成功，该文件中有源程序和仿真文件。 -With the c language of 4* 4 keyboard input detection. To do with the AT89C51 microcontroller control chip, the program using keil write, experimental simulation

有一个4×4的键盘，按下一个键，LED上显示相应的键值（0～F），并且喇叭响一声-A 44 keyboard, press a key on the LED display the corresponding key (0 to F), and the horn sounds