采用矩阵式的并入串出的程序来检测系统中开关的状态，可以检测到到到上百个开关的状态，只需三个IO口-With matrix-style string into a program to detect the system state of the switch, can detect the state of the switch to the hundreds, only three IO port

这是一个基于51单片机的4*4点阵显示程序，开发语言c-This is based on the microcontroller 51 4* 4 dot matrix display program, development of language c++

矩阵键盘程序，自己编写的，可以作为初学者使用-Matrix keyboard program, I have written, you can use as a beginner