可以实现16张病床的同时呼叫，呼叫后蜂鸣器响，由两位数码管显示呼叫房号，且按病房呼叫先后顺序显示呼叫病房号，由4*4矩阵键盘代替呼叫按键，另有4*4矩阵应答按键，按下相应病房房号的应答按键后，数码管将不再显示相应病房号，无病房呼叫后蜂鸣器停止响声----------里边有仿真和程序，已调试成功（在其他大佬处获得修改后所得，请勿用于商业，谢谢）(It can call 16 beds at the same time, buzzer rings after calling, two digital tubes display the call room number, and call the ward number in order according to the ward call, by 4 * 4 matrix keyboard instead of the call button, and 4 * 4 matrix response button, press the corresponding ward number response button, the digital tube will no longer show the phase The buzzer stops ringing when the ward number is called. There are simulation and program in it. It has been debugged successfully.)