8键电子琴课程设计，c语言源程序+protues电路仿真+报告-8-key keyboard curriculum design the c language source+protues in circuit simulation+ report

AT89C51单片机丁字路口交通灯课程设计，C语言源代码，含中断救护车蜂鸣器模块，并附有课程设计报告-AT89C51 single T-junction traffic lights curriculum design, C language source code, including interrupt ambulance buzzer module, together with curriculum design report