51单片机 蜂鸣器演奏音乐，C语言，在proteus中仿真（生日快乐、同一首歌、两只蝴蝶、挥着翅膀的女孩）-51 single-chip buzzer to play music, C language, the simulation in proteus (happy birthday, the same song, two butterflies, waving wings girls)