当激光琴弦被阻挡时，光敏电阻将检测到并反馈至单片机，单片机通过检测对应的拐角，利用蜂鸣器发出相应的音符。(When the laser string is blocked, the photosensitive resistor will be detected and fed back to the microcontroller, the microcontroller through the detection of the corresponding corner, using the