直流电机、步进电机、舵机的完全驱动。直接GPIO口控制，PWM脉冲信号由TIMER产生。

舞台换色器的控制程序。包括DMX512信号接收，光栅检测位移、控制直流电机加速、减速等功能。-The stage for color control program. Including DMX512 signal receiving, grating displacement detection, control of DC motor acceleration, deceleration and other functions.

atmega8 输出八路PWM信号，控制直流电机、舵机，语言为C。 -atmega8 eight PWM output signal to control the DC motor, servo, language is C.

stm32 要注意参考信号要求有1.6V的直流电平，可采用分压的方法得到，具体电路见图1。对于信号单端输入方式， REFCLKB管脚接电源或地；对于差分输入方式，输入端信号可以是方波或正弦波，直流电平大约为1.6V，峰峰值大于0.4V。-Frequency Analyser,Nothing is difficult,if you put your heart into it.

无源蜂鸣器内部不带震荡源，所以如果用直流信号无法令其鸣叫，必须用2K~5K的方波去驱动它。在树莓派上实现无源蜂鸣器的鸣响(The passive buzzer does not have a shock source inside, so if the signal can not be called with a DC signal, it is necessary to drive it with the square wave of 2K~5K. The sounding of a pas