A/D转换器控制电动机的转速和方向，8字数码管显示当前的转速值，也即A/D电压值，LED点阵显示速度等级和旋转方向。-A/D converter to control the motor speed and direction, 8 character LED display the current speed value, the A/D voltage, LED dot matrix display and rotation speed rating.

用STM32的AD读取外部模拟输入,可以连在光敏组和热敏电阻上,熟悉了解AD和DMA的正确配置 ,现象： 当有电压改变时，数码管显示当前的电压值-AD with the STM32 read external analog inputs can be connected to the photosensitive group and thermistor, become familiar with the correct configuration of AD and DMA , Phe