用51单片机为核心 为步进电机测速 将磁钢粘在步进电机齿轮上 切割霍尔元件 霍尔元件管脚脉冲输入单片机 用定时器计两个脉冲间隔可以实现测速功能-Microcontroller core with 51 for the stepper motor speed will stick to the magnet stepper motor gear on the Hall element cutting pulse input pin Hall element chip with a pulse interval timer can be achieved for two speed function