| We design a kind of direct current motor system.. AT89C51 is the control central of this system and we can control the rotary speed of motor and working time via keyboards. The rotary speed and setting time can be displayed with eight LEDs. In the system, AT89C51 modulates the angle of flow of silicon controlled rectifier, and then , the voltage of armature is controlled. In this way, we adjust rotary speed of motor.
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