Along with our country’s industry and agricultural fast development, and people living raises continuously, furthermore, keep on the society development incessancy, the need of automation equipments enlarges continuously, the direct current motor control is the key part of the automatic control. This design according to the PIC single chip to control direct current motor, and control motor ‘s revolve to right/left and fast/ slowly, output the signal of PWM to drive the motor from the PIC which also realize the left revolve and right revolve to lock with each other. This design introduced direct current electrical motor structure, characteristics, category and the magnetism create mode etcs; The advantage, structure characteristics, instruction characteristics etc. of the PIC single chip .The system introduced PIC16F73 single chip, going into detail internal structure ,exterior leads, function modules, registers structure, function, address...etc. of PIC126F73 single chip, in addition view introduce assemble langue.
The design of the hardware electric circuit, the especially important is a high low voltage to insulate and lock with each other of the electrical engineering’s direction. Adopt photo-transistor optically coupled to gallium arsenide infrared emitting diode device to insulation in here, for insure the operation safety, adopt dual lock with each other.
Keywords: DC engineering ；PIC single chip ；PWM
