Abstract
A method of minimum resolution adjustment based on the control of PWM is proposed. In the first part, the principle of PIC16F877 is analyzed and the signal period and the pulse width is calculated. the Two buttons on PIC16F877 are used to precise control the increment and decrement of output of PWM. The procedure of control of PWM is introduced at the last part. Using the method, the speed of rotation of the direct current motor can be precise controlled.
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