Finally, the software side, the main program, keyboard scanning subroutine, the pwm signal process, tachometer subroutine and display routines to write ideas, as well as specific procedures for implementation.

Finally, in terms of software, the main program, scan the sub-program, PWM signal detection program, sub-program and the preparation of the sub-program as well as specific program ideas.

Finally in the software aspect, introduced the master routine, the keyboard scanning subroutine, the PWM signal has the procedure, measures the fast subroutine and the demonstration subroutine compilation mentality as well as the concrete procedure realization.

Finally in terms of software, describes the main program, the keyboard scan subroutines, PWM signal generator program, speed measurement and display writing ideas and specific program of the subroutine.

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