Title the controlled frequency trigger base on the pwm technology and aim to realize
——The Hardware Design
Abstract
Along with the development of the electronic information industry, Adjustable frequency triggers an increasingly important role in scientific research and practical applications. The traditional frequency flip-flop is usually a lot of logical circuit and the sequential circuits to fulfill.This circuit, general slowdown, And the measurement frequency range is relatively small. Taking into account the above-mentioned problems, This paper based on the design of PWM technology digital frequency trigger. It can produce square wave and triangle wave. And the frequency of the waveform and occupies emptiescompared available program control change. In the single and peripheral devices matrix keyboard, Through the keyboard control of the increase and decrease of the waveform and frequency wave of choice, And the LCD display shows the frequency size and duty cycle, Set frequency and duty cycle can also be directly through the PC. In this paper, the principle of frequency trigger. Introduces the design of microcontroller-based digital frequency trigger.Chosen to implement the system have a variety of circuit components Complete physical and cuit testing it.
Keywords P89LPC936 microcontroller pwm Frequency meter LM8053 LCD monitor
