使用pic16单片机按需要产生pwm输出信号，包括电路图和代码,Pic16 by the need for the use of single-chip pwm output signal generated, including circuit diagrams and code

单片机产生PWM波对电机进行调速 脉冲宽度调制(Pulse Width Modulation—PWM)是指将输出信号的基本周期固定，通过调整基本周期内工作周期的大小来控制输出功率-Single-chip PWM wave generated on the motor speed Pulse width modulation (Pulse Width Modulation-PWM) refers to the basic cycle of the output signal of a fi

51系列单片机无PWM输出功能，可以采用定时器配合软件的方法输出。对精度要求不高的场合，非常实用。电路图见图一，采用了高速光隔（6N137）输出，并将PWM的信号倒相。-51 series no PWM output, the timer can be used with the software, the method output. On occasions, less precision, very practical. Circuit shown in Figure 1, using h