利用AVR单片机的定时器1分别从PB1（OC1A）和PB2（OC1B）两引脚输出PWM波形。为了演示PWM的功率调节功能，我们在PB1和PB2引脚分别接了发光二极管，用10K电位器模块从PC0引脚接入0- 5V电压。程序中，主循环内不断采集ADC端口0（PC0引脚）的电压值，根据变化改变OCR1A和OCR1B两个输出比较寄存器的值。PB1和PB2引脚上的PWM波形也随之发生改变，从而调节了送给发光二极管的电压，控制发光二极管的明暗。实验时，调节电位器的电阻值改变电压，会看到两个发光二极管明暗变化，但变化的方向相反，即一个越来越亮，一个越来越暗，反过来一样。这是因为OC1A和OC1B两个引脚输出的波形不一样，一个是升序计数，一个降序计数，连个波形是相互取反的

Timer1_pwm.docx

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