PWM方式控制发光二极管的亮度

说明： 按钮控制PWM输出，使P4.1的发光二极管（数码管的b段），由亮到灭分为8级控制，一个

按钮增加亮度，另外一个减少亮度,数码管显示亮度等级,P1.0 控制变亮，P1.1控制变暗. -

PWM mode control the brightness of the light emitting diode

Descr iption: button control PWM output, make P4.1 led (light emitting diode digital tube b section), by the light to destroy is divided into eight level control, a

Button to increase brightness, another to reduce brightness, digital tube display brightness level, P1.0 control light, P1.1 dimming control.