const int ledPin = 2; // PWM生成后实际输出引脚
//设置PWM参数
const int freq = 4000;//PWM频率
const int ledChannel = 0;//信号生成GPIO
const int resolution = 12;//12位分辨率，by Jason. 可设置1~14bits
void setup(){
//PWM参数设置
ledcSetup(ledChannel, freq, resolution);
//将生成信号通道绑定到输出通道上
ledcAttachPin(ledPin, ledChannel);
}
void loop(){
//逐渐变亮，12位分辨率因而到4096
for(int dutyCycle = 0; dutyCycle <= 123;dutyCycle++){
// changing the LED brightness withPWM
ledcWrite(ledChannel, dutyCycle);
delay(20);
}
//逐渐变暗
for(int dutyCycle = 123; dutyCycle >= 0;dutyCycle--){
// changing the LED brightness with PWM
ledcWrite(ledChannel,dutyCycle);
delay(20);
}
}
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