PWM LED

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#define LED_PIN 12
void setup() {
  // put your setup code here, to run once:
    pinMode(LED_PIN,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i=0;i<256;i++) {
    analogWrite(LED_PIN,i);
    delay(10);
  }
  for(int i=255;i>=0;i--) {
    analogWrite(LED_PIN,i);
    delay(10);
  }
}

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#define LED_PIN 12
#define freq 2000
#define channel 0
#define resolution 8 //分辨率

void setup() {
  // put your setup code here, to run once:
    //pinMode(LED_PIN,OUTPUT);
    ledcSetup(channel,freq,resolution);
    ledcAttachPin(LED_PIN,channel);
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i=0;i<pow(2,resolution);i++) {
    ledcWrite(channel,i);
    delay(10);
  }
  for(int i=pow(2,resolution)-1;i>=0;i--) {
    ledcWrite(channel,i);
    delay(10);
  }
}