const int LED_PINS[] = {32,33,25,26,27,14,12,13};
const int NUM_LEDS   = sizeof(LED_PINS)/sizeof(int);

#define OFF (LOW)
#define ON (HIGH)

const int PWM_RESOLUTION = 8;
const int PWM_FREQ = 1000;
const int DUTY_MAX = (1 << PWM_RESOLUTION);

void setup() {
  for (int i=0; i < NUM_LEDS; i++) {
    ledcSetup( i /*channel*/, PWM_FREQ, PWM_RESOLUTION );
    ledcAttachPin( LED_PINS[i] /*pin*/, i /*channel*/ );
  }
}

void loop() {
  static uint16_t value_1=0;
  static uint16_t value_2=1;
  static uint16_t value_3=2;
  static uint16_t value_4=3;
  // put your main code here, to run repeatedly:
  for ( int i=0; i < NUM_LEDS; i++ ) {
    if (i == value_1){
      ledcWrite(i, (DUTY_MAX-1)*10/100);
    }else if (i == value_2) {
      ledcWrite(i, (DUTY_MAX-1)*25/100);
    }else if (i == value_3) {
      ledcWrite(i, (DUTY_MAX-1)*50/100);
    }else if (i == value_4) {
      ledcWrite(i, DUTY_MAX-1);
    }else {ledcWrite(i, 0);}
  }
  value_1 = (value_1+1) % NUM_LEDS;
  value_2 = (value_2+1) % NUM_LEDS;
  value_3 = (value_3+1) % NUM_LEDS;
  value_4 = (value_4+1) % NUM_LEDS;
  delay(500);
}