Dimmer_ESP32.ino

#define PWM_PIN 23
#define Z_C_PIN 22

int DimmerValue = 100;

hw_timer_t *timer = NULL;

void DimmerSetup() {
  pinMode(PWM_PIN, OUTPUT); 
  pinMode(Z_C_PIN, INPUT);
  
  attachInterrupt(Z_C_PIN, [](){
    if (DimmerValue > 5) {
      timerAlarmWrite(timer, DimmerValue * 100, true);
      timerAlarmEnable(timer);
      timerStart(timer);
    } else {
      digitalWrite(PWM_PIN, HIGH);
    }
  }, RISING);

  timer = timerBegin(3, 80, true);
  timerAttachInterrupt(timer, [](){
    digitalWrite(PWM_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(PWM_PIN, LOW);
    timerStop(timer);
  }, true);
}

void setup() {
  DimmerSetup();
}

void loop()  {
  DimmerValue = (DimmerValue == 0) ? 100 : DimmerValue - 1;
  delay(10);
}