/* 
    Este sketch serve para controlar um ventilador/motor AC em modo PSM (Pulse Skip Modulation)
    Deve ser usado com um modulo Dimmer AC, como por exemplo este; https://pt.aliexpress.com/item/1005001965951718.html
    O pino de interrupção (D2) deve ser ligado ao pino Z-C do modulo
    O pino de saída (D12) deve ser ligado ao pino PSM do modulo
    A entrada analógica (A0) pode ser ligada a um potenciometro ou a uma saída analogica de outro microcontrolador
    
    This sketch is used to control an AC fan/motor in PSM mode (Pulse Skip Modulation)
    Should be used with an AC Dimmer module, such as this one; https://pt.aliexpress.com/item/1005001965951718.html
    The interrupt pin (D2) must be connected to the Z-C pin of the module
    The output pin (D12) must be connected to the PSM pin of the module
    The analog input (A0) can be connected to a potentiometer or to an analog output of another microcontroller
*/




#define led 13
#define fan 12                                            // Ventilador (Fan)
#define pot A0                                            // Potenciometro (Potentiometer)

int potValue = 0;
int mapedPotValue = 0; 
int fanOnTime = 0;           
int fanOffTime = 0;
int freq_Hz = 50;                                         // Frequencia da rede AC (AC mains frequency)
                                                          // In some regions you will have to switch to 60 Hz



void fanUpdate(){
  static int countOn = 0;
  static int countOff = 0;

  if(fanOnTime > countOn){
    digitalWrite(fan,1);                                   // Liga o Ventilador (Fan ON)
    digitalWrite(led,1); 
    countOn++;
  }
  else if(fanOnTime <= countOn && fanOffTime > countOff){
    digitalWrite(fan,0);                                   // Desliga o Ventilador (Fan OFF)  
    digitalWrite(led,0);
    countOff++ ;
  }
  else{
    countOn = 0;
    countOff = 0;
  }
}

void fanSetVal(int percentg, int freq, int* pr_fanOnTime, int* pr_fanOffTime){

  int zeroCrossPuls = freq*2;
  int percentgVal = (zeroCrossPuls*percentg)/100;

  *pr_fanOnTime = percentgVal;                         
  *pr_fanOffTime = zeroCrossPuls - percentgVal;
}



void setup() {
  // put your setup code here, to run once:

  //analogReference(EXTERNAL);                                // descomentar se quiser utilizar uma voltagem de referencia diferente, por ex. saida analogica de 3,3v de outro microcontrolador
                                                              // uncomment if you want to use a different reference voltage, e.g. 3.3v analog output from another microcontroller 
  
  attachInterrupt(digitalPinToInterrupt(2),fanUpdate,RISING );

}

void loop() {
  // put your main code here, to run repeatedly:

  potValue = analogRead(pot);
  mapedPotValue = map(potValue,0,1023,0,100);                // Transforma o valor analogico em percentagem (Transforms the analog value into a percentage)

  fanSetVal(mapedPotValue, freq_Hz, &fanOnTime, &fanOffTime);

}