Transistorle triyak surmek

int AC_LOAD = 11;    // Output to Opto Triac pin

int dimming = 128;  // Dimming level (0-128)  0 = ON, 128 = OFF

/* Due to timing problems, the use of ‘0’ can sometimes make the circuit

flicker. It is safer to use a value slightly higher than ‘0’



*/

int i=0;



void setup()

{

  //Serial.begin(115200);

  pinMode(AC_LOAD, OUTPUT);// Set AC Load pin as output

  attachInterrupt(0, zero_crosss_int, RISING);

// Chooses '0' as interrupt for the zero-crossing

}

// the interrupt function must take no parameters and return nothing

void zero_crosss_int()

// function to be fired at the zero crossing to dim the light

{

  // Firing angle calculation : 1 full 50Hz wave =1/50=20ms

  // Every zerocrossing thus: (50Hz)-> 10ms (1/2 Cycle) For 60Hz => 8.33ms



  // 10ms=10000us

  // (10000us - 10us) / 128 = 75 (Approx) For 60Hz =>65

  int dimtime = (75*dimming);    // For 60Hz =>65 

  //Serial.println(dimtime); 

  delayMicroseconds(dimtime);    // Off cycle

  digitalWrite(AC_LOAD, HIGH);   // triac firing

  delayMicroseconds(10);         // triac On propogation delay

                                 //(for 60Hz use 8.33)

  digitalWrite(AC_LOAD, LOW);    // triac Off

}

void loop()  {

for (i=0; i <= 128; i+=1)

{

dimming=i;

delay(40);

}

  for (i=128; i >=0; i-=1)

{

dimming=i;

delay(40);

}

}