[SOLVED] AC Dimmer Using TRIAC

[Mohamad Syazwan]

Can someone help me with the code
I already have the hardware and code it with arduino
but i want to try it using pic16 using mikroC or mikrobasic
can someone help me regarding the code
this is my schematic diagram that i'm using


this is the arduino code

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Code C - [expand]
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int AC_LOAD = 3;    // Output to Opto Triac pin
int dimming = 128;  // Dimming level (0-128)  0 = ON, 128 = OFF
 
void setup()
{
  pinMode(AC_LOAD, OUTPUT);// Set AC Load pin as output
  attachInterrupt(0, zero_crosss_int, RISING);  // Choose the zero cross interrupt # from the table above
}
 
//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 (10.000/120)
  // 10ms=10000us
  // (10000us - 10us) / 128 = 75 (Approx) For 60Hz =>65
 
  int dimtime = (75*dimming);    // For 60Hz =>65    
  delayMicroseconds(dimtime);    // Wait till firing the TRIAC
  digitalWrite(AC_LOAD, HIGH);   // Fire the TRIAC
  delayMicroseconds(10);         // triac On propogation delay (for 60Hz use 8.33)
  digitalWrite(AC_LOAD, LOW);    // No longer trigger the TRIAC (the next zero crossing will swith it off) TRIAC
}
 
void loop()  {
  for (int i=5; i <= 128; i++){
    dimming=i;
    delay(10);
   }
}

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[eriksen]

Maybe you could say something about whats happenining when you run the code?

 

[D.A.(Tony)Stewart]

Does the hardware work ok with signal tests?

 

[Vinayram91]

LED Bulb Dimming with Triac

I had designed the dimming circuit with TRIAC.By changning conduction angle of triac using PWM signal,I can change the luminance of bulb.That means dimming.I have used the snubber circuit also to prevent the damage of the triac from the instant transcient of power supply.


I am using the dimmable bulb as a AC Load for dimming test of my circuit.I can able to dim my bulb.But sometimes I am getting flickering in the bulb.

So,I tried to capture the input power supply.I realized that is because of power supply.

Is there any other way to control the power supply with smoothing manner to get non-flickering effect while I am dimming the bulb. ?