PWM generation for TRIAC control through an optocoupler with PIC16F877A

[john120]

Hello,there can you please help me to generate a pwm signal for controlling a TRIAC which deals with bulb light control and use its duty cycle as the value of Potentiometer connected to the analog input .

please help see the codes and poteus circuits.

#include<16f877a.h>
#device ADC = 10         // Need to tell compiler ADC is configured for 10-bit reading
#fuses HS,NOWDT
#use delay(clock=12000000)
#include<stdio.h>
#include<STDLIB.H>
#use standard_io(A)
#use standard_io(B)
#use standard_io(D)
#define PORTB
#DEFINE PORTC
#define PORTA
//byte const digit[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};

//char display[3];
int value;
//unsigned long volt;
//unsigned int value2;

void main(){
   set_tris_A(0xFF);
   set_tris_B(0X00);
   set_tris_D(0x00);
   output_b(0);
   output_d(0);

   setup_comparator(NC_NC_NC_NC);
   setup_adc(ADC_CLOCK_INTERNAL);
   setup_adc_ports(AN0);
   set_adc_channel(0);
   setup_vref(FALSE);

   setup_ccp1(CCP_PWM);       
   setup_timer_2(T2_DIV_BY_1, 25, 1); 
    set_pwm1_duty(volt);



   while(TRUE)
{
      delay_us(100);
      //value=read_adc(); //Not required
      read_adc(ADC_START_ONLY);
      delay_us(100);
      value=read_adc(ADC_READ_ONLY);

      volt=(value*5)/1023; 
      

   }
}

,the circuit is here

Please help.

 

[FvM]

Triac must use phase angle control rather than PWM, variable delay with respect to mains voltage zero crossing. There are pretty much hard- and software examples at edaboard

 

[john120]

can you please guide me on how controlling the triac using that technique you are saying?

I am using PIC16F877A

Thanks.

 

[Jestin_cubetech]

can you please guide me on how controlling the triac using that technique you are saying?

I am using PIC16F877A

Thanks.

https://www.edaboard.com/threads/265546/

 

[john120]

https://www.edaboard.com/threads/265546/

I want just a help on coding in ccs c ,the pic is using a variable resistors on its analog input,can this be useful for the project?

Me I want to use this resistors for changing the luminosity of the lamp.

Thanks