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Need help with AC 60Hz Dimmer ( timer0 interrupt )

 
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freesat



Joined: 08 Feb 2011
Posts: 32

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Need help with AC 60Hz Dimmer ( timer0 interrupt )
PostPosted: Wed Sep 21, 2011 4:20 pm     Reply with quote
Hi guys...

I want some help with ac 60hz dimmer, my goal is to build a custom dmx smoke machine with temperature control (also I will build incandescent lamp dimmer array too ), is almost done! but i have trouble with ac dimmer.

steps...

Processor:
PIC12F628 running at 4Mhz internal, using zero cross detector on ext_int pin.

dmx512:
Done (works fine without use delay on ext_int! Especial thanks to "Mark" for sample receive routine).

Temperature control: Done (works and need improve delays with scope, but delay freezes rda interrupt causing data lost).

Wind control:
Done (Works fine! dc pwm with mosfet)

Motor control:
Done (works fine! solid state relay with mosfet)

I think the problem is delay to fire triac on ext_int is too high and no left cycles to process rda_int, and if i right, use a timer0 and wait right moment to fire triac.

Any suggestions? I will appreciate any help.

best regards
Sebastiao Rocha


my sample code...
Code:

#define triac PIN_B3

#define channel_temperature 0
#define channel_fan         1
#define channel_motor       2

int8 dmx_channel[3]; /* Smooke machine with 3 channels ( temperature, fan, motor ) */

#int_EXT
void  EXT_isr(void) { 
   int16 wait_dutty_time; 
         
   output_low( triac );
     
   /* Calculated delay time ( us / max_dutty * dutty ) */   
   wait_dutty_time = (int16) (16575/255) * ( dmx_channel[channel_temperature] ^ 255 );   
   delay_us( wait_dutty_time );
   
   /* dont fire triac if dutty is zero, remember... dutty is inverted "xor with 255" */   
   if ( wait_dutty_time < 16510 ) { output_high( triac ); }
}

void main( void ) {
   dmx_channel[channel_temperature] = 127 /* set dutty to 50%, for test only */
   
   enable_interrupts( INT_EXT );
   ext_int_edge( H_TO_L );
         
   enable_interrupts(GLOBAL);     
   while ( 1 ) {}
}

I think code using timer0 like this will work... this im need help.
Code:

enable_interrupts(INT_TIMER0);
setup_timer_0(RTCC_INTERNAL | RTCC_DIV_1 | RTCC_8_BIT );
set_timer0(?);

int16 wait_dutty_time = 16510; 

#int_EXT
void  EXT_isr(void) {             
   output_low( triac );
         
   /* Calculated delay time ( us / max_dutty * dutty ) */   
   wait_dutty_time = (int16) (16575/255) * ( dmx_channel[channel_temperature] ^ 255 );   
}

#int_TIMER0
void TIMER0_isr(void) {
  if ( wait_dutty_time >0 ) { wait_dutty_time--; }
 
  /* time to fire triac */
   if ( wait_dutty_time == 0 ) { output_high( triac ); }   
   
   /* time to disable triac */
   if ( wait_dutty_time == 16510 ) { output_low( triac ); }      
}
freesat



Joined: 08 Feb 2011
Posts: 32

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change the code... now its works better, but need adjusts.
PostPosted: Thu Sep 22, 2011 1:59 am     Reply with quote
I rebuild the code and it is more stable, but have some noise and is not 100% adjusted with waveform, need more adjusts, any help will be appreciated.

Note: I changed to 12F675 only for tests with ac.

Code:

#include <12F675.h>

#fuses INTRC, NOMCLR
#use delay(clock=4M, oscilator=4M, int=4M )
#zero_ram

int8 triac_dutty = 0;

#int_EXT
void EXT_isr( void ) { 
  set_timer0( triac_dutty );
 
  if ( triac_dutty < 255 ) { output_low( PIN_A5 ); }   
}

#int_TIMER0
void TIMER0_isr( void ) {     
  set_timer0( 0 ); 
  delay_us(100);
  if ( triac_dutty >0 ) { output_high( PIN_A5 ); }
}

void main( void ) {
  setup_timer_0( T0_INTERNAL| T0_DIV_64 | T0_8_BIT );
 
  ext_int_edge(H_TO_L);   
  enable_interrupts( INT_EXT );
 
  set_timer0( 0 );
  enable_interrupts( INT_TIMER0 );
 
 
  enable_interrupts( GLOBAL );

  while ( 1 ) {   
    set_adc_channel(2);
    delay_us(10);
    triac_dutty = read_adc();
  }
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Sep 22, 2011 1:44 pm     Reply with quote
This is not real code. It doesn't compile. The compiler gives these errors:
Quote:

*** Error 100 "pcm_test.c" Line 4(5,45): USE parameter value is out of range Unknown option: OSCILATOR
*** Error 12 "pcm_test.c" Line 19(11,12): Undefined identifier -- delay_us
*** Error 12 "pcm_test.c" Line 37(13,14): Undefined identifier -- delay_us

You have misspelled "oscillator" (for CCS), which makes the compiler
not accept the #use delay() statement, so it won't allow delay_us().

You don't need to have all 3 parameters in the #use delay() statement.
Since you have INTRC, that tells the compiler you want the internal
oscillator. In this case, you only need to put in a "clock=4M" parameter.
Also, if you want to use the oscillator pins for i/o, you should specify
the INTRC_IO fuse. Example:
Code:

#include <12F675.h>
#fuses INTRC_IO, NOMCLR
#use delay(clock=4M )
 



Also you never call the setup_adc_ports() function. You're trying to use
AN2 as an analog pin, but it's still in digital mode. That's not correct.
Add this line near the start of main():
Code:

setup_adc_ports(sAN2);
freesat



Joined: 08 Feb 2011
Posts: 32

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Only triac fire on incorrect time on waveform
PostPosted: Thu Sep 22, 2011 5:29 pm     Reply with quote
Hi PCM Programer, thanks for reply...

in fact i dont put full code, but it compile and run ok, all interrupts are working as spected and also adc read too, triac fire on incorrect time on waveform, i dont have a scope to check this.

i put this line
Code:
#use delay(clock=4M, oscilator=4M, int=4M )
because i have some calculations like this and only putting int=4M doenst work. is not misspell and with me works fine ( i build on old version, 4.114, but i will downlaod and install an update )
Code:
SPBRG=(((getenv("CLOCK")/250000)/16)-1);


will be nice, if getenv can get values from ( oscilator and int ) too. i use getenv a lot, because code is more smart and i can switch PIC Model at any time without modify code.

this is all code im trying now. ( note: Serial routines removed, because this PIC doenst have USART )
Code:

#include <12F675.h>

#device adc=8;

#fuses INTRC_IO, NOMCLR, NOPROTECT, BROWNOUT, NOPUT
#use delay( clock=4M, oscilator=4M, int=4M )
#use fast_io(A)
#zero_ram

#define PORT_zero  PIN_A2
#define PORT_adc   PIN_A4
#define PORT_triac PIN_A5


int8 triac_dutty = 0;

#int_EXT
void EXT_isr( void ) { 
  set_timer0( triac_dutty );
 
  if ( triac_dutty < 255 ) { output_low( PORT_triac ); }   
}

#int_TIMER0
void TIMER0_isr( void ) {     
  set_timer0( 0 ); 
 
  delay_us(600);
  if ( triac_dutty >0 ) { output_high( PORT_triac ); }
}

void main( void ) {
  int8 tmp;
 
  set_tris_a( 0b011111 );   
  setup_comparator(NC_NC_NC_NC);
  setup_adc_ports(sAN3);
  setup_adc(ADC_CLOCK_INTERNAL );

  setup_timer_0( T0_INTERNAL| T0_DIV_64 | T0_8_BIT );
 
  ext_int_edge(H_TO_L);   
  enable_interrupts( INT_EXT );
 
  set_timer0( 0 );
  enable_interrupts( INT_TIMER0 );
 
 
  enable_interrupts( GLOBAL );

  while ( 1 ) {
    set_adc_channel(3);
    delay_us(15);
    tmp = read_adc();
    if ( tmp != triac_dutty ) { triac_dutty = tmp; }
  }
}


edit: correcting type error.
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