[SOLVED] Pic18f452 based relay flasher

[easy electronics]

Hi Everyone.

i am facing a high noise problem in a relay flasher circuit.
here is circuit diagram and pcb image of shift register pcb for relay


Main code

#include <18f452.h>
#device ADC=10
#FUSES HS,NOWDT, NOBROWNOUT, NOLVP
#use delay(crystal=4000000)
#use rs232(baud=9600,xmit=pin_c6,rcv=pin_c7)

/*
#byte    porta=0x05  // porta ram address
#byte    portb=0x06
#byte    portc=0x07
#byte    portd=0x08
#byte    porte=0x09
 */
#byte    porta=0xf80  // porta ram address
#byte    portb=0xf81
#byte    portc=0xf82
#byte    portd=0xf83
#byte    porte=0xf84


   #bit    clock=PORTd.0
   #bit    latch=PORTd.1
   #bit     data=PORTd.2

#include "flash patt.c"
#include "fountain driver.c"
void test();
int16 process_analog(char i);
int16 var=0;
int16 delay=0;
int t=0;
///////////////////////////////////////////////////////////////////////////////
void main ()
{
setup_adc_ports(ALL_ANALOG);
setup_Adc(adc_clock_internal);

set_tris_d(0x00);
portd=0;
printf("start");
//test();
while(1)
{
for(char i=0;i<6;i++)
{
send_data(i);send_data(i);send_data(i);send_data(i);send_data(i);send_data(i);send_data(i);send_data(i);
t=process_analog(0);printf("\n\r%u"t);
delay=t/25; delay=delay*1000;printf("\n\rdelay%Lu"delay);
printf("\n\rI=%u"i);
delay_ms(delay);
output_toggle(pin_b7);
}
}
}
///////////////////////////////////////////////////////////////////////////////
void test()
{
while(1)
{
write595(0xffff);
write595(0xffff);
write595(0xffff);latch=1;delay_ms(10);latch=0;
delay_ms(1000);
write595(0x0000);
write595(0x0000);
write595(0x0000);latch=1;delay_ms(10);latch=0;
delay_ms(1000);}
}
/////////function//////////////
int16 process_analog(char i)
{
int32 X;
set_adc_channel(i);
delay_us(100);
 x= read_adc();
 x=x*90/1023;
 x+=30;
return x;
}

/////////////////////////////////////////////////
void send_data(int i);
void  write595(int16 i);
int16 long_convert(int16 i);
////////////////////////////////////////////////////
void send_data(int i)
{
delay_ms(10);
      write595(pat[i][0]);
      write595(pat[i][1]);
      write595(pat[i][2]);
      latch=1;
      delay_ms(50);
      latch=0;
}
//////////
void  write595(int16 i)
{
i=long_convert(i);
data=bit_test(i,15);delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,14);delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,13);delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,12);delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,11);delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,10);delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,9); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,8); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,7); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,6); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,5); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,4); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,3); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,2); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,1); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
data=bit_test(i,0); delay_us(100);clock=1;delay_us(200);clock=0;delay_us(200);
}
///////////////////////////////////////////////////////////////////////
int16 long_convert(int16 i)
{
int16 temp=0;
#bit  bit0=temp.0
#bit  bit1=temp.1
#bit  bit2=temp.2
#bit  bit3=temp.3
#bit  bit4=temp.4
#bit  bit5=temp.5
#bit  bit6=temp.6
#bit  bit7=temp.7
#bit  bit8=temp.8
#bit  bit9=temp.9
#bit  bit10=temp.10
#bit  bit11=temp.11
#bit  bit12=temp.12
#bit  bit13=temp.13
#bit  bit14=temp.14
#bit  bit15=temp.15

bit0  =bit_test(i,7);
bit1  =bit_test(i,6);
bit2  =bit_test(i,5);
bit3  =bit_test(i,4);
bit4  =bit_test(i,3);
bit5  =bit_test(i,2);
bit6  =bit_test(i,1);
bit7  =bit_test(i,0);
bit8  =bit_test(i,15);
bit9  =bit_test(i,14);
bit10 =bit_test(i,13);
bit11 =bit_test(i,12);
bit12 =bit_test(i,11);
bit13 =bit_test(i,10);
bit14 =bit_test(i,9);
bit15 =bit_test(i,8);
return temp;
}

here are patterns for re

 const int16 pat[135][3] =
//                      F       8          F       8          F       8        
                  {   
                      0b0000000000000000,0b0000000000000000,0b0000000000000000,//0  loop1
                      0b0000000000000000,0b0000000000000000,0b0000000000000001,//1
                      0b0000000000000000,0b0000000000000000,0b0000000000000011,//2
                      0b0000000000000000,0b0000000000000000,0b0000000000000101,//3
                      0b0000000000000000,0b0000000000000000,0b0000000000001001,//4
                      0b0000000000000000,0b0000000000000000,0b0000000000010001,//5
                      0b0000000000000000,0b0000000000000000,0b0000000000100001,//6
                      0b0000000000000000,0b0000000000000000,0b0000000001000001,//7
                      0b0000000000000000,0b0000000000000000,0b0000000010000001,//8
                      0b0000000000000000,0b0000000000000000,0b0000000100000001,//9
                      0b0000000000000000,0b0000000000000000,0b0000001000000001,//10
                      0b0000000000000000,0b0000000000000000,0b0000010000000001,//11
                      0b0000000000000000,0b0000000000000000,0b0000100000000001,//12
                      0b0000000000000000,0b0000000000000000,0b0001000000000001,//13
                      0b0000000000000000,0b0000000000000000,0b0010000000000001,//14
                      0b0000000000000000,0b0000000000000000,0b0100000000000001,//15

                      0b0000000000000000,0b0000000000000000,0b0000000000000111,//16  loop2
                      0b0000000000000000,0b0000000000000000,0b0000000000011001,//17
                      0b0000000000000000,0b0000000000000000,0b0000000001100001,//18
                      0b0000000000000000,0b0000000000000000,0b0000000110000001,//19
                      0b0000000000000000,0b0000000000000000,0b0000011000000001,//20
                      0b0000000000000000,0b0000000000000000,0b0001100000000001,//21
                      0b0000000000000000,0b0000000000000000,0b0110000000000001,//22
                      0b0000000000000000,0b0000000000000000,0b0000000000000001,//23
                      0b0000000000000000,0b0000000000000000,0b0111111111111111,//24
                      0b0000000000000000,0b0000000000000000,0b0000000000000001,//25
                      0b0000000000000000,0b0000000000000000,0b0111111111111111,//26

                      0b0000000000000000,0b0000000000000000,0b1000000000000000,//27  loop3
                      0b0000000000000000,0b0000000000000001,0b1000000000000000,//28
                      0b0000000000000000,0b0000000000000010,0b1000000000000000,//29
                      0b0000000000000000,0b0000000000000100,0b1000000000000000,//30
                      0b0000000000000000,0b0000000000001000,0b1000000000000000,//31
                      0b0000000000000000,0b0000000000010000,0b1000000000000000,//32 
                      0b0000000000000000,0b0000000000100000,0b1000000000000000,//33 
                      0b0000000000000000,0b0000000001000000,0b1000000000000000,//34 
                      0b0000000000000000,0b0000000010000000,0b1000000000000000,//35 
                      0b0000000000000000,0b0000000100000000,0b1000000000000000,//36 
                      0b0000000000000000,0b0000001000000000,0b1000000000000000,//37 
                      0b0000000000000000,0b0000010000000000,0b1000000000000000,//38 
                      0b0000000000000000,0b0000100000000000,0b1000000000000000,//39 
                      0b0000000000000000,0b0000000000000011,0b1000000000000000,//40 
                      0b0000000000000000,0b0000000000001100,0b1000000000000000,//41 
                      0b0000000000000000,0b0000000000110000,0b1000000000000000,//42 
                      0b0000000000000000,0b0000000011000000,0b1000000000000000,//43 
                      0b0000000000000000,0b0000001100000000,0b1000000000000000,//44 
                      0b0000000000000000,0b0000110000000000,0b1000000000000000,//45 
                      0b0000000000000000,0b0000000000000000,0b1000000000000000,//46 
                      0b0000000000000000,0b0000111111111111,0b1000000000000000,//47 
                      0b0000000000000000,0b0000000000000000,0b1000000000000000,//48  
                      0b0000000000000000,0b0000111111111111,0b1000000000000000,//49 
                      
                      0b0000000000000000,0b0001000000000000,0b0000000000000000,//50    loop4
                      0b0000000000000000,0b0011000000000000,0b0000000000000000,//51 
                      0b0000000000000000,0b0101000000000000,0b0000000000000000,//52 
                      0b0000000000000000,0b1001000000000000,0b0000000000000000,//53 
                      0b0000000000000001,0b0001000000000000,0b0000000000000000,//54 
                      0b0000000000000010,0b0001000000000000,0b0000000000000000,//55 
                      0b0000000000000100,0b0001000000000000,0b0000000000000000,//56 
                      0b0000000000001000,0b0001000000000000,0b0000000000000000,//57 
                      0b0000000000010000,0b0001000000000000,0b0000000000000000,//58 
                      0b0000000000100000,0b0001000000000000,0b0000000000000000,//59 
                      0b0000000001000000,0b0001000000000000,0b0000000000000000,//60 
                      0b0000000000000000,0b0111000000000000,0b0000000000000000,//61 
                      0b0000000000000001,0b1001000000000000,0b0000000000000000,//62 
                      0b0000000000000110,0b0001000000000000,0b0000000000000000,//63 
                      0b0000000000011000,0b0001000000000000,0b0000000000000000,//64 
                      0b0000000001100000,0b0001000000000000,0b0000000000000000,//65 
                      0b0000000000000000,0b0001000000000000,0b0000000000000000,//66 
                      0b0000000001111111,0b1111000000000000,0b0000000000000000,//67 
                      0b0000000000000000,0b0001000000000000,0b0000000000000000,//68
                      0b0000000001111111,0b1111000000000000,0b0000000000000000,//69
                      
                      0b0000000000000000,0b0000000000000000,0b0000000000000000,//70  complete off
                      0b0000000000000000,0b0000000000000000,0b0000000000000000,//71  complete off
                      
                      0b0000000000000000,0b0001000000000000,0b1000000000000001,//72  loop5
                      0b0000000000000000,0b0001000000000000,0b1000000000000011,//73
                      0b0000000000000000,0b0001000000000000,0b1000000000000101,//74
                      0b0000000000000000,0b0001000000000000,0b1000000000001001,//75
                      0b0000000000000000,0b0001000000000000,0b1000000000010001,//76
                      0b0000000000000000,0b0001000000000000,0b1000000000100001,//77
                      0b0000000000000000,0b0001000000000000,0b1000000001000001,//78
                      0b0000000000000000,0b0001000000000000,0b1000000010000001,//79
                      0b0000000000000000,0b0001000000000000,0b1000000100000001,//80
                      0b0000000000000000,0b0001000000000000,0b1000001000000001,//81
                      0b0000000000000000,0b0001000000000000,0b1000010000000001,//82
                      0b0000000000000000,0b0001000000000000,0b1000100000000001,//83
                      0b0000000000000000,0b0001000000000000,0b1001000000000001,//84
                      0b0000000000000000,0b0001000000000000,0b1010000000000001,//85
                      0b0000000000000000,0b0001000000000000,0b1100000000000001,//86
                      0b0000000000000000,0b0001000000000001,0b1000000000000001,//87
                      0b0000000000000000,0b0001000000000010,0b1000000000000001,//88
                      0b0000000000000000,0b0001000000000100,0b1000000000000001,//89
                      0b0000000000000000,0b0001000000001000,0b1000000000000001,//90
                      0b0000000000000000,0b0001000000010000,0b1000000000000001,//91
                      0b0000000000000000,0b0001000000100000,0b1000000000000001,//92
                      0b0000000000000000,0b0001000001000000,0b1000000000000001,//93
                      0b0000000000000000,0b0001000010000000,0b1000000000000001,//94
                      0b0000000000000000,0b0001000100000000,0b1000000000000001,//95
                      0b0000000000000000,0b0001001000000000,0b1000000000000001,//96
                      0b0000000000000000,0b0001010000000000,0b1000000000000001,//97
                      0b0000000000000000,0b0001100000000000,0b1000000000000001,//98
                      0b0000000000000000,0b0011000000000000,0b1000000000000001,//99
                      0b0000000000000000,0b0101000000000000,0b1000000000000001,//100
                      0b0000000000000000,0b1001000000000000,0b1000000000000001,//101
                      0b0000000000000001,0b0001000000000000,0b1000000000000001,//102
                      0b0000000000000010,0b0001000000000000,0b1000000000000001,//103
                      0b0000000000000100,0b0001000000000000,0b1000000000000001,//104
                      0b0000000000001000,0b0001000000000000,0b1000000000000001,//105
                      0b0000000000010000,0b0001000000000000,0b1000000000000001,//106
                      0b0000000000100000,0b0001000000000000,0b1000000000000001,//107
                      0b0000000001000000,0b0001000000000000,0b1000000000000001,//108
                      0b0000000000000000,0b0001000000000000,0b1000000000000111,//109
                      0b0000000000000000,0b0001000000000000,0b1000000000011001,//110
                      0b0000000000000000,0b0001000000000000,0b1000000001100001,//111
                      0b0000000000000000,0b0001000000000000,0b1000000110000001,//112
                      0b0000000000000000,0b0001000000000000,0b1000011000000001,//113
                      0b0000000000000000,0b0001000000000000,0b1001100000000001,//114
                      0b0000000000000000,0b0001000000000000,0b1110000000000001,//115
                      0b0000000000000000,0b0001000000000011,0b1000000000000001,//116
                      0b0000000000000000,0b0001000000001100,0b1000000000000001,//117
                      0b0000000000000000,0b0001000000110000,0b1000000000000001,//118
                      0b0000000000000000,0b0001000011000000,0b1000000000000001,//119
                      0b0000000000000000,0b0001001100000000,0b1000000000000001,//120
                      0b0000000000000000,0b0001110000000000,0b1000000000000001,//121
                      0b0000000000000000,0b0111000000000000,0b1000000000000001,//122
                      0b0000000000000001,0b1001000000000000,0b1000000000000001,//123
                      0b0000000000000110,0b0001000000000000,0b1000000000000001,//124
                      0b0000000000011000,0b0001000000000000,0b1000000000000001,//125
                      0b0000000001100000,0b0001000000000000,0b1000000000000001,//126
                      
                      0b0000000001111111,0b1111111111111111,0b1111111111111111,//127  loop6  all flash
                      0b0000000000000000,0b0001000000000000,0b1000000000000001,//128
                      0b0000000001111111,0b1111111111111111,0b1111111111111111,//129
                      0b0000000000000000,0b0001000000000000,0b1000000000000001,//130
                      0b0000000001111111,0b1111111111111111,0b1111111111111111,//131
                      0b0000000000000000,0b0001000000000000,0b1000000000000001,//132
                      0b0000000000000000,0b0000000000000000,0b0000000000000000,//133                                                                                 
                      };

without load all of things works normal.
when i connect any load to output of relays the 74ls595 miss behaves.
it takes noise from any where .

The microcontroller 18f452 works normal either load is connected or not.


My question is "how to remove prevent 74ls595 from noise ".

load voltage is 220vac
load current is 0.5amp for each relay.

 

[abdberkana]

Increase your input capcitance

 

[Aussie Susan]

All of the traditional techniques could be applied which include:
- make sure the PSU has the capacity to handle the peak load
- lots of bypass capacitors
- make sure the PCB layout separates the high voltage/current switched lines from the signal lines
- make sure the PCB layout includes ground planes to shield the signal lines
- etc.
Susan

 

[easy electronics]

I have analysed the problem and found the reason of annoying behave .
Spark is generated on relay points When 220 loads are connected and relays turns on .
Spark generate noise in data lines of 74hc595 so it laugh on me :laugh: .

i have tried to send same data 5 times and it is working with 10% error ( some time few relays turns on while 1st and 2nd try of data writing then 3rd , 4th and 5th try makes everything as required ).

I have tried to increase pulse width but it behaves same as noisy.
I have tried to increase data line current by adding resistors at the end of data line (pull up's and pull down) but :blah: :blah: :blah: :blah: :blah: :blah: :blah:

 

[Aussie Susan]

There are a number of ways you can try to suppress the arc across the relay contacts - try googling "relay arc suppression" for any number of ideas. However remember that they all work on the 'contact' side of the relay which generally means the high voltage/current side so BE CAREFUL.
Once the noise gets into the rest of the circuit, I have already suggested things to do to try to cope with it, but stopping it in the first place is the way to go.
Susan

 

[easy electronics]

I have changed this design with Triac .
problem is solved .

Thank you every one for guiding me.

 

[badea]

Its good idea to use Triac instead of Relay, triac more accurate but maybe hard driving consideration