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Two channel relay control - need some help

 
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Renovatio



Joined: 17 Dec 2016
Posts: 2

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Two channel relay control - need some help
PostPosted: Sat Dec 17, 2016 12:10 pm     Reply with quote
Hi guys, I'm trying to do two channel relay control with two pics (16F88) and I wrote the codes. I used Rs232. It worked on Proteus but it's not working in real life. I mean for example I'm pressing the first button in transmitter but receiver is answering too late or never answering. I tried to close transmit when not in use but I couldn't. I think my transmitter working like jammer. So I don't know what I should to do right now. Can you help me guys? By the way; sorry for my english.

Here is the transmitter codes:
Code:

#include <16F88.h>
#FUSES NOWDT,PUT,XT,EC_IO,NOMCLR,NOBROWNOUT,NOLVP,CPD,WRT
#use delay(clock=4000000)
#use rs232 (baud=1200,xmit=pin_b5, rcv=pin_b2)

#byte TXSTA = getenv("sfr=TXSTA")
#bit TXEN = TXSTA.5


void main()
{

          while(true)
                {
               
                     port_b_pullups(TRUE); 
 
                  if (!input_state(pin_B0))
                       
                       {
                          TXEN=1;
                          putc(0b01010101);
                          putc(0b01010101);
                          putc(0b01010101);
                          putc('X');
                          putc('A');
                          putc('X');
                          putc('A');
                          putc('X');
                          putc('A');
   
                          while(!input(pin_B0));
                       }
                       
                   if (!input_state(pin_B1))
                       {
                          TXEN=1;
                          putc(0b01010101);
                          putc(0b01010101);
                          putc(0b01010101);
                          putc('X');
                          putc('B');
                          putc('X');
                          putc('B');
                          putc('X');
                          putc('B');
                                         
                          while(!input(pin_B1));
                       }   
                       
                       if ((input_state(pin_B0)) && (input_state(pin_B1)))
                            {                   
                                       TXEN=0;
                            }
                }
               
}

And receiver codes:
Code:

#include <16F88.h>
#FUSES NOWDT,PUT,XT,NOMCLR,NOBROWNOUT,NOLVP,CPD,PROTECT
#use delay(clock=4000000)
#use rs232 (baud=1200,xmit=pin_b5, rcv=pin_b2 )

int32 yenibilgisay=0;
byte islemyapildi=0,kesmegeldi=0;

char gelen;
int sayacx=0;

#int_rda    //rs232 kesmesi
void haberlesme()
{
   disable_interrupts(int_rda);     
   gelen = getch();
   kesmegeldi=1;
   clear_interrupt(int_rda);
   yenibilgisay=0;
}


void main()
{
   
   set_tris_a(0x00);
   output_a(0x00);
   kesmegeldi=0;
   enable_interrupts(int_rda);
   enable_interrupts(GLOBAL);
   
  while(1)
   {
   if  ((kesmegeldi)==1)
      {
           delay_ms(1);
           if  ((gelen)=='X') sayacx=sayacx+1;
           
                 if  ((sayacx)>=1)
                         {
                                if ((islemyapildi)==0)
                                         {
                                                if (gelen == 'A')
                                                     {
                                                          output_toggle(pin_a2);
                                                         islemyapildi=1;
                                                      }
                     
                                               if (gelen == 'B')
                                                      {
                                                             output_toggle(pin_a3);
                                                             islemyapildi=1;
                                                      }   
                                          }
                         }             
                 kesmegeldi=0;
                 enable_interrupts (int_rda);
                 enable_interrupts(GLOBAL);
            }
                       
 
          if ((islemyapildi)==1) yenibilgisay=yenibilgisay+1;

          if (yenibilgisay>250)
             {
                islemyapildi=0;
                yenibilgisay=0;                   
                sayacx=0;
             }
   }
  }

Proteus:
[img] https://postimg.org/image/3pb55mya1/ [/img]

Thanks.
Ttelmah



Joined: 11 Mar 2010
Posts: 19505

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PostPosted: Sat Dec 17, 2016 1:22 pm     Reply with quote
Lets step through siome things to start with.

RS232 'idles' driven. The line has to stay high.
Why on earth are you turning off the RS232?. Depending on what is in the output latch this can result in the slave 'seeing' a break. Not what is wanted. Also the characters will still be sending for a couple of mSec after the putc, so switching the UART off, may well result in 'partial' characters being sent.....

Your master chip may not even be running. You have two oscillator fuses set. Proteus doesn't understand fuses, and will 'believe' the chip is clocked even if it isn't. Always start by getting a set of fuses, and prove your chip is actually working by doing a simple 'flash an LED' output using these fuses.

Don't use protection on a chip, until you have your code working. Doing so, means that a full erase of every location in the chip has to be done to change even a single byte. Uses up chip flash memory 'lives' pointlessly.

Look at ex_sisr.c. Don't fiddle around disabling the receive interrupt in the receive device. Doing this means characters could be missed.

Because characters could be missed, you _must_ have 'ERRORS' in your RS232 setup. This adds code to 'unlock' the UART if it gets hung because characters have been missed, Proteus doesn't understand that this will happen to the UART.

As you can see in two ways straight away, Proteus will mislead you about what a real chip will do. It is a complete waste of time, telling you that things 'can work', when they won't. Start with the master chip and get this working without Proteus. Get it sending data at the correct rate. Then once this is working, start on the second chip.
Renovatio



Joined: 17 Dec 2016
Posts: 2

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PostPosted: Sat Dec 17, 2016 4:57 pm     Reply with quote
Ttelmah, at first thank you for your time. As you can see I'm begginer and I want to learn, and improve myself. I have an interest in rf devices and it's my first try. I did what you said and it worked very well. Nobody answered me but you did. Thanks again Smile
temtronic



Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario

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PostPosted: Sun Dec 18, 2016 10:11 am     Reply with quote
If you're interested in RF modems look into the HC-12 devices. SIMPLE to use, cheap to buy, and they work !
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