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16F628A RX TX wirelessly

 
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nuno12345



Joined: 16 Jul 2008
Posts: 50

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16F628A RX TX wirelessly
PostPosted: Wed Jul 16, 2008 7:23 pm     Reply with quote
Hi all, I got a WRL-07816 from sparkfun.

Now I'm trying to communicate wirelessly with the TX and RX.

My problem is:
I can communicate with the two, but I've to use a POT in the receiver and it has to be adjusted precisely, otherwise it wont work.

The receiver is always getting something (I know it has noise) but what can I do to make it work? The way I'm doing probably it will work here in the protoboard (I'm using one PIC to both transmit and receive) but when I get another PIC and use one to transmit and another one to receive probably it wont work, because the signal will get weaker as the distance increases, I thought that when I get my new PIC (16f88) I could use read_adc to get the voltage, this way it will work as a precise POT, but the signal strength still resides..


My code:
Code:
#include <16F628A.h>
#use delay (clock=4000000)
#fuses INTRC_IO, NOWDT, NOPUT, NOBROWNOUT, NOMCLR, NOLVP, NOPROTECT

void transmit()
{
   output_high(PIN_A0);
   delay_ms(100);
   output_low(PIN_A0);
   delay_ms(100);
}

void receive()
{
      if (input(PIN_A1) == 1)
      {
         output_high(PIN_B0);
      }
      else
      {
         output_low(PIN_B0);
      }
      delay_ms(100);
}
void main()
{
   while (true)
   {
      transmit();
      receive();
   }
}



Anyone?

Thanks



EDIT:

I forgot to mention that I have my receiver connected to PIN_A1 and transmitter to PIN_A0
arunb



Joined: 08 Sep 2003
Posts: 492
Location: India

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RE:
PostPosted: Wed Jul 16, 2008 10:56 pm     Reply with quote
You need to configure the UART on the mcu using the #uses rs232 directive.

Ex:

#use rs232(baud=4800,xmit=pin_b2, rcv=pin_b1,parity=n,bits=8)

thanks
arunb
nuno12345



Joined: 16 Jul 2008
Posts: 50

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PostPosted: Thu Jul 17, 2008 8:31 am     Reply with quote
Can you give me some code I can work with please?
nuno12345



Joined: 16 Jul 2008
Posts: 50

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PostPosted: Thu Jul 17, 2008 6:44 pm     Reply with quote
Ok, I looked at other examples and made this code:

Code:
#include <16F628A.h>

//-------------------------------------------------------------------------------
#define WireTX PIN_B2 // <--------- C 6
#define WireRX PIN_B1
//-------------------------------------------------------------------------------

#use delay (clock=4000000)
#fuses INTRC_IO, NOWDT, NOPUT, NOBROWNOUT, NOMCLR, NOLVP, NOPROTECT

#use rs232(baud=2400,xmit=WireTX , rcv=WireRX ,ERRORS , STREAM=COM_A )


unsigned int8 data;
int1 flag=0;

#int_rda
void rd_isr(void)               
{
   disable_interrupts(INT_RDA);           // Disable Serial Recieve Interrupt
   disable_interrupts(GLOBAL);            // Disable Global Interrupts

   data= fgetc(COM_A);

   if(data=='T')
   {
      flag=1;
   }

   enable_interrupts(GLOBAL);
   enable_interrupts(INT_RDA);
}

void transmit()
{
   if(input(PIN_A0)==0)  //if button pressed
   {
      delay_ms(20);
      fputc('T',COM_A);
      delay_ms(20);
                   
      delay_ms(200);         //delay some ms
   }
}

void receive()
{
   if(flag==1)
   {
      output_high(PIN_A1);
      delay_ms(1000);
      output_low(PIN_A1);
      flag=0;
   }   
}



void main()
{
   enable_interrupts(global);
   enable_interrupts(int_rda);

   while(1)
   {
      transmit();

      receive();
        }
}


Thing is, my LED flashes randomly, but when I connect PIN_A0 to GND nothing happens, or it keeps flashing randomly, and when I connect PIN_A0 to VCC the LED shuts off..
nuno12345



Joined: 16 Jul 2008
Posts: 50

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PostPosted: Thu Jul 17, 2008 10:37 pm     Reply with quote
Got it to work thanks to the following thread

Code:
Code:
#include <16F628A.h>

#define WireTX PIN_B2
#define WireRX PIN_B1

#use delay (clock=4000000)
#fuses INTRC_IO, NOWDT, NOPUT, NOBROWNOUT, NOMCLR, NOLVP, NOPROTECT

#use rs232(baud=1200,xmit=WireTX , rcv=WireRX)

unsigned int data;

#INT_RDA
rda_isr()
{
   data = getc();
}

void main()
{
   enable_interrupts(INT_RDA);
   enable_interrupts(GLOBAL);
   
   while(true)
   {
      if (input(PIN_A0) == 0)
      {
         putc('1');                         //Repeat data out
         output_high(WireTX);
         delay_ms(300);
         putc('2');                       //Repeat data out
         output_low(WireTX);
         delay_ms(300);
      }
     
      if(data == '1')
      {
         output_high(PIN_A1);
         delay_ms(100);
         output_low(PIN_A1);
      }
      else if(data == '2');
      {
         output_high(PIN_A1);
         delay_ms(100);
         output_low(PIN_A1);
      }

   }
}
nuno12345



Joined: 16 Jul 2008
Posts: 50

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PostPosted: Fri Jul 18, 2008 5:02 am     Reply with quote
Actually its not working, if I disconnect my TX and RX the LED still does the same thing :/
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