Cytron Technical Forum

Hi, im using pic16f877a to connect with 315mhz Rx & Tx..can anyone help me by giving a simple coding to test this rf module when swicth(RB0) at Tx is pressed, LED(RB0) at Rx is blink..here i post my coding which is not work and i don't where is the mistake. Can anyone correct it. Thankz
TX

CODE: SELECT_ALL_CODE

#include <htc.h>
#include "usart.h"
#include "delay.h"

__CONFIG(0x3F72);

unsigned char Data = 0;

void main()
{
   TRISB = 0x01;
   PORTB = 0x00;
   init_comms();
   Data = 0b10101010;
   while(1)
   {
      if(RB0 == 1)
      {
         putch(Data);
         RB1 = 1;
         DelayMs(200);
      }
   }
}

RX

CODE: SELECT_ALL_CODE

#include <htc.h>
#include "usart.h"
#include "delay.h"

__CONFIG(0x3F72);

unsigned char Data = 0;

void main()
{
   TRISB = 0x00;
   PORTB = 0x00;
   init_comms();

   while(1)
   {
      Data = getch();
      DelayMs(200);
      if(Data == 0b10101010)
      {
         RB0 = 1;
      }
   }
}

Would you mind to show your schematics for TX and RX here?

Rx and Tx schematic

What is the baud rate? what is the crystal value?

The circuit looks weird to me. Is there any power to microcontroller? If so why is 5V battery there?

You must delete DelayMs(200); and putch(Data); continuously. Also use baudrate 1200.

can you edit back my source code for tx and rx...because i dont know where should at the baudrate 1200

my crystal value is 20Mhz...power supply for microcontroller is 5v as per schematic

geevan WROTE:can you edit back my source code for tx and rx...because i dont know where should at the baudrate 1200

For learning, you must do it yourself. Not my job to write a code for you.

ok thanks...atleast can u tell me where sholud at the baudrate 1200

at least?