problem with sending data using RF module

[rano_zen06]

Hello everyone,
I have a problem with sending data using my RF module, I don't know what the problem is.I try to change the baud rate but nothing happens.Actually I want to send a character using my RF module.But before I accomplish that, I want to test my RF module whether it's function or not.So I use this simple program to test it but my LCD at the receiver board display nothing. I don't know how to troubleshoot the problem because I'm new to this thing.Please help me guys.
Here is the code and the schematic of my hardware.

Transmitter part

CMCON = 7 'Alla I/O Digitala
LEDPin VAR PORTB.4
TransmitterPIN VAR PORTA.0
INCLUDE "modedefs.bas"
Counter VAR BYTE
Synk VAR BYTE
Synk = $55
DEFINE CHAR_PACING 500
Counter = 0

Main:
HIGH LEDPin
PAUSE 100
LOW LEDPin
PAUSE 100

SEROUT TransmitterPIN,T2400,[Synk,Synk,9,Counter]

HIGH LEDPin
PAUSE 100
LOW LEDPin
PAUSE 100

Counter = Counter + 1
PAUSE 600
GOTO Main
END


Receiver part

Define LOADER_USED 1

' Define LCD connections
define OSC 20

DEFINE LCD_DREG PORTC 'LCD data port
DEFINE LCD_DBIT 0 'LCD data starting bit 0 or 4
DEFINE LCD_RSREG PORTB 'LCD register select port
DEFINE LCD_RSBIT 7 'LCD register select bit
DEFINE LCD_EREG PORTB 'LCD enable port
DEFINE LCD_EBIT 5 'LCD enable bit
DEFINE LCD_RWREG PORTB 'LCD read/write port
DEFINE LCD_RWBIT 6 'LCD read/write bit
DEFINE LCD_BITS 8 'LCD bus size 4 or 8
DEFINE LCD_LINES 2 'Number lines on LCD
DEFINE LCD_COMMANDUS 2000 'Command delay time in us
DEFINE LCD_DATAUS 50 'Data delay time in us

TRISC = %00000000 'Set port B as output
TRISB = %00000000 'Set port D as output
low PORTB.6 'Set the R/W bit to low

pause 1000 'wait until the LCD initializes

INCLUDE "modedefs.bas"
Counter VAR WORD
ReciverPIN VAR PORTC.0
ADCON1 = 7 ' Alla digitala
PAUSE 500

Main:
SERIN ReciverPIN,T1200,[9],Counter
GOSUB LCD
GOTO Main

LCD:
LCDOUT $FE,1
LCDOUT $FE,$80,#Counter
PAUSE 500
RETURN

END

[mister_e]

On the receiver code, you must change your ReciverPIN to PORTA.0, Counter must be a Byte, also baudrate must be the same on both sides.

On the transmitter side, there's a missing DEFINE OSC 20.

I will suggest you to test it without the RF modules for now. Once you have something workable, just add the modules.

Make sure the PIC config fuses are correctly set. At least HS_OSC and LVP_OFF.

[rano_zen06]

On the receiver code, you must change your ReciverPIN to PORTA.0, Counter must be a Byte, also baudrate must be the same on both sides.

On the transmitter side, there's a missing DEFINE OSC 20.

I will suggest you to test it without the RF modules for now. Once you have something workable, just add the modules.

Make sure the PIC config fuses are correctly set. At least HS_OSC and LVP_OFF.

first of all..thanks mister_e for reply.I already change the code and increase my baud rate.But the result goes the same.My LCD still display nothing, but something unexpectedly happens, when I disconnect the power supply at transmitter board, my LCD at receiver part shows a number.What's actually happens ?Do I need to use encoder/decoder IC? and one more ,how do I test it without RF modules? some tips please? your answer will be greatly appreciated.

here's my new code

Tx part

DEFINE OSC 20
CMCON = 7 'Alla I/O Digitala
LEDPin VAR PORTB.4
TransmitterPIN VAR PORTA.0
INCLUDE "modedefs.bas"
Counter VAR BYTE
Synk VAR BYTE
Synk = $55
DEFINE CHAR_PACING 1000
Counter = 0

Main:
HIGH LEDPin
PAUSE 100
LOW LEDPin
PAUSE 100

SEROUT TransmitterPIN,T9600,[Synk,Synk,Synk,Synk,Synk,Synk,9,Counter]

HIGH LEDPin
PAUSE 100
LOW LEDPin
PAUSE 100

Counter = Counter + 1
PAUSE 600
GOTO Main
END

Rx Part


Define LOADER_USED 1

' Define LCD connections
define OSC 20

DEFINE LCD_DREG PORTC 'LCD data port
DEFINE LCD_DBIT 0 'LCD data starting bit 0 or 4
DEFINE LCD_RSREG PORTB 'LCD register select port
DEFINE LCD_RSBIT 7 'LCD register select bit
DEFINE LCD_EREG PORTB 'LCD enable port
DEFINE LCD_EBIT 5 'LCD enable bit
DEFINE LCD_RWREG PORTB 'LCD read/write port
DEFINE LCD_RWBIT 6 'LCD read/write bit
DEFINE LCD_BITS 8 'LCD bus size 4 or 8
DEFINE LCD_LINES 2 'Number lines on LCD
DEFINE LCD_COMMANDUS 3000 'Command delay time in us
DEFINE LCD_DATAUS 200 'Data delay time in us

TRISD = %00000000 'Set port B as output
TRISB = %00000000 'Set port D as output
low PORTB.6 'Set the R/W bit to low

INCLUDE "modedefs.bas"
Counter VAR byte
ReciverPIN VAR PORTA.0
ADCON1= 7
PAUSE 500

Main:
SERIN ReciverPIN,T9600,[9],Counter
GOSUB LCD
GOTO Main

LCD:
LCDOUT $FE,1
LCDOUT $FE,$80,#Counter
PAUSE 500
RETURN

END

[mister_e]

when I disconnect the power supply at transmitter board, my LCD at receiver part shows a number.What's actually happens ?

What you receive is some kind of noise generated by the transmitter... kinda garbage stuff... normal thing.

Do I need to use encoder/decoder IC?

Not suppose to. Can you post your RF module model?

and one more ,how do I test it without RF modules? some tips please?

remove your RF module, and connect your transmitter PORTA.0 directly to your receiver PORTA.0 pin.

<hr>
Since you're using True mode, i will suggest you to add the following line in your transmitter code, just before the Main label

HIGH TransmitterPIN
PAUSE 100

This will ensure your TransmitterPin idle at the right logic level before sending your data.

HTH

[mackrackit]

What PIC are you using? Does it have an ADC that needs disabled?

When testing the com link with wires, do not forget to also connect the ground between both circuits.

[mister_e]

See pics in POST#1. 16F877A, and seems ADCON1 and CMCON settings are right.

Once the wire connection will work, i may suspect 2 other things.
1)open collector output of the receiver
2)use inverted mode instead. so the pin will idle low.