help with SERIN & SEROUT

[navaismo]

hello my name is Max I`m from Mexico

I have a problem; Im building a remote control using RF with modulation ASK, at the beginning I try to turn on and turn off a led. and Iam using the pic 16f84a. To turn on the led i used a switch and the command serout example:

if sw1=1 then
serout datout,N2400,{5}
end

to turn off i used another switch an the command serout

if sw2=1 then
serout datout, N2400,{8}
endif

the first test works very good even a 50mts of distance.
But my problem is here: I try to turn on and turn off with the same switch but i cant do this, why? i have some theory about.
when i use a one SW only have 2 (obvius)on/off, when is off the serout send the data again and again and when the SW do the same. the RX recieve the data time and time again with this the program behaves very rare.


how i can to do the tx send only one time the code, even the sw still on or off during anytime?

the rx: code is like this

rx:
serin datin, N2400,dato
if dato =5 then
high led
endif

if dato=8 then
low led
endif


I was reading the command serin is able to compare the entrance variables, but i dont know how

please any have an idea??? help me


P.S. my english is too bad sorry i hope you understand my problem

[mister_e]

Even it could be much than what you think, can you try that one and post resukt


Oldata var byte
Dato var byte

dato=0
oldata=1

rx:
serin datin, N2400,[dato]
if dato != Oldata then
if dato =5 then
high led
oldata-dato
endif

if dato=8 then
low led
oldata=dato
endif

endif

But you may/must need a synchro data, then receive the function you want to do. Lookj for the WAIT modifier.

A common protocol is Manchester, do a search within this forum you'll find the theory. But as you want to receive only 1 or few bytes, send some preamble data (like $aa, $55), then send a Synchro by, then your data). The receiver must wait the synchro, then get the data.

[navaismo]

thank you.
I will test with your code or similar, but i dont understand the syncrho data. the transmitter and recivier works with asyncronous data too.

[mister_e]

SEROUT SerPin,BAUD,["UUUUUSYNCHRO",YourByte]

RECEIVER SIDE


SERIN2 SerPin,BAUD,[WAIT ("SYNCHRO"),YourByte]

Or a variant of it.

[navaismo]

well, i tested the first program and doestn works, then I use a LCD (16X2) for view the variable in the Reciever, the lcd show me the number and show me how works my program and i can view that my program is wrong because the data is send time and time again, and before a while the data changes. I mean first put p.e.: 0,0,0,0,0,3,3,3,0,0,0,0 during the switch is off an suposed the lcd put only zeros. and "viceversa"

Then i try to fix the problem but now i doesnt pass anything, i cant recieve or i cant transmitt, i testes the pics and works perfectly, I thought that modules RF had been disturbed, And I connected pics directly and even so it does not pass anything, then I believe that it is my program and at this point already my mind is blocked some help?

here the two codes: (when it worked )

transmitter code:'TX CODIGO TRANSMISOR

INCLUDE "modedefs.bas"

TRISA=6

DATOUT VAR PORTA.0
ONN VAR PORTA.1
OF1 VAR PORTA.2
C VAR BYTE

TX:


IF OF1=1 THEN
C=2
ENDIF



IF ONN=1 THEN
C=5
ENDIF



IF C=2 THEN
SEROUT DATOUT,N1200,[0]
ENDIF

IF C=5 THEN
SEROUT DATOUT,N1200,[7]
ENDIF


GOTO TX



reciever code:'RX CODIGO RECEPTOR

INCLUDE "modedefs.bas"

TRISB=1

DATAIN VAR PORTB.0
LEDVER VAR PORTB.1
DATO VAR WORDS


RX:

SERIN DATAIN,N1200,DATO

IF DATO=0 THEN
LOW LEDVER
ENDIF

IF DATO=7 THEN
HIGH LEDVER
ENDIF

goto rx

[navaismo]

Hola, mi cabeza ya de plano tiene muchos golpes, como volví hacer todo, hagamos de cuenta que no uso los modulos rf, ahora solo comunico los pics con un cable directamente, pero no me sale nada. se supone que con un switch mando un dato para prender un led y si esta cerrado mando otro para apagarlo y no lo hace. ya revise los pics y si funcionan, ya me canse de cambiar el programa y nada la verdad ya no se que hacer. les juro que ya me duele la cabeza de estar piense y piense y nada mas no me queda. he hecho otros programas pero este en particular como me ha dado dolores de cabeza

alguna ayuda aqui los codigos:

'TX CODIGO TRANSMISOR

INCLUDE "MODEDEFS.BAS"


TRISA=1

BOTON VAR PORTA.0
VIATX VAR PORTA.1
LEDVE VAR PORTA.2
LEDRO VAR PORTA.3

pause 500
TX:


IF BOTON=1 THEN
GOSUB SEND1
ENDIF



IF BOTON=0 THEN
GOSUB SEND2
ENDIF


GOTO TX


SEND1:
SEROUT VIATX,N9600,[7]
LOW LEDRO
HIGH LEDVE
RETURN

SEND2:
SEROUT VIATX,N9600,[0]
LOW LEDVE
HIGH LEDRO
RETURN
.............................................
' RX CODIGO RECEPTOR


INCLUDE "MODEDEFS.BAS"

TRISB=1

VIARX VAR PORTB.0
LEDRO VAR PORTB.1
LEDVE VAR PORTB.2
DATO VAR BYTE

RX:

SERIN VIARX,N9600,DATO

IF DATO=0 THEN
HIGH LEDVE
LOW LEDRO
ENDIF


IF DATO=7 THEN
LOW LEDVE
HIGH LEDRO
ENDIF



GOTO RX:
.......................................

ya no puedo mas estoy frito alguna ayuda porfavor