PIC to PIC TX RX and PIC to PC COM RX ..a little help please

[mackrackit]

DEC net

Might be the missing link...on the display

If the LED goes low then I would say it is working, but try sending something else and see what happenes.

[Dennis]

Hi Dave

I still haven't solved the number 3 problem
Where should I place the DEC keyword in ? As I try to compile with DEC keyword in, MCS spits out compile errors.

I am using TLP-434 and RLP-434 modules.
With this in mind would you suggext I now start adding in manchester encoding ?
Should I be trying SERIN/OUT2, DEBUG and HSER first ? (these all worked well when the PIC's were wired together)

I see your lines of serin code pre-condition the receiver first, should i be sending more $55's ?

As always any help or suggestions,tips,tricks etc would be greatly appreciated.

Kind regards

Dennis

[mackrackit]

Well crap. The DEC modifier does not work with straight SERIN. Sorry about that.

Yes, setup for SERIN2/SEROUT2
get that working with wires and we will go from there.

The Manchester stuff is not needed at this time.

[Dennis]

Hi Dave

Great news ;-)

It's working :-) and I'm thrilled --thank you!

Using HSERIN both wired and wireless
WOOOOOHOOOOO!

Now I have a question...
I would say the receiver get's maybe one in every 50 sent packets, if I'm lucky ;-(
What do I need to change or try to make this better ?
The reason I am asking is because I would like to press button 3 on the keypad and that is transmitted and receiver number 3 switches on.
Does that make sense ?

Kind regards

Dennis

[dhouston]

I would say the receiver get's maybe one in every 50 sent packets, if I'm lucky ;-(

You need 2-3m physical separation between TX & RX. Otherwise, the superregenerative receiver and the transmitter will interfere with each other.

[Dennis]

Hi Dave Houston

Thanks million for the reply.

I have them even farther apart >3m
If I am closer I receiver more transmitted frames, as I move further so the number decreases.

I tried the same transmitter and receivers using your code as well but have no success when I use it but it does work when the two PICS are connected by wire !

I will most certainly try increasing or reducing the range...
and then update a little later :-)
I will also try your code using the PIC 12F629's as well

If you have any more suggestions I would happily try them and submit feedback

Thanks again

Dennis

[mackrackit]

I think the modules you are using are the same as Bruce sells, the RWS/TWS ones?
What are you using for an antenna and how long is it? Should be around 6.5 inches. Ground plane? Anything around that could be causing interference? A picture of the setup might help.

Can you post the code that is sorta working? At this point it could be a number of things. We have to rule out hardware or software.

Now try to tighten things up a bit.

TRAIN  VAR BYTE
train =  $B3
SYNK VAR BYTE
SYNK = $7E

SEROUT2 PORT??, BAUD?,[TRAIN, SYNK, DEC 23]

SYNK VAR BYTE
SYNK = $7E
MYVAR  VAR BYTE

SERIN2  PORT??, BAUD?, [WAIT(SYNK), DEC MYVAR]

[dhouston]

I tried the same transmitter and receivers using your code as well but have no success when I use it but it does work when the two PICS are connected by wire !

If it works wired but not wireless, the most likely explanation is that you have something amiss in the way you have connected the TX/RX modules.