Tws 434/ Rws 434

[mackrackit]

Manchester encoding is not a requirement. They are used extensively without it.

Agreed. When I was having my problems with SERIAL, tested RF by simply sending a high bit.

Kind of like Morse code. Instead of "..._ _ _..." it was "... ..."
DOTS = HIGH

[jmbanales21485]

sorry for the late reply, i have not had time to work on this till now.


so it tried what you said and sent %10101010 to stabalize the oscillators, (put it in the neutral zone). and now i am able to get something on the other end of the pic. however i can't seem to get it continously. in my sample program i am counting numbers continously in my transmitter side and sending it to my reciever to display it. it sends numbers but it does not send it continously.

i.e i send 1,2,3,4,5,6,7,8,9,10 and will recieve 1, 4, 6,9

how do i make my program more stable.

'=====transmitter=====
junk = $55
synch = "a"
dat = 0
loopa:
pause 1000
serout tx, N2400, [junk, junk, junk, junk, junk, synch, dat]
dat = dat + 1
if dat = 255 then dat = 0
goto loopa

'=====reciever======
synch = "a"
dat = 0
begin:
serin rx, 4, [synch], dat
pause 5:serout2 LCD, baud, ["start", 1, DEC (dat), 0]
goto begin

[dhouston]

For small amounts of data I prefer using the NEC protocol which has been around since the dawn of remote control and has been widely used by manufacturers of audio/visual gear.

I posted a short example for sending/receiving in the Code Examples forum.

http://www.picbasic.co.uk/forum/showthread.php?t=6261

[mackrackit]

After re-reading this I noticed

I tried my program directly from pic to pic and it works fine, the problem is when i add these 2 modules then it doesn't work. I am using the 12F683 with a 4 MHZ internal osc.

The internal osc will sometimes work and sometimes not. To be safe use an external osc. The ones with three pins have built in caps and prove to be stable.

At some point you will need a protocol like dhouston mentioned. Here is a link that has a lot of good reading http://www.linxtechnologies.com/Supp...ication-Notes/
App notes AN-00160 an AN-00232 might be of interest.

But...for sending one or two characters of data you should be "OK" if there is not out side interference. I send numbers like 11, 12, 13 or strings "HI" and so on with out using any protocol and works fine.
Try changing the osc and look at dhoustons link, good example.

[jmbanales21485]

i have 20MHz crystalz. Do i have to define 20Mhz in PBP or can i define 4Mhz.

[mackrackit]

i have 20MHz crystalz. Do i have to define 20Mhz in PBP or can i define 4Mhz.

Yes and no. I say this as some play with different speeds (over-clocking )or for some other reason. In you case

DEFINE OSC 20

in PBP.

Also you will need to change you *inc file to HS_OSC. Or read this for more on the configuration methods. http://www.picbasic.co.uk/forum/show...=6775#post6775