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'[PIC]:Manchester Encoding for low power RF module'
2003\05\21@110940 by dclark

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    I have a project where I am trying to send rs-232 data one way over a
commercial low power radio module, & am trying to use a 16f627 to encode
the data on the transmit side & another 16f627 to decode the data on the
receive side.  I have no control over the rs-232 data, since it is being
generated by another device @ 4800 baud with only Tx & SG signals.  I am
very
new to programming PIC's, so I really don't even know where to begin.
Would anyone have any experience with this type of application, or have any
suggestions on where to start?  I have searched everywhere I can think of,
but all I have found so far have been general references to Manchester
Encoding, nothing detailed enough to get me started.  Any help would be
greatly appreciated.

Thanks,
David

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2003\05\21@113718 by Olin Lathrop

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>      I have a project where I am trying to send rs-232 data one way
> over a commercial low power radio module, & am trying to use a 16f627
> to encode the data on the transmit side & another 16f627 to decode the
> data on the receive side.  I have no control over the rs-232 data,
> since it is being generated by another device @ 4800 baud with only Tx
> & SG signals.  I am very
> new to programming PIC's, so I really don't even know where to begin.
> Would anyone have any experience with this type of application, or have
> any suggestions on where to start?  I have searched everywhere I can
> think of, but all I have found so far have been general references to
> Manchester Encoding, nothing detailed enough to get me started.  Any
> help would be greatly appreciated.

We have experience in manchester encoding and decoding for RF and IR
transmission using PICs.  The latest completed project envolved
simultaneously decoding two RF manchester streams at 10KHz each and two IR
manchester streams at 1KHz each on a single 18F252.  Right now I'm working
on code for a 16F630 to produce a single manchester stream at 10KHz.

Please contact me off list if you want professional help.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

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2003\05\21@120841 by Tal

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David,

Fe questions, do you need bidirectional link or only one direction ?
Does the baud rate of the RS232 output from the receiving side must to
be 4800 ?  What is the max/recommended bit rate for your radio link ?
Does your radio link has any minimum requirements for bit rate or can
you send long ones and zero's ?  What is the interface of your radio
link (digital, analog, etc).


It's all depends of the requirements and the radio link you are using.
In the best scenario, you can simply connect the RS232 to the
transmitter and get the data on the other end. At the worst, you many
need to do some modulation/demodulation. You need to be able to answer
these questions before you dive into the specific of the PIC and if the
selection of the radio link is still open, try to find one that will fit
the requirements.

My 2C,

Tal

> {Original Message removed}

2003\05\21@130510 by Alan B. Pearce

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>Does your radio link has any minimum requirements for
>bit rate or can you send long ones and zero's ?

Well in this case because the data is coming from an RS232 source then there
will be a 1 to 0 transition in the data for every 10 bits, you are
guaranteed that there will be at least one 1 bit and one 0 bit every 10.
This should remove most synchronizing problems.

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