Re: Signaling over powerline help

On Fri, 30 Dec 2005 11:12:54 -0500, ken wrote:

> Hello,
> I would like to know if someone can point me in the right direction.
> I'm looking for a schematic that would allow me to send and receive
> data over the power lines in a house. I did a search on google under
> the following and did not find anything, I could use as a starting
> point: Signaling over powerline circuits, bpsk circuit, and binary
> phase-shift keying circuit. Thank you in advance, Ken

Spehro is right, forget this scheme. Use wireless.

There are cheap tx-rx pairs that might serve over a 30m or so,
particularly in wood frame houses. Search for TLP434 and RLP434. You also
need an encoder and decoder, unless you want to do it yourself using
bit-banging, which is ill advised. One encoder-decoder pair are the ones
from Holtek, the HT12E/HT12D pair. This set works well with a short
wire antenna, and can be extended using better antennas.

For less than $20 US, you can easily build a one-way channel between two
microcontrollers that will support a data rate of 500 bytes/sec.

You might also be able to use the encoder / decoder chips over the
powerline (using transformers of some kind, I'm guessing), but you run
into the issues others have pointed out.

Finally, I seem to recall a technote from national that shows how to
transmit music over powerlines. That might also have some tips.

--
Regards,
Bob Monsen

Mathematics compares the most diverse phenomena and discovers the secret
analogies that unite them.
- Joseph Fourier
.

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