"ken" <somewere@out.there> wrote in message
news:dfmar117fvqsf909lj1akicmd1okpt7kr0@4ax.com...
> 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
Instead of X10, try UPB.
Reply by Joerg●January 1, 20062006-01-01
Hello Bob,
> Spehro is right, forget this scheme. Use wireless.
>
PLC can work nicely, just not that old AM protocol of X-10. Wireless can
be much more of a challenge. For example, it is very hard to maintain an
ISM wireless link into our garage at a reasonable (or legal) power
level. Via PLC I can reach there with ease.
>
> 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.
>
With PLC you can do that for a few Dollars.
> Finally, I seem to recall a technote from national that shows how to
> transmit music over powerlines. That might also have some tips.
>
> 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
Reply by Spehro Pefhany●December 30, 20052005-12-30
On Fri, 30 Dec 2005 12:14:12 -0500, the renowned Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:
>On Fri, 30 Dec 2005 11:12:54 -0500, the renowned ken
><somewere@out.there> 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
>
>"carrier current"
>X10 + reciever, transmitter etc.
P.S. you can also look at the LM2893/LM1893 data sheets (the parts are
now discontinued but there are still thousands floating around) to see
some details of power line coupling using transformers and FSK
encoding/decoding.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by ken●December 30, 20052005-12-30
On Fri, 30 Dec 2005 12:14:12 -0500, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:
>On Fri, 30 Dec 2005 11:12:54 -0500, the renowned ken
><somewere@out.there> 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
>
>"carrier current"
>X10 + reciever, transmitter etc.
>
>As well as being potentially dangerous, it's not easy to get this sort
>of thing to work reliably. I suggest you forget about it and use
>wireless technology.
>
>If you're in North America, in a residential situaiton, with our split
>mains, you may also have to worry about getting data across the two
>sides. Commercial may use 208 3-phase so it's got double trouble.
>
>
>Best regards,
>Spehro Pefhany
Hi Spehro, I'm aware of the danger and plain to use opto isolators. I
also know about the split mains. Thanks, Ken
Reply by Spehro Pefhany●December 30, 20052005-12-30
On Fri, 30 Dec 2005 11:12:54 -0500, the renowned ken
<somewere@out.there> 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
"carrier current"
X10 + reciever, transmitter etc.
As well as being potentially dangerous, it's not easy to get this sort
of thing to work reliably. I suggest you forget about it and use
wireless technology.
If you're in North America, in a residential situaiton, with our split
mains, you may also have to worry about getting data across the two
sides. Commercial may use 208 3-phase so it's got double trouble.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by ken●December 30, 20052005-12-30
Hi Roberto and thanks for your reply. I not looking for something this
elaborate. I don't need the high transfer rate. I'll be using a PIC
micro and sending a few bytes to one or more PIC's. Ken
Reply by Roberto Waltman●December 30, 20052005-12-30
ken <somewere@out.there> wrote:
>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
Try searching for "powerline modem".
Phonex's "ReadyWire" looks interesting, but I
believe the web page saying "Available
soon for developers" has not changed in the
last couple years ...
( http://www.phonex.com/prd_readywire.htm )
Their Neverwire14 works very well, though.
There are similar products from several
other companies.
Roberto Waltman
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Reply by ken●December 30, 20052005-12-30
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