RE: Electrisave protocol

["Paul Gale" <groups@xxxxxxxxxxxxxxxx>]

I might be interested in an adapter - can't offer any development
though bu=
t may be willing to beta test.

Any idea on ball-park figures as to cost?

Paul.



> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
> Dan Ward
> Sent: 17 January 2007 05:54
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Electrisave protocol
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> That sounds great.
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> I dunno if I would be interested in another PC adapter thou.
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> Do you think a RFXCom receiver or W800RF32 receiver could be used for
> this?
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> This could be a candidate for a Girder plugin.
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> Cheers
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> Dan
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> iaingoodhew wrote:
> >
> > Great news for anybody who has an electrisave usage monitor. I've
> > managed to reverse engineer most of the electrisave protocol and
> > read the electricity usage into the PC. It's really early days at
> > the moment but if there is significant interest a beta product
may
> > be on the cards. Details below:
> >
> > The electrisave units can monitor upto 3 elctrical circuits,
sensing
> > the electricity usage by the amount of current flowing in a
> > conductor using a sensor clamped around the wire. The unit sends
the
> > data to a remote display unit via radio on 433MHz, which can
display
> > the data in a variety of formats (current, Kilowatts, Cost etc).
> >
> > The prototype PC adapter consists of a 433MHz AM receiver and a
PIC
> > microcontroller. The PIC constantly monitors the 433MHz receiver,
> > and decodes any electrisave packets into a binary stream. The
data
> > is then sent as decimal bytes via serial to the PC, where the
data
> > is displayed in hyperterminal, or similar.
> >
> > Data is in the following electricsave format:
> >
> > Counter, UNIT ID, Current1, Current2, Current3, Unknown, Unknown
> >
> > Example below
> > 6,221, 40, 0, 0,42,22
> > 0,221, 39, 0, 0,35,2
> > 9,221, 37, 0, 0,42,198
> >
> > My UNITID was 221 in this example, but this changes if you reset
the
> > transmitter.
> >
> > The current is in tenths of an amp, so you can see I was drawing
> > between 3.7 and 4.0A. (I only have one sensor). This number can
> > easily be converted to kilowatts by multiplying by the voltage
220V.
> > The unknown bytes on the end are probably battery status, and
> > checksum.
> >
> > The counter on the front is used to aid power saving in the
battery
> > powered display. The transmitter always sends out the electricity
> > usage on the `0' of the counter, and intermediate values are only
> > sent if the value has changed. The receiver can be set to power
up
> > and receive data every sample, or only on the `0' value. Counter
> > values go from 0 =96 9.
> >
> > So to my question ....Is anyone interested in a PC adapter for
the
> > electrisave, if one is developed? I am looking to convert the
unit
> > to be a usb powered device, but would probably look for someone
else
> > to develop the PC datalogging. Any Beta units would have to be
> > purchased, as I cannot afford to finance this all myself. I am
> > looking for partners in this project to share development and
> > benifit the wider HA community. If anyone is interested contact
me
> > on or off list.
> >
> > Details of the electrisave can be found here.
> >
> > http://www.electrisave.co.uk/
<http://www.electrisave.co.uk/>
> >
> >
> >
-----------------------------------------------------------------------=
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> >
> > No virus found in this incoming message.
> > Checked by AVG Free Edition.
> > Version: 7.5.432 / Virus Database: 268.16.13/632 - Release Date:
> 16/01/2007 16:36
> >
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