Re: Electrisave protocol

[Dan Ward <mail@xxxxxxxxxxxxxxxxxxx>]

That sounds great.

I dunno if I would be interested in another PC adapter thou.

Do you think a RFXCom receiver or W800RF32 receiver could be used for this?

This could be a candidate for a Girder plugin.

Cheers

Dan

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 ? 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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