[OpenTRV-dev] Getting some OEM stuff

[Kevin Wood]

I think you should be able to get one EMonTX to do the job. One word of 
warning, though. The current measuring setup on the EMonTx "out of the 
box" has about 100A full scale, and I think the resolution at "normal" 
levels of current draw is not really sufficient for measuring domestic 
background consumption.

I gather from your post that you have 3 phase incoming mains as opposed 
to the single phase domestic supplies that are normal here in the UK. 
Since your consumption is split between 3 phases, current resolution 
will be all the more important.

It's a while since I looked into it, but it might be worth figuring out 
what the resolution will be with the emontx and the current transformers 
you are using.

I believe there was a design posted somewhere on the OEM forums for a 
current measuring setup with range switching to give better resolution.

Best Regards


Kevin

On 06/09/14 08:43, Bo Herrmannsen wrote:
> Morning Kevin
>
> Its not on purpose that I pester you so much about this, its more that
> i'm just a 2nd rate PCB monkey and not a very good programmer :-D
>
> But it makes sense to go for 868, i did not think of the conrad valves.
>
> Logging this morning heat up of hot water to arduino serial console and
> then my plan is to get the 3 CT's i have back in the fuse box ( they
> barely fit)
>
> is my logic ok here;
>
> 1 emon TX v2 should cover all i need in utility closet:
>
>
> heat meter with 2 ways IR com (2 digital pins)
> water meter with bouncy reed switch (1 digital pin)
> electricity with 3 ct's and one AC
>
> if any pins left then i allready have one DS18B20 chip in the top pocket
> of the hot water cylinder
>
>
> can one emon TX do the job or do i need 2?
>
>
>
>
> 2014-09-06 8:54 GMT+02:00 Kevin Wood <EMAIL ADDRESS HIDDEN
> <mailto:EMAIL ADDRESS HIDDEN>>:
>
>     Hi Bo,
>
>     Been sidetracked onto getting a "boiler node" working for a second
>     home before winter arrives (that's also loosely OEM / Opentrv
>     related, so I'm going in the right general direction!) for the
>     moment but I haven't forgotten about getting OEM working on the OpenTrv!
>
>     I would say go for 868, on the basis that the OpenTRV stuff is fixed
>     at this due to the rad. valves. That said, the OEM stuff I'm playing
>     with is 433, due to some other requirements I have.
>
>     Best Regards
>
>     Kevin
>
>
>     On 05/09/14 20:12, Bo Herrmannsen wrote:
>
>         Just so i dont shoot myself in the foot, but what freq should i
>         choose
>         when getting OEM stuff?
>
>         I want to plan ahead so that the RFM12Pi module from OEM also can be
>         used to talk to OpenTRV units...
>
>         I have just figured how to read out my Heat Meter from the IR
>         optical
>         interface which is a 2 way port that requires that you send data and
>         then get data back... so it was not as easy as you would expect...
>
>         now my next step is to get ready to log the data, for that i
>         need a pi
>         of course and then the radio module and their emontx v3... with some
>         clever thinking that emontx should be able to monitor both water,
>         electricity and heat at the same time...
>
>
>         @Kevin: any progress on talking to OpenTRV units from OEM ?
>
>         --
>
>                            |||||
>                          @(~Ô^Ô~)@
>         -------------oOo---U---oOo----__---------
>         |                                     |
>         |  Bo Herrmannsen                     |
>         |                                     |
>         |                                     |
>         | "blessed are the "cracked",         |
>         |  for its they who let in the light" |
>         |                         Ooo         |
>         |_________________ooO____(   )________|
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>
> --
>
>                   |||||
>                 @(~Ô^Ô~)@
> -------------oOo---U---oOo-------------
> |                                     |
> |  Bo Herrmannsen                     |
> |                                     |
> |                                     |
> | "blessed are the "cracked",         |
> |  for its they who let in the light" |
> |                         Ooo         |
> |_________________ooO____(   )________|
>                   (   )    ) /
>                    \ (    (_/
>                     \_)
>
>
>
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