[OpenTRV-dev] Getting some OEM stuff
Bo Herrmannsen
EMAIL ADDRESS HIDDEN
Sat Sep 6 10:13:17 BST 2014
hmm..... for electricity i could also use the "blinker".... it has 10000
pulses for each KW/h... i have tried to look at it just before bed time
where everything is off.... if i remember correct it was one blink every 4
sec max....
and with that it was only modem on the tv cable on plus fridge.... not much
else...
i just hope when they change it in a few months it will be the same
res.....
then again is using CT's better? of course the more precise the better
2014-09-06 10:54 GMT+02:00 Kevin Wood <EMAIL ADDRESS HIDDEN>:
> 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 ?
>>
>> --
>>
>> |||||
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>> -------------oOo---U---oOo----__---------
>> | |
>> | Bo Herrmannsen |
>> | |
>> | |
>> | "blessed are the "cracked", |
>> | for its they who let in the light" |
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>> \ ( (_/
>> \_)
>>
>>
>>
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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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--
|||||
@(~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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