<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi,<div><br></div><div>Well I don’t know what the default sample rate on OEM is, but currentcost which is a very similar solution has a sample rate of ~6 seconds.</div><div><br></div><div>If you’re outputting data over a dedicated serial line, thats not a problem.</div><div><br></div><div>Lets turn the question round, how do you want to use the data ?</div><div><br></div><div>Cheers</div><div><br></div><div>Stuart</div><div><br></div><div><br></div><div><div><div>On 6 Sep 2014, at 12:24, Bo Herrmannsen <<a href="mailto:bo.herrmannsen@gmail.com">bo.herrmannsen@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">oh just getting precise figures as fast it can go<div><br></div><div>any idea on how responsive it will be?</div><div><br></div><div>say i switch on a kettle how long will it take before i would see it on the GLCD unit OEM have?</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-09-06 13:16 GMT+02:00 Kevin Wood <span dir="ltr"><<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The blinker would probably be more accurate, and avoid the problem of sampling each phase, and voltage, and putting them together to calculate total consumption. It wouldn't be as responsive to quick changes in load, but would give you excellent daily / weekly / monthly figures. Depends what you need?<br>
<br>
Kevin<br>
<br>
On 06/09/14 10:13, Bo Herrmannsen wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
hmm..... for electricity i could also use the "blinker".... it has 10000<br>
pulses for each KW/h... i have tried to look at it just before bed time<br>
where everything is off.... if i remember correct it was one blink every<br>
4 sec max....<br>
<br>
and with that it was only modem on the tv cable on plus fridge.... not<br>
much else...<br>
<br>
i just hope when they change it in a few months it will be the same<br>
res.....<br>
<br>
then again is using CT's better? of course the more precise the better<br>
<br>
<br>
2014-09-06 10:54 GMT+02:00 Kevin Wood <<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.com</a><br>
<mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>>>:<br>
<br>
I think you should be able to get one EMonTX to do the job. One word<br>
of warning, though. The current measuring setup on the EMonTx "out<br>
of the box" has about 100A full scale, and I think the resolution at<br>
"normal" levels of current draw is not really sufficient for<br>
measuring domestic background consumption.<br>
<br>
I gather from your post that you have 3 phase incoming mains as<br>
opposed to the single phase domestic supplies that are normal here<br>
in the UK. Since your consumption is split between 3 phases, current<br>
resolution will be all the more important.<br>
<br>
It's a while since I looked into it, but it might be worth figuring<br>
out what the resolution will be with the emontx and the current<br>
transformers you are using.<br>
<br>
I believe there was a design posted somewhere on the OEM forums for<br>
a current measuring setup with range switching to give better<br>
resolution.<br>
<br>
Best Regards<br>
<br>
<br>
Kevin<br>
<br>
On 06/09/14 08:43, Bo Herrmannsen wrote:<br>
<br>
Morning Kevin<br>
<br>
Its not on purpose that I pester you so much about this, its<br>
more that<br>
i'm just a 2nd rate PCB monkey and not a very good programmer :-D<br>
<br>
But it makes sense to go for 868, i did not think of the conrad<br>
valves.<br>
<br>
Logging this morning heat up of hot water to arduino serial<br>
console and<br>
then my plan is to get the 3 CT's i have back in the fuse box ( they<br>
barely fit)<br>
<br>
is my logic ok here;<br>
<br>
1 emon TX v2 should cover all i need in utility closet:<br>
<br>
<br>
heat meter with 2 ways IR com (2 digital pins)<br>
water meter with bouncy reed switch (1 digital pin)<br>
electricity with 3 ct's and one AC<br>
<br>
if any pins left then i allready have one DS18B20 chip in the<br>
top pocket<br>
of the hot water cylinder<br>
<br>
<br>
can one emon TX do the job or do i need 2?<br>
<br>
<br>
<br>
<br>
2014-09-06 8:54 GMT+02:00 Kevin Wood <<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.com</a><br>
<mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>><br>
<mailto:<a href="mailto:kevin@the-wood-family." target="_blank">kevin@the-wood-family.</a><u></u>__com<br>
<mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>>>>:<br>
<br>
Hi Bo,<br>
<br>
Been sidetracked onto getting a "boiler node" working for a<br>
second<br>
home before winter arrives (that's also loosely OEM / Opentrv<br>
related, so I'm going in the right general direction!) for the<br>
moment but I haven't forgotten about getting OEM working on<br>
the OpenTrv!<br>
<br>
I would say go for 868, on the basis that the OpenTRV stuff<br>
is fixed<br>
at this due to the rad. valves. That said, the OEM stuff<br>
I'm playing<br>
with is 433, due to some other requirements I have.<br>
<br>
Best Regards<br>
<br>
Kevin<br>
<br>
<br>
On 05/09/14 20:12, Bo Herrmannsen wrote:<br>
<br>
Just so i dont shoot myself in the foot, but what freq<br>
should i<br>
choose<br>
when getting OEM stuff?<br>
<br>
I want to plan ahead so that the RFM12Pi module from<br>
OEM also can be<br>
used to talk to OpenTRV units...<br>
<br>
I have just figured how to read out my Heat Meter from<br>
the IR<br>
optical<br>
interface which is a 2 way port that requires that you<br>
send data and<br>
then get data back... so it was not as easy as you<br>
would expect...<br>
<br>
now my next step is to get ready to log the data, for<br>
that i<br>
need a pi<br>
of course and then the radio module and their emontx<br>
v3... with some<br>
clever thinking that emontx should be able to monitor<br>
both water,<br>
electricity and heat at the same time...<br>
<br>
<br>
@Kevin: any progress on talking to OpenTRV units from OEM ?<br>
<br>
--<br>
<br>
|||||<br>
@(~Ô^Ô~)@<br>
-------------oOo---U---oOo----<u></u>____---------<br>
| |<br>
| Bo Herrmannsen |<br>
| |<br>
| |<br>
| "blessed are the "cracked", |<br>
| for its they who let in the light" |<br>
| Ooo |<br>
|_________________ooO____( )________|<br>
( ) ) /<br>
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<br>
--<br>
<br>
|||||<br>
@(~Ô^Ô~)@<br>
-------------oOo---U---oOo----<u></u>__---------<br>
| |<br>
| Bo Herrmannsen |<br>
| |<br>
| |<br>
| "blessed are the "cracked", |<br>
| for its they who let in the light" |<br>
| Ooo |<br>
|_________________ooO____( )________|<br>
( ) ) /<br>
\ ( (_/<br>
\_)<br>
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<br>
<br>
--<br>
<br>
|||||<br>
@(~Ô^Ô~)@<br>
-------------oOo---U---oOo----<u></u>---------<br>
| |<br>
| Bo Herrmannsen |<br>
| |<br>
| |<br>
| "blessed are the "cracked", |<br>
| for its they who let in the light" |<br>
| Ooo |<br>
|_________________ooO____( )________|<br>
( ) ) /<br>
\ ( (_/<br>
\_)<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr"><pre><pre><span style="white-space:pre-wrap"> |||||
@(~Ô^Ô~)@
-------------oOo---U---oOo-------------
| |
| Bo Herrmannsen |
| |
| |
| "blessed are the "cracked", |
| for its they who let in the light" |
| Ooo |
|_________________ooO____( )________|
( ) ) /
\ ( (_/
\_)
</span></pre></pre><pre style="white-space:pre-wrap"><br></pre></div>
</div>
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