First of all, many thanks to all of you for the answers.
Then I think I need to say a word about my actual electrical and electronic
skills :)
Several decades ago I studied electronics, so there is some basis. I have
never exercised these skills, I always dedicated to informatics all my
energy... So certainly do not remember or diagrams or formulas, let's say I
have a vague idea of how things work :) Let's say I speak a little "black
blocks", and for example, to make my first small circuit connected to OWFS,
I worked by copying and adapting patterns and examples. For calculations,
for example, resistors, of course I had to ask :)
So let's get to my initial inquiry.
Obviously what they would like to accomplish, I would be more
confident in implementing
it with elements, techniques and technologies that are already known to me, and
preferably working "out of the box", simply to put together, maybe with the
glue .... software!
A great example that I have seen, on which I am arguing is that of
OpenEnergyMonitor (thanks to Mark). Although, as I said, I should consider a
different platform, such as the not yet released Yun (Arduino & Linux) or
the BeagleBone Black (thanks to Jerry Scharf, in another thread, I'm aware
...) it seems that both have analog input pin.
Or even the RaspberryPi, but I've read things that seem to deny the
possible use in an environment that is not hobby or development (stability
of the USB port, rather than the possible need to add a resistor to the USB
port?).
Interesting the p4trykx proposal, but I would like to limit the
intervention on existing plants, in this sense I prefer the approach with
the Hall effect (thanks Martin), such as the aforementioned
OpenEnergyMonitor.
Andrew, I think I come to a conclusion close to you, that I may not be able
to do this project with 1-wire, and also I'm looking for more details about
the electrical characteristics involved.
Interesting also the Oleg proposal, but unfortunately is out of my
ability: take
me too long to learn how to properly handle the PIC or AVR, although it could
probably be the most resistant to an industrial environment, and would go
back inside to project the 1-wire :)
Now I am waiting for more information, to better define the project.
When I have more details and ideas less confusing, I will update.
For now, thank you very much
Giulio
PS: I'd like to share the 1-wire circuit that I have already made, could
you maybe give me some suggestions :)
2013/5/25 Jerry Scharf <[email protected]>
> Giulio
>
> I could go into a long discourse about measuring AC, but the simple truth
> is that this is something to be taken very seriously. Since you say there
> are high currents involved, it is a completely lethal situation as well as
> a potential fire risk. Unless you are completely sure of what you are doing
> and have total buy in from the site electricians and engineers, this is not
> something to be building yourself. I do code compliant residential and
> light industrial electrical work and would never dream of cobbling together
> anything in the setting you describe.
>
> Once you make this leap, then we can look at systems that can do what you
> want and look at how to integrate them into your monitoring.
>
> For things like this, it is often better to start what you are trying to
> do, since that almost always drives what can be used to accomplish the
> task. Monitoring AC is a wide field (sorry for the pun) and we need a bit
> more understanding.
>
> Pulse output power meters have already been mentioned, and are really the
> place to start. These put out a pulse for every so many electrons that
> pass. These can be collected by a few different 1-wire counters with little
> or no added circuitry and are totally safe to work with. It helps to put a
> bit of software logic in to deal with the low power situation, since you
> are getting infrequent pulses.
>
> Smart meters and power measurement systems will give multiple types of
> data. These are mostly accessed via serial, ethernet and/or wireless, so
> you will need to fold that back into your monitoring system separately from
> the 1-wire. These can be quite modest in price (by my thinking) and can be
> found in the US at around $200. The electrician's cost of wiring them up
> will be more than the cost of the unit.
>
> jerry
>
>
> On 05/24/2013 11:27 AM, Giulio Carabetta wrote:
>
> Hello!
>
> I'm thinking about a new project, about monitoring AC power lines, in
> industrial environment (tipically AC 220@50Hz, hi current...).
>
> I have some little experience with owfs, and I'm reading this list from a
> lot, so I was thinking about a solution with a linux based small hardware
> (like raspberry or arduino or odroid, ecc).
> I remember I read something like this, maybe with DS2450 (no longer
> available?) or also with DS2438. But I don't know how this is applicable,
> for the measurement and for an industrial production area.
>
> Can be better to move to i2c? I've seen some "power and energy measurement
> IC", even from Maxim, with I2C bus, but it will be totally new for me.
>
> And, to make more complicated all, I must admit that I'm not so strong on
> the electric/electronic side... :)
>
> Any suggestion will be very appreciated
>
> Many thanks
>
> Giulio
>
>
> ------------------------------------------------------------------------------
> Try New Relic Now & We'll Send You this Cool Shirt
> New Relic is the only SaaS-based application performance monitoring service
> that delivers powerful full stack analytics. Optimize and monitor your
> browser, app, & servers with just a few lines of code. Try New Relic
> and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may
>
>
>
> _______________________________________________
> Owfs-developers mailing
> [email protected]https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
>
>
> ------------------------------------------------------------------------------
> Try New Relic Now & We'll Send You this Cool Shirt
> New Relic is the only SaaS-based application performance monitoring service
> that delivers powerful full stack analytics. Optimize and monitor your
> browser, app, & servers with just a few lines of code. Try New Relic
> and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may
> _______________________________________________
> Owfs-developers mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
------------------------------------------------------------------------------
Try New Relic Now & We'll Send You this Cool Shirt
New Relic is the only SaaS-based application performance monitoring service
that delivers powerful full stack analytics. Optimize and monitor your
browser, app, & servers with just a few lines of code. Try New Relic
and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may
_______________________________________________
Owfs-developers mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/owfs-developers
