Submitted by Eric Sandeen (not verified) on Tue, 02/16/2010 - 03:42.
Hey Trystan -
Nice work on this, you inspired me to order an Arduino and start playing with this a little.
One question and a couple suggestions -
The Farnell adapter you link to seems to be 9V DC out, not AC, so I'm a little confused - the link goes to a page that says "MC090S050U/F+ - ADAPTOR, REG, EURO, 9VDC, 500MA" - But ... DC?
One thing I'd like to do is monitor branch circuits, so I'm hoping to use smaller 40A or so CTs, DigiKey carries some, model CR8410-1000 for < US $10 each. The mfgr is CR Magnetics. But to do that I'd need more analog inputs; I think maybe an analog multiplexer like here could give you a lot of inputs. But, I'll just start with one for now to see how it goes. :)
Also I think the 10-bit ADC results in a pretty low resolution for the mains, so maybe interfacing to a higher-resolution ADC for the mains might be interesting.
The 1024 steps on a 15-20A circuit are probably enough...
Once branch circuits are monitored, I think a lot of interesting things could be done with the graphing.
Oh, and finally - do you have all of the code you've developed in a SCM (cvs, git, svn, whatever) anywhere?
Thanks! Awesome project.
-Eric
p.s. is http://power.openenergymonitor.org/ really accurate? Do you really stay mostly under 500W peak draw? That seems very low, if accurate it's impressive. :) I'm trying hard, and I can't get much under 500kWh per month. :)
Hey Trystan - Nice work on
Hey Trystan -
Nice work on this, you inspired me to order an Arduino and start playing with this a little.
One question and a couple suggestions -
The Farnell adapter you link to seems to be 9V DC out, not AC, so I'm a little confused - the link goes to a page that says "MC090S050U/F+ - ADAPTOR, REG, EURO, 9VDC, 500MA" - But ... DC?
One thing I'd like to do is monitor branch circuits, so I'm hoping to use smaller 40A or so CTs, DigiKey carries some, model CR8410-1000 for < US $10 each. The mfgr is CR Magnetics. But to do that I'd need more analog inputs; I think maybe an analog multiplexer like here could give you a lot of inputs. But, I'll just start with one for now to see how it goes. :)
Also I think the 10-bit ADC results in a pretty low resolution for the mains, so maybe interfacing to a higher-resolution ADC for the mains might be interesting.
The 1024 steps on a 15-20A circuit are probably enough...
Once branch circuits are monitored, I think a lot of interesting things could be done with the graphing.
Oh, and finally - do you have all of the code you've developed in a SCM (cvs, git, svn, whatever) anywhere?
Thanks! Awesome project.
-Eric
p.s. is http://power.openenergymonitor.org/ really accurate? Do you really stay mostly under 500W peak draw? That seems very low, if accurate it's impressive. :) I'm trying hard, and I can't get much under 500kWh per month. :)