On Wed, Oct 19, 2011 at 08:40:40AM -0400, Christian Convey wrote: > You're right - I *am* looking for total energy expenditure (Joules, > Watt-hours, etc.) I have no specific desire to do that integration in > my own code.
What I used was a kit design from Silicon Chip in 2004, one retailer provides this as http://www.altronics.com.au/index.asp?area=item&id=K4600 but there are others. It is significantly more expensive than the consumer watt hour meters available today. It contains a chip that accumulates the counts independently, and a microcontroller driving the display and panel buttons. If I was doing what you are doing, I would replace the microcontroller with one that relays the readings over USB, serial, or ethernet. Then I'd worry about high voltage isolation and chuck in an optoisolator. I imagine there are better designs for the job. I'm only sharing my limited knowledge of the subject. ;-} Your later point about having the device do the counting and then seeing timed results reminds me of my very early work on the same subject ... a rotation sensor that emitted a millisecond counter alongside a rotation counter, so that it didn't matter when the host computer processed the data. http://quozl.linux.org.au/speedo/ -- James Cameron http://quozl.linux.org.au/ _______________________________________________ Nut-upsuser mailing list [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/nut-upsuser
