Greg Lindahl <[EMAIL PROTECTED]> wrote > So, the thing that logs power usage over time seems to be the "Watts > Up Pro", which says that it plugs into USB and has a Windoze program that > graphs power usage. Does anyone have one, and can you access the data > sans Windoze program? Are there any other cheap logging power meters?
The Watts Up Pro is only $130 at Amazon right now - if your time is worth anything just buy one. If this is a one time deal and you have a USB Camera you set it to snap pictures of the display at fixed intervals, and then scan through those later. Or, if you already own a USB data logger and a Kill-a-watt, try this at your own risk. Most likely you'll end up filing the effort under "I wish I'd just spent the money on the data logging version"! On opening up a Kill-a-watt you'll find that one side has all the power goodies and a tiny amount of logic, and the other side contains the display, the buttons, and what looks like the logic to control the display. The two sides are connected by a 6 wire cable, where all of the wires are the same diameter, with no shielding and no twisted pairs. It seems likely that if one attached a voltmeter to those 6 wires one would find a ground, 5V (or 12V) dc, and 4 measurement lines, probably representing Line Voltage, Current, Line Frequency, and Power. If you're lucky the measurement values are encoded as a DC voltage. That would be easy to test, and if true, you could solder leads onto those 6 lines and bring them outside the case to attach to the input leads of your existing USB data logging device. Regards, David Mathog [EMAIL PROTECTED] Manager, Sequence Analysis Facility, Biology Division, Caltech _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
