Not 1wire, but an interesting project : http://www.ladyada.net/make/tweetawatt/
Get yourself any good CT like this: https://www.sparkfun.com/products/11005 If needed, a simple voltage divider will cut this down to something measurable. Standard practice for AC monitoring in panels in the industry I'm in. Colin > On Feb 8, 2014, at 8:55, Daniel MacKay <dan...@bonmot.ca> wrote: > > In theory, you should be able to take a very ordinary split core (the "clamp" > part) transformer, such as this: > > > http://www.onsetcomp.com/d-image/large/75-AMP-Mini-Split-core-AC-Current-Transformer_T-MAG-0400-75.jpg > > which generates a small AC voltage proportional to the current, and put a > diode on it to turn it to DC, and hook it up to a, say, DS2438 which can > measure voltages or current. > > BUT the trick is sizing the split-core transformer to produce the right > voltage range for the chip, which measures... uh... up to 15 volts? I think? > > I notice there's a complete kit here: > > http://www.hw-group.com/products/sensors/30A-Current-probe-1W-UNI_en.html > > But I suspect it's stupid expensive. > > Also with the DS2438 you should be able to get it to "log" the amps that have > passed through since it was last powered up which could be convenient. > > > >> On 2014-02-08, at 11:24 , Daniel MacKay <dan...@bonmot.ca> wrote: >> >> Hello all! >> >> Does anyone have an inexpensive (say, under $50 type of thing) 1-Wire AC amp >> (clamp type, obviously) sensor solution? >> >> I need to measure common household amps - so up to, say 30A would be fine, >> say, with 0.5A accuracy (or so.) >> >> Any thoughts would be welcome. >> >> -dan >> ------------------------------------------------------------------------------ >> Managing the Performance of Cloud-Based Applications >> Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. >> Read the Whitepaper. >> http://pubads.g.doubleclick.net/gampad/clk?id=121051231&iu=/4140/ostg.clktrk >> _______________________________________________ >> Owfs-developers mailing list >> Owfs-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > ------------------------------------------------------------------------------ > Managing the Performance of Cloud-Based Applications > Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. > Read the Whitepaper. > http://pubads.g.doubleclick.net/gampad/clk?id=121051231&iu=/4140/ostg.clktrk > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121051231&iu=/4140/ostg.clktrk _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
