On Tue, 23 Feb 2010 [email protected] wrote: >>> Anyone have other suggestions for functionality? >> >> Integrator, DAC, bidirectional counter ('quadrature'). > > What sort of integration are you talking about here? voltage sampling? sounds > interesting
Yep, take a sample every x ms and add to a counter. > Can you explain the bidir counter/quadrature concept? i'm not familliar > with that Well a simple example is a mouse, which has to keep track of how many pulses it's had, and what direction they were. I wrote something up ages ago: http://njhurst.com/electronics/generalising_quadrature.xml It's really a form of integration, a 1wire example might be a device which reads a power meter which has grid connected solar and could thus turn backwards as well as forwards. Or a lightweight propeller in a duct measuring total volume of air moved. >> The 2490 only cost me $16, but I think this is interesting because it >> removes the dependance on maxim. > > sorry, i used the DS2490 as an example (since that's what owfs calls it), but > really what i'm after is making a DS9490R clone > > For someone handy with electronics, making a (set of) 9490s should be > quite cheap, depending on code size. An ATTiny45 could probably handle > it. Just a few external components should be sufficient to make the > clone. (2-4 diodes, 1 cap and some connectors. Who doesn't have an old > usb mouse or KB they can scavenge the cable from?) Yep, or someone could make a business selling them :) So are there any shortcomings of existing adapters which would be worth addressing? njh ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
