On Fri, Oct 29, 2010 at 11:58:10AM -0500, Stuart Stevenson wrote: > Gentlemen, > I have a manual CMM with scales. The display box is very old and almost > functional. I would like to replace it with EMC2. Simple enough except for > the scale feedback. The scale feedback is four sine waves at 0, 90, 180 and > 270. These are, I think, approx 1 volt magnitude. What can I use to get this > into EMC2 in a usable fashion. > The original display has an 'amplifier, check, divide' board. > I don't know the resolution of the sine wave. > I have an sn7404n chip and a couple germanium diodes hooked to a bread > board. I don't see anything out of the chip. I was expecting a pulse that > would allow me to determine the resolution. At this time I have exceeded my > electronics capabilities. > Is there a chip or reasonable board I can use to change the sine waves to > pulse or quadrature? > thanks > Stuart
I have a glass scale that gives a weird analog sine wavey signal. I was able to find some conditioned quadrature inside the amplifier box, and I ran that into a mesa card. I think there were only two sines 90 degrees apart though, so the conditioning was probably simple zero crossing detection perhaps with a bit of hysteresis. With your four signals maybe you just have the differential equivalent of mine? I suggest a little more deciphering of the amplifier board and/or poking with the scope. I'll try to help in two weeks if you don't get it by then. Chris ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
