On Fri, Oct 29, 2010 at 1:22 PM, Chris Radek <[email protected]> wrote:
> On Fri, Oct 29, 2010 at 06:13:48PM +0100, Andy Pugh wrote: > > On 29 October 2010 17:58, Stuart Stevenson <[email protected]> wrote: > > > > > ?Is there a chip or reasonable board I can use to change the sine waves > to > > > pulse or quadrature? > > > > I suspect that the Pico Resolver converter might work > > I'm pretty sure these scales are optical. If it's the one I remember > fiddling with, it's got light bulbs. I suspect the signals are just > unconditioned light level detection. > > I'm not sure I know the right terminology to describe it, but they use > a second piece of glass with the same pitch (?) lines in front of the > master one. The second glass is at a slight angle so as you watch the > light shining through it as you move the head, there is something like > a moire pattern (?) that makes large areas of light and dark move > perpendicular to the head's motion. It is these lines that are > detected optically. For this reason I doubt there is interpolation. > I bet the lines are the resolution of the device. I think they were > too fine to see by naked eye. > > I bet very basic signal conditioning (thresholding) will be adequate > to read this at full resolution. > > Yes the scales are optical as you describe. I changed the bulbs and set the gap and angle for the greatest signal strength. I have no idea of the basic resolution. That is what I am trying to find out at this time. > 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 > -- dos centavos ------------------------------------------------------------------------------ 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
