That's it. Thanks Dick. They're talking about 10K RPM which seems like it would be an EMC2 issue. A diesel would not be quite so bad but even 3K raises a bit of concern about angular resolution. Engineers and math able folk among us will no doubt fix my humble work below.
1 -- assumes 50000 PPS parport pulse reader 3000 RPM = 50 RPS 50000/50 = 1000 pulses per rotation 360/1000 = 0.36 degree resolution 9600 RPM = 160 RPS 50000/160 = 312.5 pulses per rotation 360/312.5 = 1.152 degree resolution That's a pretty capable computer so a prototype would cost $350 or so plus the cost of the encoder. 2 -- assumes modest FPGA reader with 2 Meg ability 2000000/50 = 40000 pulse per rotation 360/40000 = 0.009 degree resolution 2000000/160 = 12500 pulse per rotation 360/12500 = 0.0288 Now we're looking at an investment of about $500 + encoder. With my pic inability that is still pretty inexpensive for a prototype. Absolutely no question but that I agree with those who would run any production model, or roadworthy device with pic or other micro devices. Add to these costs proper redundant processing and voting and it really tilts toward dedicated processing. But the idea of a prototype with HAL is still really attractive because most any of us could hack the .hal together in quick time and we would have expanded processing ability to run tests and tabulate results. Rayh On Fri, 2007-11-30 at 04:52 -0800, Richard L. Wurdack wrote: > EVIC > http://rbowes1.11net.com/dbowes/ > > Dick > ----- Original Message ----- > From: "Ray Henry" <[EMAIL PROTECTED]> ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
