Given that Arduinos are now sold in (almost) every super-market, and the programming IDE is free/open-source, and the C/C++ code is familiar to many, I would have thought the logical evolution of the "pictic" is to become an Arduino shield?
One drawback (AFAIK) is that e.g. Arduino Due doesn't have a dedicated counter/encoder input, like the dsPICs made for motor-control have. On the other hand the Due has 12-bit analog inputs (and DACs) that might work for interpolation. How fast can the QEI (quadrature encoder interface) on a dsPIC clocked at 140MHz count? Were you planning on using a dsPIC with two QEIs, for TIC start&stop coarse counting? For 1ns or 2ns resolution an analog (or fpga?) interpolator is required anyway? AW On Thu, Jan 23, 2014 at 4:10 AM, Tom Van Baak (lab) <[email protected]>wrote: > Hi Bob, > > It's pretty easy to get a tiny PIC or AVR down to 50 ns, so to me the next > sweet spot would be 1 or 2 ns. A couple of us are trying. Contact me > off-list re the dsPIC33. > > /tvb (i5s) > > > On Jan 22, 2014, at 5:53 PM, Bob Stewart <[email protected]> wrote: > > > > Tom, > > > > Do you know of any other PIC projects that get a greater resolution? I > was thinking of doing something with a dsPIC33 running at 140MHz or > greater, but I'm not sure I want to devote the time to if it's it's been > done. > > > > Bob > > > > > > > > > >> ________________________________ > >> From: Tom Van Baak (lab) <[email protected]> > >> To: Robert Atkinson <[email protected]>; Discussion of precise > time and frequency measurement <[email protected]> > >> Sent: Wednesday, January 22, 2014 7:39 PM > >> Subject: Re: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / > 1PPS phase comparison > >> > >> > >> As much as I'm fond of my picPET it has 400 ns resolution and not > intended to replace a 5 or 10 or 50 ns TIC (which is what the OP asked for). > >> > >> /tvb (i5s) > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
