Bruce, Yes that's exactly my plan. No GPS and designed for field use. A halfway decent crystal with interpolation from 1 PPS timestamps should provide decent results. And anything else I can dream up.
Bottom line is I need to know which micro-controller to embrace. Thanks Didier for your suggestion. Any others? Jim 2008/8/13 Bruce Griffiths <[EMAIL PROTECTED]> > Jim Palfreyman wrote: > > Hi Folks, > > > > Well I have a nice idea in my head for a lunar occultation timer. > Basically > > it's a normal clock that accepts a push button click and records the UTC > of > > the events. Multiple events can be recorded and displayed back. The time > > must be settable and could also accept an external 1 PPS for accurate > time > > setting. It also needs to be portable and battery powered. When it does > get > > 1 PPS time setting it could work out how good its oscillator is an adjust > > for it. etc. etc. and etc. > > > > I have lots of other ideas in my head too and it's about time I settled > down > > and thoroughly learned a decent micro controller. I want to pick one, get > > the stuff I need and commit to it. I've had experience with Atmel > AT90S2313 > > but really want something with more memory, a decent number of io pins > and > > I'd like to avoid assembler. > > > > It needs to drive a display of some form (standard LCD is fine but other > > options would be good) and since nearly all my references are based on > 10MHz > > it would be nice if it could be clocked at that speed. I used to program > the > > Acorn Achimedes and so ARM would be nice and since I'm a 20 year > experienced > > C programmer (not C++) then that is what I'd like to program it in. > > > > Thoughts, ideas, comments would be appreciated! > > > > Oh and cheap! > > > > :-) > > > > Regards, > > > > Jim > > > Jim > > Is this intended for field use? > If so, one has to remember that it will not always be easy or practical > to set up a GPS receiver on site. > Provision for using the timer as an interpolation device to interpolate > between timestamps obtained before and after the event from a fixed > location reliable GPS receiver would greatly enhance its usefulness. > Sometimes its hard enough to setup and acquire the star or other object > of interest without having to worry about a GPS receiver as well. > > Bruce > > > Bruce > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.