Orion AstroView 6" Newtonian
Explore Scientific 24 mm [68°], 14 mm and 8.8 mm [82°]
Explore Scientific 2x focal extender
Thank You, Matt - Astro-Video Systems http://www.astro-video.com/ Home of the NO AMP-GLOW Astro Video Cams
Ron NS11GPS Pronto
16" dob Vixen NA140SS
127mm F9 Surplus Shed/Crawmach kit scope
Best of ATM
Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.
Quote:google for David Ek digital setting circles . An older project but nothing has changed in the meanwhile.
-DannyMy warehouseMy Channel
Quote:This is fun - lots of different designs that converged to a similar solution. .... BTW, I found that the arduino was plenty fast enough polling encoder pulses rather than using an interrupt approach. Easier software to write! It manages a 60Khz polling rate on the encoder states, which is fine given the 18k encoder ticks per axis revolution. Code written in C as well, so hardly optimised.Encoders attached directly to the axes so no problem attaching clock drives where they normally go. ....Simon
Quote: From a technical stand point, while it is fun to build a direct read out device, it is going to take a fair amount of time while if you built an encoder interface you can take advanatge of the software already written, much of which is free or inexpensive and all the power of the devices they run on. - Dave
Quote:I don't know much about Dave Ek's DSC interface I'm afraid. I understand (I think) from some of the links posted here that the DSC interface counts encoder ticks and then transmits the counts on command from the computer.So far so good. The control CPU s/w in my project could be changed to do this - currently the head-end CPUs repeatedly issue the counts over their 9600 baud serial links without being instructed. The central CPU just has to listen when it wants an encoder position update. The other issue is what is the format of the data on the serial links: this project expects an encoder count in a specified format - 8 ascii hex digits and delimiter characters.
Quote:All easy enough to change - the software C source is available on the site if you want to have a go.
Quote:An easier approach if you are not bothered about the EK i/face would be to connect your existing encoders to the head end units: the business end of these expects a 5V signal wiggling up and down representing encoder ticks. This is pretty much a standard output from most encoders I think. Any idea how many counts per axis rotation your encoders give ? I won't say plug and play, but could be close.
Quote:If you are going to make a control and display unit you might as well make the head end units as well - they are actually a lot simpler than the control unit.Simon
Quote:If it wasn't for the serial interface issue, your circuit would be a serious contender, but I sill need that USB interface,.... or do I?
Rob ... my avatar pic is me ... on a good day! ********************** SV-105T Canon 12x36 IS binos Pan 22 Nag 12T2 Delos 8 XCEL-LX 7mm Nag 5T6 Previous Scopes: .... many apos and a few dobs!