Quote:
Originally Posted by p3nn
Hi Peter
Thx for the advice. Had a quick look thru Jaycar as well and it seems they have that sort of kit available as well so may well look into that. At this point I'd be happy to just get it so I can control the speed inthe appropriate directions so as to be able to do some astrophotography, i.e. to track the object I aim at. Tho later I'd likely update and make it a full pc driven job
James
|
Just beware of Jaycar steppers, they behave in very strange manner, as the steps are not equal. I suspect what they sell is not stepper motor, it seems to be asynchronous 2-phase low-voltage motor.
It will step, though..
The best approach for you would be to download Mel Bartels software, and to build the stepper motor driver (it is very simple really, just 4 transistors per motor and one buffer IC. The transistors do not have to be that big as suggested, as he wanted this driver to work with wider range of motor sizes).
The link for Mel's webpage is below.
http://www.bbastrodesigns.com/BBAstr...ted_Telescopes
The other approach is to build the small stand-alone stepper driver.. there are numerous designs availabe on the web (with PIC processors, many of them have even input for guiding). Also I can help here as I have number of PCB's (
http://www.iceinspace.com.au/forum/s...ad.php?t=45079) and you can have one, no probs.. The processor (old Motorola 68HC705KICS, i have a few leftovers) has to be programmed specifically for your mount, though, while Mel's software is configurable (however, it runs on DOS..)
And, another one here:
http://sites.google.com/site/picgoto/english-manual