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RE: [APML] Computerized Barndoor Tracker

Mike, you wont need a laptop to drive a barn door traker, just a microcontroller.  the math is fairly simple, when the boards are paralell, a radius of 11.46 inches a 1/4 -20 bolt drives 1rpm.  but as the boards pull apart, youll have to take the cosine I beleive of the rate or something.
 
Chris
-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]On Behalf Of M/S Heald
Sent: Wednesday, March 31, 2004 1:15 AM
To: astro-photo@seds.org
Subject: [APML] Computerized Barndoor Tracker

Hello!  I’d like to get some more information regarding computerized Barndoor Trackers.  As I develop my 4x5 inch camera, it seems that exposures will need to be 10 to 30 minutes in duration.  I thought I would try a single arm barndoor tracker instead of piggybacking it to my 8 inch LX200.

 

I saw Tom Kracji’s note from a couple of years ago.  I am not very code or electronics literate, but I can follow explicit directions on making the board and working with the computer code.  Can anyone direct me to info regarding the construction of a daughter board to connect a stepper to an old laptop, and info regarding the code to rive the stepper?  Thank you and best regards.

 

Mike Heald


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