Astra V2.1: Barn Door Astro Tracker with Straight Drive Screw

thingiverse

Barn-door type astrophotography tracker without the need for bending screws. Travel-friendly, easy to pack and can be driven by any 5V USB power source. An Arduino Uno or Nano is used to control speed of the screw to maintain constant angular velocity. project webpage: https://atlantisq.wordpress.com/portfolio/obj-2601-barn-door-tracker-astra-v2-1/ 21.11.08: Previous bug fixed in instructions. 21.10.10: Bug found: Step_tgt calculation did not take reduction gear into consideration. The reduction is 1:2 so multiply step_tgt by 2 to get correct results. 21.09.30: Updated webpage with details on calculating step_tgt in Arduino code and troubleshooting guide. 21.09.24:Updated with readable filenames on Thingiverse and WIP instructions for use on project webpage. Printed with PLA but other hard plastic should work fine too. You don't want this thing to flex. Use a strong slicing profile, 4+ perimeters, 4+ solid layers, and >30% infill. If your printer has trouble printing the stud on the gear, there is a NoStud version. The bottom quick release plate is the same dimensions as the Vanguard QS-36 QR plate. Alternative Arca-Swiss mount included. See project page for details. Hardware: M4 nuts and bolts, 1/4in nuts and bolts, T8x200 Leadscrew and nut 28BYJ-48 stepper and controller, Arduino Uno (nano should work), 608ZZ bearing, R188 bearing, 6702RS bearing, M8 axis or rod(That will fit inside 608ZZ bearing. If you are like me and can't find one that fits, a printable option is provided.) Ball head Assembly instructions and Arduino code: https://atlantisq.wordpress.com/portfolio/obj-2601-barn-door-tracker-astra-v2-1/ V1: https://www.thingiverse.com/thing:4736598