Astra: Barn Door Tracker with Straight Drive Screw
thingiverse
Barn-door type astro tracker without the need for bending screws. An Arduino is used to control speed of the screw to maintain constant angular velocity. Uses 28BYJ-48 so can be driven with any USB power supply. Hardware: M4 nuts and bolts, 1/4in nuts and bolts, 28BYJ-48 stepper and controller, 608ZZ bearing, R188 bearing, 7mm or 1/4in aluminum tube, Hinge (I don't have a part number for it...) Arduino code: https://atlantisq.wordpress.com/2019/04/04/obj-2301-astra/ No longer updated -- currently working on V2： https://www.thingiverse.com/thing:4736742
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