Motorized Stars Tracker

thingiverse

This astrophotography mount, also known as a barndoor, Scotch, or Haig mount, allows long exposure night sky shots by counteracting star movement. Learn more on Wikipedia (http://en.wikipedia.org/wiki/Barn_door_tracker). The displayed model is made of pine but should be crafted from hardwood like maple. Vibrations affect camera images, so improvements are being made; stay updated. Assembly instructions: print parts and cut 9 1/4" and 12" pieces of 3/4" x 3/4" hardwood. Attach a 1/4" filleted rod with an 11.45" (291mm) radius. Follow the picture guide, ensuring 11.45" distance between bearing and rod centers. The electronics use an Arduino, Alegro 5804 driver, and a stepper motor; consider alternative parts like Adafruit motor shield and Nema 17 motor. Find more info on the author's blog (http://basbrun.com/2009/07/10/arduino-timer-interrupt/). Watch a video of the mount in action on YouTube (http://www.youtube.com/watch?v=q-sFi-ZAZ7o).