Filterwheel motorization

thingiverse

Motorization of a basic 1.25-inch filterwheel is achieved using an affordable 28BYJ48 stepper motor and a hall sensor for precise positioning. Designed to be printed in PLA, there's a gear for reduction to the already reduced stepper, making it really precise. Using a stepper allows you to not use any current when the wheel is at its target position. The entire system is driven by an Arduino Nano connected to the filterwheel using an RJ45 cable. To assemble this motorization, you'll need to drill two 3mm holes for fixation and glue a big wheel around the filters. Ensure that you have exactly the same filterwheel; otherwise, adjust it using the provided OpenSCAD file. A ball in the filterwheel holds its position, but this ball must be removed. Besides the printed parts, the bill of materials includes: * A 28BYJ48 stepper motor with its controller (~3€) * One US5881LUA hall sensor with a magnet - 2€ at MC Hobby * An Arduino Nano board * RJ45 connectors and cables * The filterwheel used appears under different names (at least here ) Additionally, I've built an ASCOM driver that allows using the filterwheel from most astro software under Windows. Schematics & more details are available here: http://pludov.blogspot.fr/2016/08/roue-filtre-motorisee-la-mecanique.html The source code for the Ascom driver is on GitHub.