holo clock

pinshape

Summary Update 2 (2016/11/25) - New Features Added Printable spacers and a motor mount plate have been added for easy installation of the 20mm NPM Motor. Update 1 (2015/02/06): Assembly Sequence Sheet Added This simple clock is based on a single geared stepper motor, which can be found in surplus for just $10. The motor, a 1:30 geared motor running at 12V with a 3mm shaft, is driven by an ATtiny2313 and L293DD circuit using Arduino IDE code. The single motor powers a gear train that moves the minute ring and hour ring. The ATtiny pulses the motor every minute to move the minute wheel and hour wheel. Buy now at: https://www.tindie.com/products/ekaggrat/holo-clock-2/ Watch a video tutorial: https://www.youtube.com/watch?v=1EtiEFQ4Aqg Assembly Instructions: Print all parts with a minimum layer height of 0.2mm. Required fasteners include: * M3 x 45mm (4) * M3 x 25mm (2) * M3 x 22mm (1) * M3 x 10 grub screw for motor gear * M3 nut (7) for NPM Motor (optional) * M2 x 10 * M2 nuts (2) for BJ25/BJ20 Motor * M3 x 15 self-tapping screws (2) PCB spacers are required, which can be printed or cut from brass/copper tubing. The specifications are as follows: * 4.5mm outer diameter x 3.5mm inner diameter x 12mm length (2 pieces) * 4.5mm outer diameter x 3.5mm inner diameter x 8.5mm length (4 pieces) * 4.5mm outer diameter x 3.5mm inner diameter x 6.5mm length (2 pieces) For the stepper motor, you can use any 20mm or 25mm diameter geared motor with a ratio of more than 1:10, bipolar or unipolar.