Silent Desk Clock

This is a completely silent motorized desk clock using an Arduino Nano and a CNC Shield V4 with a TMC2208 and a stepper motor. The gears are exposed and the sweep second provides a great look. The overall size of 9.5" (240mm) high by 9.1" (230mm) wide with a 6.15" (156mm) dial. A precision real time clock serves as a reference timer with an accuracy of about a minute per year.  A video of the clock in action can be found at https://youtu.be/UFyCKlxqVp0 An updated driver circuit was uploaded in January 2023 that is even quieter and can be built using easier to find components. A video showing this improved motor drive circuit is at https://youtu.be/PR4PXR7RXEY A slightly more elegant version of the clock controller is available on my Etsy store at https://www.etsy.com/listing/1464560995/silent-shield-clock-controller   The primary non-printed components are:      Ardiuno Nano     CNC Shield V4 (or Silent Shield Clock Controller from Etsy)     TMC2208 stepper motor driver     DS3231 prec