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New version of the Hollow Clock is released. Contrary to the former version (Hollow Clock 3), the angle of the hour hand is controlled not mechanically but magnetically. Very easy to adjust the time.

- Three 8mm x 3mm neodymium (neodym) magnets
- 28BYJ-48 stepper motor and its driver board
- Arduino nano
- 2mm tapping screws (short : 5, long : 1)”

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