Rock tumbler - video

Rock tumbler. By Koss. 14:19 video:

https://www.youtube.com/watch?v=ug_dIsAm_Yo

Why the microcontroller?

Quote:

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Originally Posted by nova_robotics

Why the microcontroller?

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Because he can? I don't see a necessity there, but maybe it's easier for him than making sets of stepped pulleys.

Bill