This electric coffee grinder is made exlusively of reclaimed components.
The grinding mechanism comes from an old wooden mill, the metals sheet
from a dysfunctional air duct, and the engine, well…is a drill.
It works entirely autonomously thanks to an integrated Arduino circuit board. A weight sensor (see picture) detects the empty port-filters and switches the drill on, after measuring exactly 20g of ground coffee the drill is neatly turned off.