Sounds like a wild experiment, but the voltage from a coffee bean root is probably a few millivolts. You could maybe spin a tiny piezo or LED, but a grinder? You’d need a big energy buffer and a high‑efficiency motor. Still, the idea is fun—just make sure the plant gets enough water and sunlight, or it will throw a tantrum. Try a prototype with a small DC motor first and see how many beans you can power.

Alright, I’ll grab a 0.1 A micro‑motor, a 470 µF cap, and wire a 5 V divider from the bean’s root output. I’ll set up a shallow pot with good drainage, keep the soil moist, and put it on a grow lamp. Once I connect the circuit, I’ll watch the gear tick. Fingers crossed the root’s millivolt trickle is enough to push a 0.5‑mm tooth. If it doesn’t spin, I’ll tweak the divider or add a boost converter. Either way, I’ll log the voltage and the gear’s response—science first, caffeine second. Stay caffeinated!