a clock, a movement rechargeable system, and...

[IHOXOHI]

Hey,
I have the project to make a 'home-made-micropython-digital-clock' which can be rechargeable by a system of movement (from a human if possible, I think).
For moment, a board could use only 2mA to keep the time on a litlle display, I tested the super-capacitor which could be litlle and easy to use... It seems possible... I'm looking for a system which can produce this energy... It seem's that a classical automatic watch use a mecanic system to move a metallic part which could be an aimant...? I tested different 'manual' rechargeable system; they can produce enought energy too...
My opinion is that it could be easy, too, to make a system which could work with the body and produce just 30mA for example...
If someone have a model to expose... It's about magnetic relations, which part of the body is the better choice for example...
I will start with an easy step, a human on a bicycle...
Thanks.

[peterhinch]

A conventional permanent magnet brushed DC motor works as a generator if you spin the shaft...

[bidrohini]

Generating Energy from human motion you can consider using Piezoelectric materials.

[scruss]

The term you're looking for is Energy harvesting (English) / récolte d'énergie (French). Many of the ultra-low power energy harvesting devices operate in the µA range, which is typically lower than many MicroPython processors need. Maybe one of the nrf processors might be micro-power capable, but it's going to have to be in deep sleep most of the time.

I'm about a decade out of date with what the available technologies are, but it's a whole subculture in electronics development.