Constraints for the prototype
- Not dangerous (no unprotected flywheel with spokes) if it is to be left in a school
- Be within my time budget (not big for the moment)
either an old stationary cycle where I could fit a generator, or a few soldered tubes, a seat and a handle bar. We need a handle bar to properly cycle.
this pedal powered generator can directly charge a 12V lead battery, it is the simplest solution
classic car lead battery
There the greenhouse itself, Ideally I would take a proper one with real glass, but it's too big an investment before being sure the concept works.
Concerning the LED system it looks like I need to have different kind of leds one to make the plants grow and another to get flowers.
A system to water the plant may be required, otherwise a human intervention is needed.
I don't think I will use hydroponics, but it remains an option.
I suppose a heating system is required to prevent the plants from freezing (and maybe to better simulate the summer)