As a home project I want to make a electricity generator which uses a spring coil, which when turned/wound(just like the mechanism in wrist watches) enough times will start unwinding and generate power small/large enough to power a small bulb/ night light / LED.

The entire assembly should be handy/easy to carry around.

Can you guys give some ideas? some online DIY project reference ?

Pls feel free to add/remove relevant/irrelevant tags.

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    \$\begingroup\$ First figure out how much energy you can store in that spring. Then, figure out how much energy you need to run a small bulb/night light/LED. Then dismay as you realize that the latter is much larger than the former. \$\endgroup\$ – Ignacio Vazquez-Abrams Dec 9 '16 at 4:02
  • \$\begingroup\$ @IgnacioVazquez-Abrams, thanx for reply, I was very impressed by this en.wikipedia.org/wiki/Mechanically_powered_flashlight \$\endgroup\$ – Vikram Dec 9 '16 at 4:04
  • \$\begingroup\$ The problem isn't putting in the required energy. That problem was solved a very, very long time ago. The issue is trying to store it in a spring. \$\endgroup\$ – Ignacio Vazquez-Abrams Dec 9 '16 at 4:07
  • \$\begingroup\$ Tri state Led powered by a stepper motor, with a speed control spun by a spring. It may run down in a very short time, like an alarm on a wind up clock. \$\endgroup\$ – Optionparty Dec 9 '16 at 5:30
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    \$\begingroup\$ Look up clockwork generator on Google and read the following. There are lots of examples. - en.wikipedia.org/wiki/Human_power#Windup_radio \$\endgroup\$ – KalleMP Dec 9 '16 at 9:04

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