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Campers built a self-powered flashlight, turning a hand crank into enough electricity to light an LED.

Project Spotlight:

Hand Crank Flashlight

Turn physical motion into pure electric power! Build a battery-free, hand-cranked flashlight from scratch and discover the engineering secrets of generators and gears.

What We Built

Makers constructed a self-powered flashlight by wiring an LED to a hand-cranked generator. Using laser-cut, 3D printed, and electronic components, they assembled a sturdy housing to align the gears and protect the electronics.

Handcrank (2)

What We Built

Turning physical motion into electric power, campers wired an LED to a hand-cranked generator, then built a wooden housing to hold it all together.

 

What We Learned

Energy Conversion

How power is generated.

Gear Ratios

Different gear sizes affect speed and torque to optimize mechanical power.

Hands-on Assembly

Practiced precision woodworking and circuitry skills

Skills in Action

  • Circuitry
  • Gear Manipulation
  • Problem Solving

Build Story

Challenge — Generate enough power to light an LED by hand.

Process — Assemble gears and a generator into a housing.

Result — A fully functional, battery-free flashlight.

How We Kept it Safe

  • Adult-supervised soldering
  • 1 instructor per 4 campers
  • Safety glasses at every station
  • Tool check before + after

Photo Gallery

Handcrank (3)
Handcrank (4)
Handcrank (5)
Handcrank (6)
Handcrank (1)
Hand Crank 1

Ask Your Child

  • How did spinning the crank make the light turn on?
  • Why do we need gears inside the flashlight?
  • Where else do you see gear ratios in the real world?

Extend at Home

Explore gear ratios on your bike, or play “Gear Hunt” at home! Find items like egg beaters or clocks, then guess if their gears prioritize speed or power. 

Post Build Follow Up

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