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Flash light

duration: 20 - 45 minutes

age: from 7 years

Make a working flashlight.

Flash light

tools

  • lasercutter
  • soldering iron
  • wire cutters

materials

  • wood (3mm thick)
  • 2x 5mm white LEDs
  • 2x 22 Ohm resistor
  • rubberband
  • woodglue
  • battery holder for 2 AA batteries
  • 2 xAA battery

downloads

step 1 - Cut the wood

  • Use the provided template to cut the wooden parts using the lasercutter.

step 2 - Solder the short legs

  • Use a piece of foam or some wood with holes in it to hold the LEDs while soldering.
  • Place the 2 LEDs with the short legs close to eachother.
  • Bend the short legs toward eachother. The bend should be about 5mm away from the LED body.
  • Solder the short legs together.

step 3 - Solder the long legs

  • Cut the long legs down to about 1cm
  • Cut one leg of each resistor down to about 1cm
  • Solder the short legs of the resistors to the shortened legs of the LEDs.
  • Bend the free legs of the resistor and solder them together.

step 4 - Attach the batteries

  • Solder the red wire of the battery holder to where the resistors are joined together.
  • Solder the black wire of the battery holder to where the LEDS are soldered together.
  • Put some batteries in the holder and test your light.

step 5 - Assemble the flashlight body

  • Start by glueing the bottom of the light together.
  • Slide the LEDs into the slit and place it in the front of the light.
  • Glue the rest of the wooden pieces in place.

step 6 - Finish up

  • Use the rubber band to hold the battery pack in place.
  • You're all done!