Engineer an Electronic Water Level Detector

Build an open circuit that completes when the water level drops below a certain level and/or goes above a certain level.

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Inspiration Video

Suggested Materials

Recommended
  • skewer or dowel
  • ping pong ball
  • bendy straws
  • aluminum foil
  • tape
  • jar or large container
  • jewelry box or small box (to hold the LEDs)
  • LEDs (two colors)
  • alligator clips with wires (4)
  • batteries (AAA or AA)
  • battery holder
Optional
  • wire
Testing Station
  • water

Difficulty Level

1
2
3

This design challenge may require complex motor skills, understanding of abstract concepts, or unusual materials to build.

This is the difficulty level for a typical 4th grade classroom. Modify as needed for other age groups.