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Comparing the effectiveness of a light sensor and a touch sensorFeatured science projectScience project video

Observation

It is observed that the light sensor detected and counted all 100 boxes at all 3 different speeds. The touch sensor was effective in the beginning but as the speed of the conveyor belt increased, the friction between the boxes and the touch sensor slowed the movement of the boxes and caused a pile up on the conveyor belt.
 

Sensor Boxes counted at different speeds
  2 m/m 5 m/m 8 m/m
Light 100 100 100
Touch 100 95 77

Light sensor science fair project

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Complexity level:
8
Project cost ($):
50
Time required:
1 hour to prepare, 1 hour for observation
Material availability:
Sensors and electronic counters may be purchased from hobby stores. Access to a conveyor belt is required.
Safety concerns:

None