Paper Space War

Project Number: 21

Parts Needed For Circuit: Piece Of Paper With Lots Of Dark Areas On It (Not Included)

OBJECTIVE: To give a more dramatic demonstration of using the photoresistor.

Description: Use the same circuit as for Project #20. Find a piece of white paper that has a lot of large black or dark areas on it, and slowly slide it over the photosensitive resistor. You should hear the sound pattern constantly changing, as the white and dark areas of the paper control the light to the photosensitive resistance. You can also try the pattern below or something similar to it: