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A photocell (also light-dependent resistor, photoresistor or photoconductor) is a variable resistor whose value decreases with increasing incident light intensity. In this project, an LED is controlled by a photocell (for example: the LED could be turned on and off depending on ambient light).
Use a photocell (R1), a 1K resistor (R2), a resistor with a resistance equal to the resistance of the photocell in your normal ambient light conditions (R3), an LED, and a 220 Ohm resistor (R4). You will need a multimeter to measure the resistance of the photocell.
Created on April 9, 2009, 20:15