Project 12: Photo Resistor - Keyestudio ARDUINO maker learning kit Manual

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Project 12: Photo resistor

Introduction
After completing all the previous experiments, we acquired some basic understanding and
knowledge about Arduino application. We have learned digital input and output, analog input and
PWM. Now, we can begin the learning of sensors applications.
Photo resistor (Photovaristor) is a resistor whose resistance varies according to
different incident light strength. It's made based on the photoelectric effect of semiconductor. If
the incident light is intense, its resistance reduces; if the incident light is weak, the resistance
increases. Photovaristor is commonly applied in the measurement of light, light control and
photovoltaic conversion (convert the change of light into the change of electricity).
Photo resistor is also being widely applied to various light control circuit, such as light control and
adjustment, optical switches etc.
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