sparkfun_sik_006_photo_resistor by fmorton

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In experiment 2, you got to use a potentiometer, which varies resistance based on the twisting of a knob. In this circuit, you’ll be using a photoresistor, which changes resistance based on how much light the sensor receives. Since the RedBoard and Arduino Uno R3 can’t directly interpret resistance (rather, it reads voltage), we need to use a voltage divider to use our photoresistor. This voltage divider will output a high voltage when it is getting a lot of light and a low voltage when little or no light is present. [Experiment 6: Reading a Photoresistor](https://learn.sparkfun.com/tutorials/sik-experiment-guide-for-arduino---v32/experiment-6-reading-a-photoresistor)