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→Part 2 - Light Sensor
** measure the "light" resistance of your photoresistor
** measure the "dark" resistance. (cover the resistor with your hand, or try shutting it in one of the lab cabinets)
[[Image:Photo_resistor_Symbol.png]] [[Image:Photoresistor_2.jpg]]
** Set up a voltage divider with the photoresistor and a 10K resistor. You can take your circuit from before and replace the potentiometer with the photoresistor. What range of output voltages can you get by covering or uncovering the photoelement?
[[Image:Photoresistor_v_out.png| 200px]]
=== Part 3 - Transistor Driver ===
* Get out your transistor. It should say "TIP 120" on the front of it.