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Light Detection  


We will assemble the light sensor circuit on the circuit trainer.

  Materials / Main Page


Step 1:

  • Study the schematic diagram to determine how the parts are hooked together.
  • Refer to the materials pop up window to see the different components.

Experiment Schematic Diagram


Step 2:

  • Hook up the components on the circuit trainer.
  • Set the power supply to +9V DC.

Experiment Procedure


Step 3:

  • Plug in the circuit trainer and set the pontentiometer until the photoelectric cell reacts to the movement of your hand.
  • When the photoelectric cell is exposed to light, the LED should light, when you cover it with your hand, the LED should go out.
  • If you reverse pins 2 and 3 of the LM324, the light will go on when it is dark and go out when exposed to light.
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