Understanding Light Dependent Resistor with PSLab

Goal

To understand how the Light Dependent Resistor works and viewing voltage changing using the oscilloscope instrument.

Setting Up

1. Connect a 220 Ω resistor onto a breadboard

2. Connect the Light Dependent Resistor to the breadboard, making sure one of the legs of the LDR is in the same column as one of the legs of the resistor

3. Connect Jumper cables to each column with at least one leg as shown

4. Connect the other end of the Jumper Cable to the PSLab

5. Connect the PSLab to your Android phone using the USB OTG Cable

Interfacing with PSLab

6. Open the PSLab Android App, Tap on Oscilloscope

7. Turn on reading from Channel 1 by checking CH1

8. Change the range to +/- 8V to see the changes more clearly

9. Notice the line moving up or down when you expose the Light Dependent Resistor to bright light or darkness by covering it with your fingers.