Light Dependent Resistor
An LDR is a two pin device whose resistance decreases with the intensity of light falling on it.
Record 50Hz fluctuations caused by flourescent lighting
Set up the device in a room with flourescent lighting, and observe that the plot fluctuates slightly. Zoom in along the vertical axis by scrolling on the yaxis at the level of the plot
Now pause the data updates, and use the crosshairs to calculate the time period of the fluctuations. Confirm that they correspond to the power line frequency.
Testing with a flickering LED
Repeat the same with an LED connected between SQR1 and GND. Set the frequency , and point it towards the LDR.
Measure the time period again, and confirm that it corresponds to the frequency of SQR1 that was set
Screenshot
