Arduino Project 4- LDR and Buzzer Experiment

In this project, we will learn to experiment with LDR and a buzzer. The output of this experiment is sound with different frequencies that are produced depending upon the light falling on the LDR/photoresistor.

– Connect the negative black wire of the buzzer to pin GROUND and the black positive to the digital pin 9.
– Connect to pin 5V a resistor of 1 kΩ and the other end of it a photoresistor and pin A0.
– Connect the other lead of the resistor pin GROUND.

List of components:

Name Quantity Component
R1 1 1 kΩ Resistor
PIEZO1 1 Buzzer [Piezo small]
R2 1 Photoresistor
U1 1 Arduino Uno R3


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