LDR Photoresistor Module

The LDR (Light Dependent Resistor) Photoresistor Module project demonstrates how to use an LDR with an Arduino Mega to measure ambient light intensity. The LDR's resistance changes based on the amount of light falling on it, which is then converted into a voltage by the Arduino's analog-to-digital converter (ADC). This project reads the analog voltage from the LDR and prints the light intensity values to the Serial Monitor.

Components Needed

• Arduino Mega
• LDR (Photoresistor)
• Resistor (optional for voltage divider)
• Jumper Wires
• Breadboard
• Power Supply

Block Diagram

Circuit Setup

Connect the LDR to Arduino Mega:

Instructions

Circuit Setup:

Connect the LDR module to the Arduino Mega as described in the circuit setup section.

Code Upload:

Open Arduino IDE and create a new sketch.

Copy and paste the provided Arduino code into the sketch.

Testing:

Upload the code to the Arduino Mega.

Open the Serial Monitor in Arduino IDE (set to 9600 baud).

Observe the Serial Monitor for the light intensity values printed as sensor readings.

Applications

Notes

Ensure the LDR is exposed to the light source you intend to measure.

Calibrate readings as needed based on environmental conditions and sensor placement.

Experiment with different resistors in the voltage divider to optimize sensitivity and range.