Arduino Uno Light Sensor (LDR)

Project Overview

This project demonstrates how to use a Light Dependent Resistor (LDR) with an Arduino Uno to measure light intensity. The analog value read from the LDR is displayed on the Arduino's serial monitor, providing a measure of ambient light levels.

Components Needed

• Arduino Uno
• Light Dependent Resistor (LDR)
• Resistors (if needed for LDR voltage divider)
• Jumper Wires
• Breadboard

Block diagram

Circuit Setup

1. Connect LDR to Arduino Uno:
   • Connect one leg of the LDR to 5V on the Arduino Uno.
   • Connect the other leg of the LDR to analog pin A0 on the Arduino Uno.
   • Optionally, use a resistor to create a voltage divider for accurate readings.

Instructions

1. Circuit Setup:

   • Ensure the LDR is correctly connected to the Arduino Uno as described in the circuit setup section.

2. Code Upload:

   • Open the Arduino IDE and create a new sketch.
   • Copy and paste the provided Arduino code into the sketch.

3. Testing:

   • Upload the code to the Arduino Uno.
   • Open the serial monitor with a baud rate of 9600.
   • Observe the light intensity values displayed, which correspond to the ambient light levels sensed by the LDR.

Applications

• Environmental Monitoring: Use for measuring light levels in indoor or outdoor environments.
• Automation: Implement in projects where light-dependent actions are required, such as automatic lighting systems.
• Education: Learn about analog sensors and interfacing with Arduino.

Notes

• Ensure the LDR is exposed to the ambient light conditions you intend to measure.
• Calibrate the system by adjusting the code or using additional circuit components as necessary.
• Experiment with different resistors for the voltage divider to optimize sensitivity and range of the LDR.

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