Lesson: 20 - How to Interface an LDR (Photoresistor) with Arduino | Step-by-Step Guide
Lesson: 20 - How to Interface an LDR (Photoresistor) with Arduino | Step-by-Step Guide
Hello and welcome to Electro Nerds Academy! In today’s tutorial, we’ll learn how to interface a photoresistor (LDR – Light Dependent Resistor) with an Arduino to automatically control the brightness of an LED based on ambient light levels.
We’ll start by understanding how a photoresistor works — how its resistance changes with light intensity, and how this property can be used in a simple voltage divider circuit to measure light levels.
What You’ll learn:
✅ What an LDR (photoresistor) is and how it works
✅ The concept of voltage divider circuits
✅ How to read analog signals from the LDR using Arduino
✅ How to use the map() function to convert analog values into PWM signals
✅ How to control LED brightness automatically depending on surrounding light
Arduino Code Used in the Video:
int sensor_value;
int PWM_value;
void setup()
{
pinMode(3, OUTPUT);
pinMode(A0, INPUT);
}
void loop()
{
sensor_value = analogRead(A0);
PWM_value = map(sensor_value, 0, 1023, 0, 255);
analogWrite(3, PWM_value);
delay(500);
}
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