Arduino Project

Arduino Photoresistor (LDR) Tutorial: Measure Light Intensity

Kit purchase

Looking for parts? Check out our all-in-one kits below — packed with components, beginner-friendly guides, and tons of fun.

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Name	Includes Arduino board	PURCHASE LINK
Elite Explorer Kit	Arduino Uno R4 WiFi	BUY
3 in 1 Ultimate Starter Kit	Arduino Uno R4 Minima	BUY

Course Introduction

In this lesson, we will learn how to use the Photoresistor module with Arduino.

Note

If this is your first time working with an Arduino project, we recommend downloading and reviewing the basic materials first.

1.1 Install Arduino IDE(Important)
1.2 Introduction of Arduino IDE

Required Components

In this project, we need the following components:

SN	COMPONENT INTRODUCTION	QUANTITY	PURCHASE LINK
1	Arduino UNO R4 WIFI	1	BUY
2	USB Type-C cable	1	×
3	Breadboard	1	BUY
4	Wires	Several	BUY
5	Photoresistor Module	1	BUY

Wiring

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Common Connections:

Photoresistor Module
A0: Connect to A0 on the Arduino.
GND: Connect to breadboard’s negative power bus.
VCC: Connect to breadboard’s red power bus.

Writing the Code

Note
You can copy this code into Arduino IDE.
Don’t forget to select the board(Arduino UNO R4) and the correct port before clicking the Upload button.

  /*
  This Arduino code reads and displays the analog value from
  a photoresistance sensor connected to an Arduino Uno. It
  continuously measures the light intensity detected by the
  sensor and outputs the readings to the serial monitor.

  Board: Arduino Uno R3 (or R4)
  Component: Photoresistance Sensor Module
*/

// Photoresistor analog input pin
const int sensorPin = A0;

void setup() {
  Serial.begin(9600);  // Initialize serial communication
}

void loop() {
  Serial.println(analogRead(sensorPin));    // Read the sensor value and send it to Serial Monitor
  delay(50);    // Sampling interval
}

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Arduino Project

Arduino Photoresistor (LDR) Tutorial: Measure Light Intensity

Kit purchase

Course Introduction

Required Components

Wiring

Common Connections:

Writing the Code

Arduino Project

Arduino Photoresistor (LDR) Tutorial: Measure Light Intensity

Kit purchase

Course Introduction

Required Components

Wiring

Common Connections:

Writing the Code

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