Published June 26, 2022

Arduino DIY LED Control with LDR Sensor (Photoresistor)

This example demonstrates how to use an LDR (Light Dependent Resistor) darkness LDR, the LED is turned on/off.

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Arduino DIY LED Control with LDR Sensor (Photoresistor)

Things used in this project

Hardware components

Arduino UNO

LDR, 5 Mohm

LED, Blue

Resistor 1k ohm

Breadboard (generic)

Jumper wires (generic)

Software apps and online services

Arduino IDE

Story

Connect me on

Below is a video that goes through all the steps to assembling and running the Arduino Potentiometer Value Display on LCD 16x2 Look the Demonstration video HERE

Youtube

Hackster

Arduino

Introduction

In this project I am going to demonstrate how to Control LED through LDR.

This project will involve using a little a bit of code and a very simple circuit that’s great for beginners.The video further down this page will go through all the steps to completing this very cool Arduino DIY LED Control with LDR Sensor (Photoresistor)

This project aims to show how to control appliances when darkness appear like smart bulb.

This will serve as a base to build more amazing projects.In every electronic project we must think about what the input and output devices to use, the LDR is one of the best known and cheapest, we use the analog input reading due to the interaction of the project with the environment, along with this We must give importance to the output or presentation of the value

Working on Basics

The LDR and LED have been powered by Arduino UNO (Board). It contains a code which uploaded to the board. And once it simulated you can see When LDR catches darkness it will send input to Board and board will pass power to the LED.

We will use an Blue LED in this tutorial and we will need one LDR, to get readings.

The Arduino uses an analog pin to read the sensor values. So the potentiometer we want to read will connect it to the analog pin of the Arduino.

Refer to this video there is full instruction CLICK HERE

Usage

There is Multiple Usage of this Product:-

You can came to know how to interface with LDR

If you are a beginner than this is very useful for them to get interface with Input/Output Devices

You can check the Darkness Level value of LDR on Serial Monitor.

You can control many Appliances.

You can build up Many Smart Appliances for daily routine like Smart Bulb for the time when Darkness appear to start glowing automatically

Prototype Image's

1 / 4

Hookup

Connection of LED

Connect to Long Pin (+5V Pin) of LED to (Pin 12) of Arduino

Connect to Small Pin (GND Pin) of LED to (GND) of Arduino

Connection of LDR

Connect LDR (Any One Pin) to (+5V) Of Arduino

Connect 1K Resistor to Another Pin OF LDR and Connect Resistor Pin to GND of Arduino

Connect Ldr 2 Pin To A0 Of Arduino

Working of the Circuit

Basically when there is darkness the led will glow and when there is sufficient light led will stop glowing. This a simple circuit for of interface Arduino uno with LDR sensor.

First of all we need to knw what is LDR sensor and how it works ?

LDR ( light dependent resistor ) also called photoresistors are responsive to light. Photoresistors are used to indicate the intensity or the presence or the absence of light. When there is darkness the resistance of photoresistor increases and when there is sufficient light it dramatically decreases.

LDR ( light dependent resistor ) which has two terminals. Terminal one is the signal pin which should be connected according to the code. Another terminal is considered as the ground pin which should be connected to the ground of the system.

In the simplest terms, a light-emitting diode (LED) is a semiconductor device that emits light when an electric current is passed through it. Light is produced when the particles that carry the current (known as electrons and holes) combine together within the semiconductor material. Led has two terminals : positive and negative.

Watch the Demonstration Video

Complete Video

CLICK HERE

Shorts

CLICKHERE

Code

Code

/*Inventor DIY Inventor (Krishna Agarwal)
Desingner DIY Inventor (Krishna Agarwal)
Codder DIY Inventor (Krishna Agarwal)
*/

//set pin numbers
//const won't change
const int ledPin = 12;   //the number of the LED pin
const int ldrPin = A0;  //the number of the LDR pin


void setup() {

  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);  //initialize the LED pin as an output
  pinMode(ldrPin, INPUT);   //initialize the LDR pin as an input
}

void loop() {
  int ldrStatus = analogRead(ldrPin);   //read the status of the LDR value

  //check if the LDR status is <= 500
  //if it is, the LED is HIGH
Serial.println(ldrStatus);
/*Inventor DIY Inventor (Krishna Agarwal)
Desingner DIY Inventor (Krishna Agarwal)
Codder DIY Inventor (Krishna Agarwal)
*/
   if (ldrStatus <=80) {

    digitalWrite(ledPin, HIGH);               //turn LED on

   }
  else {

    digitalWrite(ledPin, LOW);          //turn LED off
  }
}

Credits

DIY Inventor

0 projects • 19 followers

Hello Guys, My name is Krishna Agarwal , and I'm passionate about Making DIY Projects. Here I make Arduino and Robotics related projects.

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Arduino DIY LED Control with LDR Sensor (Photoresistor)

Things used in this project

Hardware components

Software apps and online services

Story

Connect me on

Introduction

Working on Basics

Usage

Prototype Image's

Hookup

Working of the Circuit

Watch the Demonstration Video

Schematics

Circuit Diagram

Code

Code

Credits

DIY Inventor

Comments

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Arduino DIY LED Control with LDR Sensor (Photoresistor)

Arduino DIY LED Control with LDR Sensor (Photoresistor)

Things used in this project

Hardware components

Software apps and online services

Story

Connect me on

Introduction

Working on Basics

Usage

Prototype Image's

Hookup

Working of the Circuit

Watch the Demonstration Video

Schematics

Circuit Diagram

Code

Code

Credits

DIY Inventor

Comments

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