Top 10 LDR based Electronics Projects

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There are many Electronics projects which use LDRs as their main driver of the circuit. In the list below, we list the top 10 LDR-based Electronics Projects.

LDR (Light Dependent Resistor) is a special type of resistor that works on the photoconductivity principle means that resistance changes according to the intensity of light.

The details about LDRs and their fundamentals are discussed in this article on What is LDR?

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The list starts from below:

Automatic Curtain Operation Using LDR

Circuit for Automatic Curtain Operation LDR based Electronics Projects
Circuit for Automatic Curtain Operation Using LDR

It does the task of folding and unfolding the curtain as per the light intensity outside the window. It is an automatic process and the light intensity is sensed by LDR in the circuit.

You can read the full project here: Automatic Curtain Operation Using LDR

LDR Plus GSM Based Security System

This project will teach us how to make a smart device that can notify us whenever any unauthorized person opens the safe box/drawer.

LDR Plus GSM Based Security System Prototype
LDR Plus GSM Based Security System Prototype

You can read the full project here: LDR Plus GSM Based Security System

LDR-Based DC Motor Speed Control

A light-dependent resistor (LDR) whose resistance is inversely proportional to the intensity of light is often used as a sensor in electronic projects that involve the use of light. This LDR-based DC motor speed control project uses an LDR to control the speed of a DC motor.

DC motor speed control LDR based Electronics Projects
Fig. 1: Author’s prototype of the DC motor speed control

You can read the full project here: LDR Based DC Motor Speed Control

How to Play With Light Using LDR

smart bulb holder circuit
How to Play With Light Using LDR circuit

Smart bulb holder is an incandescent, compact fluorescent or LED light bulb holder with a simple dusk-to-dawn/twilight controller circuit.

You can read the full project here: How to Play With Light Using LDR

Light Operated Doorbell

Here is a simple light-operated switch that you can affix to the main door of your house to work as an automatic doorbell or a thief alarm.

You can read the full project here: Light Operated Doorbell

Fan on/off Control by Light

This circuit lets you turn on/off a fan by just directing torchlight or other light toward its light-dependent resistor (LDR). The circuit is powered from a 5V power supply.

 

Fan on/off Control by Light LDR based Electronics Projects
Fan on/off Control by Light circuit

You can read the full project here: Fan on/off Control by Light

LED As Light Sensor

A simple circuit construction that uses a transparent red LED as the light sensor that switches on a white LED when the red LED is in dark.

 

LED As Light Sensor circuit
LED As Light Sensor circuit

You can read the full project here: LED As Light Sensor

Light Operated Internal Door Latch

Using this light-operated door latch circuit, you can close or open the door of your room remotely from your bed. You just have to focus the torchlight on the light-dependent resistor of the circuit, which you can install inside your room at a suitable position.

You can read the full project here: Light Operated Internal Door Latch

Door Guard

This door guard uses an operational amplifier µA741 and a light-dependent resistor (LDR). Operational amplifier µA741 is used as a sensitive voltage comparator.

You can read the full project here: Door Guard

Automatic Night Lamp With Morning Alarm

This automatic night lamp circuit turns on a night lamp when bedroom light is switched off. The lamp remains ‘on’ until the light sensor senses daylight in the morning.

You can read the full project here: Automatic Night Lamp With Morning Alarm


We compiled this list of LDR-based Electronics Projects ideas for you. We always welcome new and interesting professional or simple electronics projects students love to share with us. You can email us your project ideas at [email protected]

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