ACTIVATE BUZZER AND LED BY USING LDR SENSOR
Guide: Dr. V Siva Nagaraju, Professor, ECE & IARE Yaragani Sravanthi, Dasari Pravalika
Department of Electronics & Communication Engineering
Institute of Aeronautical Engineering, Hyderabad, Telangana, India
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Abstract:
This project aims to design a simple circuit system that uses a Light Dependent Resistor (LDR) to activate a buzzer and blink an LED when light falls on the LDR. The LDR, a photosensitive device, responds to changes in light intensity, making it an ideal sensor for light-based activation systems.
The working principle is based on the LDR's property where its resistance decreases as light intensity increases. When light falls on the LDR, the reduced resistance causes a change in the circuit's voltage. This change is used to trigger the activation of a buzzer and LED. The LED blinks continuously while the buzzer provides an audible alert. A microcontroller or comparator circuit can be used to process the signal and control the output devices effectively.
This project is suitable for applications such as light- activated alarms, object detection systems, and automation systems. It is designed to be cost-effective, energy-efficient, and easy to implement, making it a practical solution for real-world scenarios. The system demonstrates the seamless integration of sensors and basic electronics to achieve automated responses to environmental changes.
This project explores the design and implementation of an automated system that uses a Light Dependent Resistor (LDR) sensor to control the activation of a buzzer and the blinking of an LED. The primary objective of the system is to automatically trigger a sound alarm (buzzer) and visual signal (LED blinking) when light falls on the LDR sensor, enabling real-time detection and response to environmental light changes. The Light Dependent Resistor (LDR) is a type of resistor whose resistance decreases with the increase in light intensity. In the absence of light, the LDR has high resistance, while in the presence of light, its resistance significantly drops. This variation in resistance is used to control the circuit's behavior.
Key Words: LED, Light Sensing , Circuit Design, Security Systems, Light-Based Triggering, Environmental Monitoring, Alert System, Sensor Activation
