Light Dependent Resistor (LDR) - Working Principle and Its Applications

 

ldr applications ppt

Jan 30,  · clinical applications of LDR-HDR brachytheray Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. Mar 04,  · CHARACTERISTICS OF LDR LDRs are light dependent devices whose resistance decreases when light falls on them and increases in the dark. When a light dependent resistor is kept in dark, its resistance is very high. The LDR is a device which is made up of high resistance semiconductor material. Some of the applications of LDR are street lights, clock radios, light alarm, reflective smoke alarm, outdoor clocks, and camera light meters. In this article, we will discuss the working & construction of light dependent resistor. What is a Light Dependent Resistor?Author: Tarun Agarwal.


Know about Different Types of Sensors with their Applications


In our day-to-day life we fre quently use different types of sensors in several applications such as IR sensor used for operating television remote, Passive Infrared sensor used for automatic door opening system of shopping malls ldr applications ppt LDR sensor used for outdoor lighting or street lighting system, and so on. In this article we will discuss about a few types of sensors and their applications in brief.

But, primarily we must know what is a sensor. A device that detects the changes in electrical or physical or other quantities and thereby produces an output as an acknowledgement of change in the quantity is called as a Sensor. Generally, this sensor output will be in the form of electrical or optical signal. The most frequently used different types of sensors are classified based on the quantities such as Electric current or Potential or Magnetic or Radio sensors, Humidity sensor, Fluid velocity or Flow sensors, Pressure sensors, ldr applications ppt, Thermal or Heat or Temperature sensors, Proximity sensors, Optical sensors, ldr applications ppt, Position sensors, ldr applications ppt, Chemical sensor, Environment sensor, Magnetic switch sensorldr applications ppt, etc.

Typical applications of different types of sensors such as application of Speed sensor for synchronizing the speed of multiple motors, Temperature sensor application for industrial temperature control, application of the PIR sensor for automatic-door-opening system, Ultrasonic sensor application for distance measurement, etc, ldr applications ppt.

Sensors used for detecting speed of an object or vehicle is called as Ldr applications ppt sensor. There are different types of sensors to detect the speed such as Wheel speed sensors, speedometers, LIDAR, ground speed radar, pitometer logs, doppler radar, air speed indicators, pitot tubes and so on.

PIC microcontroller based project for speed synchronization of multiple motors in industries using wireless technology is a typical application of the speed sensor. The main motor and receiver motors used in this project are BLDC motors that are controlled using PWM control with the radio frequency wireless communication mode, ldr applications ppt.

Full speed will be displayed on display unit and required speed of all ldr applications ppt can be obtained by entering the ldr applications ppt percentage using the keypad.

This entered percentage is matched with running RPM by maintaining appropriate DC power to motor with automatic adjustment of pulse width output of microcontroller. A device which gives temperature measurement as an electrical signal is called as Temperature sensor. This electrical signal will be in the form of electrical voltage and is proportional to the temperature measurement.

There are different types of sensors used for measuring temperature, such as Ldr applications ppt type temperature sensors, Non-contact type temperature sensors.

These are again subdivided as Mechanical temperature sensors like Thermometer and Bimetal. Electrical temperature sensors like Thermistor, Thermocouple, Resistance thermometer and Silicon band gap temperature sensor. Design of Industrial Temperature Controller for controlling temperature of devices used in industrial applications is one of the frequently used practical applications of the temperature sensor.

In this circuit IC DS, ldr applications ppt, a digital thermometer is used as a temperature sensor, thermostat, which provides 9-bit temperature readings. An electronic sensor used for measuring the infrared light radiation emitted from objects in its field of view is called as a PIR sensor or Pyroelectric sensor.

Every object that has a temperature above absolute zero emit heat energy in the form of radiation radiating at infrared wavelengths which is invisible to the human eye, but can be detected by special purpose electronic devices such as PIR motion detectors.

PIR sensor itself is split into two halves, which are sensitive to IR and whenever object comes in the field of view of ldr applications ppt sensor, then positive differential change will be produced between two halves with the interception of the first half of the PIR sensor.

Similarly, if the object leaves the field of view, then negative differential change will be produced. There are different types of sensors used for detecting the motion and these PIR sensors are classified based on angle wide ldr applications ppt over which they can detect motion of the objects like degrees, degrees and degress angles.

Automatic Door Opening System is a typical application of PIR sensors which is intended for automatic door closing and opening operations based on body movement near the door. PIR-sensor-based-automatic-door- opening system circuit mainly consists of a PIR sensor, an micrcontroller, a driver IC, a door motor. If a body movement is present near the door, ldr applications ppt, then infrared radiation emitted from the body will cause the sensor to produce sensing signal which is fed to microcontroller.

The door motor is then controlled and operated by the microcontroller through driver IC. This project is intended for operating doors of shopping malls, theatres and hotels. The transducer used for converting energy into ultrasound or sound waves with ranges above human hearing range is called an ultrasonic transducer.

The distance measurement at inaccessible areas is a typical application of ultrasonic ldr applications ppt. The circuit consists of an ultrasonic module, LCD display and microcontroller.

The ultrasonic module is ldr applications ppt with the microcontroller and this ldr applications ppt transducer consists of a transmitter and receiver. The waves transmitted by transducer are received back again after the waves are reflected back from the object. The velocity of sound is considered for calculating time taken for sending and receiving waves, ldr applications ppt. The distance is calculated by executing a program on microcontroller, and then ldr applications ppt is displayed on the LCD display.

There are many sensors such as humidity sensor, gas sensor, pressure sensor, water sensor, leaf sensor, rain sensor, tilt sensor, rate sensor and so on, which are being used in many applications. If you are interested to know in detail about sensors, then you can approach us for any technical help regarding different types of sensors and their applications and also to develop sensor based projects by posting your queries in comments section below.

Your email address will not be published. What is a Sensor? Different types of Sensors The most frequently used different types of sensors are classified based on the quantities such as Electric current or Potential or Magnetic or Radio sensors, Humidity sensor, Fluid velocity or Flow sensors, Pressure sensors, Thermal or Heat or Temperature sensors, Proximity sensors, Optical sensors, Position sensors, Chemical sensor, Environment sensor, Magnetic switch sensoretc.

Different types of Sensors. Speed Sensor. Application of Speed Sensor. Temperature Sensor. Temperature Sensor Application. Passive Infrared Sensor. PIR Sensor Application. Ultrasonic Sensor Application. Leave a Reply Cancel reply Your email address will not be published.

 

Light Dependent Resistor

 

ldr applications ppt

 

The LDR is a device which is made up of high resistance semiconductor material. Some of the applications of LDR are street lights, clock radios, light alarm, reflective smoke alarm, outdoor clocks, and camera light meters. In this article, we will discuss the working & construction of light dependent resistor. What is a Light Dependent Resistor?Author: Tarun Agarwal. Jan 30,  · clinical applications of LDR-HDR brachytheray Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. Nov 12,  · Light Dependent resistor Light Dependent resistor is a electronic component, with variable resistance which varies with the light intensity that falls on surface. LDR resistance decreases with intensity of light incidenting upon it. The resistance.