Description: LDR 5mm Photoresistor Light Dependent Resistor LDR

LDR 5mm Diameter Photoresistor Photo Cell Light Dependent Resistor LDR Sensor For Night Light Street Light Sensor Automatic Headlight Dimmer Control Photo Light Sensitive Resistor

This is a very small light sensor. A photocell changes (also called a photodetector, photo resistor, CdS or photoconductive cell) resistance depending on the amount of light it is exposed to. These little sensors make great ambient light triggers (when light in the room turns on, do something)

A light dependent resistor works on the principle of photo conductivity. Photo conductivity is an optical phenomenon in which the materials conductivity is increased when light is absorbed by the material. When light falls i.e. when the photons fall on the device, the electrons in the valence band of the semiconductor material are excited to the conduction band. These photons in the incident light should have energy greater than the band gap of the semiconductor material to make the electrons jump from the valence band to the conduction band. Hence when light having enough energy strikes on the device, more and more electrons are excited to the conduction band which results in large number of charge carriers. The result of this process is more and more current starts flowing through the device when the circuit is closed and hence it is said that the resistance of the device has been decreased. This is the most common working principle of LDR.

Specification:

It requires less power to operate

Quick Response

Easy to use

Generate high current

Maximum Voltage (V-dc): 150V

Maximum Power Consumption (mW): 100W

Temperature (°C): -30 – +70°C

Spectrum Peak Value (nm): 540 OD

The limit test parameters:

Bright Resistance (10Lux) (KΩ): < 45

Dark Resistance (MΩ): > 200

Application parameters reference value:

Light resistance: < 8 k

Dark resistance: > 20 megohm

100¦Ë10: 0.6

Response Time (ms): Up: 20/ Down: 30

Light Resistance Characteristic: 3

The length of the pins: > 2.5 CM/0.98″

Material: Carbon

Performance: General

Shape: cylindrical

Applications: burglar alarm circuit

Size: 5mm

Applications:

Camera Exposure Control

Auto Slide Focus

Photocopy Machines

Colorimetric Test Equipment

Densitometer

Electronic Scales

Automatic Gain Control

Automated Rear View Mirror

Automatic Headlight Dimmer

Night Light Control

Oil Burner Flame Out

Street Light Control

Absence / Presence (beam breaker)

Position Sensor

Package include:

5 x LDR 5mm Diameter Photoresistor Photo Cell Light Dependent Resistor LDR Sensor For Night Light Street Light Sensor Automatic Headlight Dimmer Control Photo Light Sensitive Resistor For Electronics Projects