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Read Article βLDR (Light Dependent Resistor) is a resistor whose resistance varies inversely with the amount of light falling on it. It is also known as photo resistor, photocell, photo conductive cell etc. LDR are available in 5mm, 8mm, 12mm and 25mm dimensions.
LDR is made of high resistance semiconductor material. Semiconductor material used for the photo resistors is cadmium sulphide, CdS. When itβs dark, LDR has high resistance known as dark resistance. Usually dark resistance will be in the range of mega ohms. When light falls on LDR, resistance reduce to kilo ohms range.
Working principle: when light falls on LDR i.e. when photons fall on LDR, valence band electrons get sufficient energy to get excited to the conduction band. Incident photons must have energy greater than the forbidden energy gap of the semiconductor. When light having enough energy falls on the device, more electrons will get excited to conduction band. As the number of free electrons increases, more current flows through the circuit. Hence it is said that, as light falls on LDR, resistance decreases.
Features:
Good Characteristic of Spectrum
Quick Response
Epoxy or hermetical package
Reliable Performance
Specifications:
Diameter : 8mm
No. of Pins : 2
Type of Mounting : PCB Through Hole
Maximum Operating Temperature : +800C (Approx.)
Dark resistance:1-20M ohm
Applications:
Burglar Alarms
Light Detectors
Light Sensor
Color Sensor
Line Sensor
OBJECT SENSOR
Photo Switch
Lighting Controls For Street Lamps
Light Intensity Meters
| LDR SIZE (mm) | 8 |
|---|
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Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
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