Description:

LDR (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 it’s 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.

Analog Applications:

• Camera exposure control
• Auto slide focus – dual cell
• Photocopy machines – the density of the toner
• Colorimetric test equipment
• Densitometer
• Electronics scales – dual cell
• Automatic gain control – modulated light source
• Automated rear view mirror

Digital Applications:

• Automatic headlight dimmer
• Nightlight control
• Oil burner flame out
• Streetlight control
• Absence/presence (beam breaker)
• Position sensor

Other applications:

• Annunciator
• Camera automatic photometry
• Electronic toy
• Industrial control
• Light control
• Light control lamp
• Photoelectric control
• Switch

Features:

• Coated with epoxy
• Good reliability
• High sensitivity
• Small volume
• Fast response
• Good spectrum characteristic
• Size: 20mm
• Max. voltage: 500 VDC
• Max. power: 500 mW
• Spectrum Peak Value (nm): 560
• Light resistance ( KΩ) : 10–20 kΩ
• Dark resistance ( KΩ): 2 kΩ.
• Υ value : 0.6.
• Increase response time: 30 mS.
• Decrease response time: 30 mS.

Package Includes:

1 x Photoresistor Light Sensitive 20mm LDR Sensor.