LDR SENSOR

SPECIFICATION

• Temperature range: -40°C to 85°C
• Reference voltage : 1.65V
• Frequency: 400kHz
• Voltage: +3.3
• Inputs: light
• Outputs: analog signal

DESCRIPTION

A simple Light Sensor available today is the Light Dependent Resistor or LDR. The property of LDR is that its resistance is inversely proportional to the intensity of the ambient light i.e., when the intensity of light increases, its resistance decreases and vise-versa.

By using LDR is a circuit, we can calibrate the changes in its resistance to measure the intensity of Light. There are two other Light Sensors (or Photo Sensors) which are often used in complex electronic system design. They are Photo Diode and Photo Transistor.

Applicable for

• Camera Exposure control
• Photocopy machines – the density of the toner
• Colorimetric Test Equipment
• Densitometer
• Electronics scales – dual cell 
• Automatic gain control – modulated light source