Sesitive Round Diameter 5mm Photocell Cds Photoresistor Light Sensor GM55 Series For Sensor Application

Sesitive Round Diameter 5mm Photocell Cds Photoresistor Light Sensor GM55 Series For Sensor Application

Description 

Ao littel photoresistor Light Sensor or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity. A photoresistor Light Sensor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits. It's also called light-dependent resistor (LDR).

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Photocells Light Sensor are sensors that allow you to detect light. They are small, inexpensive, low-power,easy to use and don't wear out. For that reason they often appear in toys, gadgets and appliances. They are often referred to as CdS cells (they are made of Cadmium-Sulfide), lightdependent resistors (LDR), and photoresistors.

Dimension (mm)

Features

Good reliability

Small volume

High sensitivity

Quick response

Good spectrum characteristic

Epoxy encapsulated

Reliable performance

Application

Camera automatically metering

Photoelectric control

Interior light control

Alarm industrial control

Light-controlled switch

Light-controlled light

Electronic toys.

Specification

What the Heck is Lux ?

Most datasheets use lux to indicate the resistance at certain light levels.
But what is lux ? Its not a method we tend to use to describe brightness so its tough to gauge. Here is a table adapted from a Wikipedia article on the topic! 

Testing a Photoresistor Light Sensor

The easiest way to determine how your photoresistor works is to connect a multimeter in resistance-measurement mode to the two leads and see how the resistance changes when shading the sensor with your hand, turning off lights, etc. Because the resistance changes a lot, an auto-ranging meter works well here. Otherwise, just make sure you try different ranges, between 1MΩ and 1KΩ before 'giving up'.

Connecting a Photoresistor Light Sensor

1)Because photoresistor Light Sensor are basically resistors, they are non-polarized. That means you can connect them up 'either way' and they'll work just fine!

2)Photoresistor Light Sensor are pretty hardy, you can easily solder to them, clip the leads, plug them into breadboards, use alligator clips, etc. The only care you should take is to avoid bending the leads right at the epoxied sensor, as they could break off if flexed too often.