A light dependent resistor (LDR) is a light sensitive device used to measure the intensity of light.
LDRs are special kinds of resistors that changes their resistance based on the intensity of light they receive.
LDR usually made from cadmium sulphide (cds) which is a photosensitive semiconductor material
What material is used to make LDR?
When it's bright, an LDR has low resistance – it lets electricity pass through easily. But when it's dark, the resistance is higher, meaning it resists the flow of electricity.
How light affects LDR?
LDR used in following applications: Automatic lights Photography Security system Solar panels Weather monitoring Street light control Automotive headlight, etc
Requires components:
Connection diagram:
This circuit connection will lightup the LED whenever the LDR senses the darkness with the help of Arduino Uno.