LDR stands for the light-dependent resistor or a photoresistor is basically a resistor whose resistance decreases with an increase in incident light intensity(photoconductivity).
A photoresistor is made up of high resistance semiconductor material. If the light falling on the LDR is of high enough frequency and energy density photons get absorbed by the semiconductor give?s band electrons enough energy to jump to the conduction resulting in free-electron conduct electricity lowering resistance.
<p>LDR is made of Semiconductor materials with high Resistance like Silicon or Germanium. It is a light-sensitive device so this resistor has a different resistance value in day and night as given below
It requires less power to operate
Easy to use
Generate high current
Miniature open frame package.
Spectral response is similar to the human eye
Operating temperature: -30?C ~ +70?C
Response time: 20ms (Rise) 30ms (Down)
Camera Exposure Control
Colorimetric Test Equipment
Automatic Gain Control
Automated Rear View Mirror
Automatic Headlight Dimmer
Night Light Control
Oil Burner Flame Out
Street Light Control
Auto Slide Focus ? dual cell
Photocopy Machines ? density of toner
Electronic Scales ? dual cell
Max power dissipation 200mW
Max voltage at 0 lux 250V
Peak wavelength 560nm
Min. resistance at 10lux~10k?
Max. resistance at 10lux~20k?
Typ. resistance at 100lux~1k? ? 5k?
(Dark) resistance after 1 sec~1.7M?
(Dark) resistance after 5 sec ~2M?
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