industrial automaton
depending upon the lighting heat
ldr sensor
Smoke Detectors use things called LDR's or Light Dependent Resistors which lose resistance with an increase in natural light. So when there is a fire, smoke blocks out the natural light, alarming the smoke detector with an increase in resistance. Once the smoke is gone the resistance decreases and a current is allowed to flow to shut down the smoke detectors alarm. :)
The symbol for Light-Dependent Resistor (LDR) is a resistor symbol with photo-sensitive material added to one side. It looks like a regular resistor with one side having a shaded area to represent its light sensitivity.
The resistance of LDR increases when light is not available (or is limited). And the resistance drops when Light is abundant.This principle can be used in proximity detectors where one or more light source(s) is/are active. When a person / object comes in proximity of the source, the light gets reflected from the object-surface & can now be received by LDR. So due to proximity of the object, resistance of LDR changes - this can be used to trigger different actions like open the door, trigger a motor. Fire an alarm. etc.Resistance of LDR varies according to intensity of incident light over it,It is used in street light to detect day/night and turn on/off the street light automatically
An LDR is a Light dependent resistor.
LDR refers to Light Dependent Resistor.
Light Dependent Resistor LDR also means long distance relationship.
The symbol for LDR Holding Corporation in NASDAQ is: LDRH.
LDR Holding Corporation (LDRH) had its IPO in 2013.
When LDR is exposed to light energy . Due to light energy incident on LDR surface, free electron movement of an atom is increased in LDR. This causes high conduction of curent flowing through LDR. beause of free electron movement in LDR, resitance get decreased.