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LDR LIGHT SENSOR

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LDR(Light Dependent Resistor) also known as photoresistor is a resistor whose resistance varies with the amount of light falling on it.

Normally the resistance of an LDR is very high, sometimes as high as 10Mohms, but when they are illuminated with light , resistance drops dramatically.

I
n other words, it exhibits photoconductivity. Photoelectric or light sensing device is used in almost any branch of industry for control,safety & amusement.

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