Another type of resistor Light dependent resistor (LDR). LDR resistance changes with changes in light intensity about it. In the dark resistance of about 10MΩ LDR and in light of 1KΩ or less. LDR made from semiconductor materials such as cadmium sulfide. With this material the energy of the light that falls cause more load to the electric current is released or increased. This means that the material resistance has decreased. LDR is used to convert light energy into electrical energy. Automatic light switches and burglar alarms are a few examples of tools that use the LDR. However, because the response to light is slow, LDR is not used in situations where the intensity of light changed drastically.
Function light sensor for detecting the light that surrounds us. Sensor to detect light famous is LDR (Light Dependent Resistor). The sensor will change its resistance value when there is a change in light brightness.
These principles we will use to activate the transistor to a DC motor drive (similar to the dynamo in the toy cars children). Change the value of the LDR resistance will lead to changes in input voltage difference at the base of the transistor, so that will activate / disable transistors . Another application of this LDR sensor is in alarm Thief.
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