This property of the decrease in resistance for the LDR is achieved because it is a property of semiconductor material used on the surface. Now what this principle says is, whenever light falls on the surface of the LDR (in this case) the conductance of the element increases or in other words, the resistance of the LDR falls when the light falls on the surface of the LDR. These LDRs or PHOTO RESISTORS works on the principle of “Photo Conductivity”. There are many types but one material is popular and it is cadmium sulfide (CdS). LDRs are made from semiconductor materials to enable them to have their light-sensitive properties. In this circuit, we are making a Light Sensor using LDR with Arduino to control a bulb/CFL as per light condition of the room or outside area. It’s like Dark and light Detector circuit but this time we are using Arduino to get more control over light. For this, we need a light sensor to detect the light condition and some circuitry to control the Light sensor. Today we are going to control the light based of darkness outside, the light turns ON automatically when it is dark outside and turns off when it gets bright. We all want our home appliances to be controlled automatically based on some conditions and that's called Home automation.
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