Light Depending Resistor

May 14th, 2015
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An LED that turn on during night and turn off during day is amazing. Normally a Light Depending Resistor is used to sense the presence of LIGHT. We cannot connect LDR directly to LED. Some switching methods should be adopted to make an LED to respond, when LDR is kept at LIGHT or DARK. Transistors are normally used for switching.

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An LED That Turn On During Night And Turn OffAn LED that turn on during night and turn off during day is amazing. Normally a Light Depending Resistor is used to sense the presence of LIGHT. We cannot connect LDR directly to LED. Some switching methods should be adopted to make an LED to respond, when LDR is kept at LIGHT or DARK. Transistors are normally used for switching. This blog will help you to design a circuit that will turn on an LED during night and turn off during day like street lights. By some simple modifications in this circuit, we can easily reverse the operation.Circuit Diagram Connections are done as shown in the following circuit diagram. Transistor used is BC547. Pinout diagram of BC547 is given at right side top of following image.Transistor- BC 547 is the transistor used here. It is an npn transistor and is suitable for small operations

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