automatic street light control system

Posted on Feb 6, 2014

Automatic Street light system is very common nowadays as it provides intelligent street lighting mechanism. It provides light automatically during night. These energy saving street lights make uses of incandescent lamps instead of LEDs. So here we will teach you how to make an electronic circuit for street light automation. The heart of this circuit

automatic street light control system
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is a LDR (Light Depended Resistor) which is connected as a potential divider with a 56K resistor. The drop across LDR is used for switching the transistor. Solar led street lighting systems are the advanced versions of this ordinary automatic street light controller. The unique property of LDR (Light Depended Resistor) is utilized here. LDR is a variable resistor. It has very low resistance in the presence of light and very high resistance in the absence of light. Here the drop across LDR varies with changes in light intensity. That is voltage drop across the LDR is minimum in the presence of light and maximum in the absence of light. One end of the LDR is connected to the base of a BC 187 transistor. At night, the drop is very high (> 0. 6V) and it is sufficient to turn on the transistor.

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