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Did you ever think how street lights turn ON in the night and turn OFF automatically at morning ? Is there any individual who comes to ON/OFF these lights? There is a circuit behind this automatic on off called Automatic Street Light Controller. This circuit helps to Turn on or off the street lights automatically by using relays and LDR. It maintains the whole intensity of the street light as per to the change in natural light. Moreover, the LDR has the feature to change its resistance according to the strength of the light.