Design, Construction and Calibration of Automatic Street Light Controller Using Light Dependent Resistor (LDR)

Automatic street light power saving system using the Light Dependent Resistor (LDR) is a simple and powerful concept, to switch ON/OFF the street light system automatically. It automatically switches ON the streetlight when the sunlight goes below the visible region of our eyes and switches OFF the streetlight when ample amount of sunlight is available. From this work, it was observed that the implementation of LDR in streetlight circuit design would reduce the running cost of street lightning system by 51.7%.