We need to save or conserve energy because most of the energy sources we depend on, like coal and natural gas can’t be replaced.
LDR is used to detect the ambient light. If the ambient light is below a specific value the lights are turned on. Automatic street light system is a simple concept which uses transistor as a switch.
This report talks about the design of a night light and the basic components. A link to the working is provided below.
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