How do the streetlights turn on automatically at night
When it is dark, the photocell has high resistance, so no current flows through the base and the relay is not activated -- the light is on. In a real street light the circuit might be a bit more advanced, but not a lot. It has the CdS cell, the transistor and the relay, but might need more than one transistor depending on the size of the relay.
Light Sensor Circuit Diagram with Working Operation
The light sensor circuit can be used to design various practical embedded systems based sensor based projects such as security alarm system by photo electric sensor, Arduino managed high sensitive LDR based power saver for street light control system, a solar highway lighting system with auto turn off in daytime, sunset to sunrise lighting switch, and so on.
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