How do street lights turn on automatically?

I walked by a street light, and it lights up even when I am meters away. How did it do that?
  • Light sensor: The photosensitive components in the street light can detect the brightness of light in the surrounding environment. Common photosensitive components are photoresistors and photodiodes. When the brightness is lower than the set value, the street light will turn off automatically.
  • Setting time: By using the presupposed time controller, the street light can automatically turn on or off according to the schedule. Usually, the schedule can be flexible. The street light can be set to automatically turn on in certain periods when there is heavy traffic.、

More reading: Street Sensor Light: How Does It Work to Save The Costs

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