How are LDR used in automatic street light?

LDR sensor is used for detecting the presence of surrounding light so that during the day time when sun is bright, the street light is switched off automatically. During the night time when there is no light, the LDR sends signal to microcontroller to turn on the street light.

What is the principle of automatic street light?

The working principle of LDR is that it gives less resistance in high light intensity and high resistance in low light intensity (ie) it gives high resistance in dark or night and low resistance in day or light.

What are the applications of automatic street light?

These solar street lights are able to automatically sense outdoor light with the help of a sensor. They can this way smartly save power & give light on successive nights even when sunlight is unavailable for a couple of days. This is the reason many users nowadays are switching over to solar street lights.

What is automatic lighting control?

Automatic lighting controls offer an inexpensive, effec- tive way to minimize lighting costs, by turning unneeded lights off, or in some cases, dimming lights. There are three basic cat- egories of automatic lighting controls: timers, daylight harvest- ing controls and occupancy/vacancy controls.

What is LDR and its applications?

The LDR is used in the infrared astronomy. The LDR is used in light failure alarm circuits and used in light meter. The LDR used in smoke detectors. It is used for automatic contrast and brightness control in television receivers. It is used in photosensitive relay.

Which material is used in LDR?

cadmium sulfide
Modern light dependent resistors are made of lead sulfide, lead selenide, indium antimonide, and most commonly cadmium sulfide and cadmium selenide. The popular cadmium sulfide types are often indicated as CdS photoresistors.

What is the importance of automatic lights?

With automatic lights, you can make sure your employees have lights already on in the morning for a great start to their day. Automatic lights also give employees one less thing to worry about when leaving at the end of the day. It can also make their day a little easier if the lights are set to occupancy sensors.