What is LDR in automatic street light?

It automatically switches OFF lights when Sunlight fall on it ( i.e on LDR ) e.g in morning, by using a sensor called LDR (Light Dependent Resistor) which senses the light just like our eyes.

How do you make an automatic street light with LDR?

During night the LDR gives a high resistance as a result the voltage passing through the base will become less than 5V so the LED glows. During day time LDR gives a low resistance as a result the voltage through base is greater than 5V which switches the current to the emitter. This turns LED off.

What is use 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 the working of LDR?

The working principle of an LDR is photoconductivity, which is nothing but an optical phenomenon. When the light is absorbed by the material then the conductivity of the material enhances. When the light falls on the LDR, then the electrons in the valence band of the material are eager to the conduction band.

How do you make a automatic street light?

How to Make Automatic Street Light

1. Step 1: Take All Components As Shown Below. Components required –
2. Step 2: Pins of BC547 Transistor.
3. Step 3: Connect LED.
4. Step 4: Solder LDR.
5. Step 5: Connect 20K Resistor.
6. Step 6: Solder Battery Clipper Wire.
7. Step 7: How to Use This Automatic Street Light.

How do you make an automatic street light system?

How to Make Automatic Street Light

1. Step 1: Take All Components As Shown Below. 3 More Images.
2. Step 2: Pins of BC547 Transistor.
3. Step 3: Connect LED.
4. Step 4: Solder LDR.
5. Step 5: Connect 20K Resistor.
6. Step 6: Solder Battery Clipper Wire.
7. Step 7: How to Use This Automatic Street Light.

What is the principle of LDR?

What happens when light falls on LDR?

It is an electronic component whose resistance gets changed when light falls on it, as resistivity of the light dependent resistor is a function of light. Thus we can say that when light falls upon LDR, resistance decreases and conductivity of the LDR increases.

What are the advantages of automatic light?

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.

How does automatic night light work?

Automatic Night Lights Resistors resist the flow of electricity. The night light has a detector circuit which automatically turns on the light when the resistance reaches a certain level. High resistance means that there is no light shining on the CDs cell, so the night light turns on.

How does automatic street light control using LDR work?

Project Report On Automatic Street Light Control Using Light Dependent Resistor (LDR). Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website.

What kind of transistor is used for street light control?

Here is our new simple Electrical/Electronics project about Automatic Street Light Control System for students and hobbyists. It is a simple and powerful concept, which uses transistor (BC 547 NPN) as a switch to switch ON and OFF the street light system automatically.

How big is a street light control system?

Output operation Normally open Output DC three-wire system (NPN) Diameter, Length 18mm, 45mm Ambient -25_70 temperature Fig. 1 Block diagram of street light system 8 fHistory of Street Lighting Historically, street lighting of roads and streets was introduced to combat crime after daylight hours.

How does automatic street light control reduce energy consumption?

By using this Automatic system for street light controlling, we can reduce energy consumption because the manually operated street lights are not switched off properly even the sunlight comes and also not switched on earlier before sunset.