This document describes an automatic street light circuit designed by students Abhishek and Ajith Kumar at Kalasalingam University. The circuit uses a light dependent resistor and transistors to sense when it is nighttime and turn on a street light. It includes a block diagram and circuit diagram. The components used are a relay, voltage regulator, fuse, light dependent resistor, resistors, transistors, battery, and lamp. When it is dark, the resistance of the light dependent resistor increases, which turns on the transistor and energizes the relay to power the street light. This circuit automatically switches the light on at night and off during the day to prevent wasting electricity.
Many of the people have a phobia of darkness, so to assist them in such situation, we have explained a simple circuit. It will automatically turn on street light in the way of LEDs or bulb coupled with relay. Working this circuit is very much easy and also the power consumed by the circuit is very low because of the very few components used in the circuit.
Many of the people have a phobia of darkness, so to assist them in such situation, we have explained a simple circuit. It will automatically turn on street light in the way of LEDs or bulb coupled with relay. Working this circuit is very much easy and also the power consumed by the circuit is very low because of the very few components used in the circuit.
Reducing the wastage of power
Reducing physical efforts
Improve the system in our daily life
Light falls on LDR, it shows its minimum resistance and voltage drops across LDR less than VBE of Transistor Q1.
So, no current will go from the collector to the emitter and transistor remains turn off.
Automatic Streetlight System Using LDR and Arduino UNO. An electronics short project done by students of Mechanical Engineering,IUBAT. This Arduino based project will provide a competent method for lighting systems and make the whole process of energy saving easierand efficient. With a capability to change the amount of light emitted depending upon the outside condition is no doubt an innovationwith many future application apart from the fact that it can also be used in many present day tech such as street light, parklights, industrial lights and many more.
smart street light detector based on sensors. This is basically designed to reduce the power consumption of the street light. And help out to conserve more and more energy.
This ppt describes how to detect vehicle movement on highways to switch ON only a block of street lights ahead of it (vehicle), and to switch OFF the trailing lights to save energy.
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Reducing the wastage of power
Reducing physical efforts
Improve the system in our daily life
Light falls on LDR, it shows its minimum resistance and voltage drops across LDR less than VBE of Transistor Q1.
So, no current will go from the collector to the emitter and transistor remains turn off.
Automatic Streetlight System Using LDR and Arduino UNO. An electronics short project done by students of Mechanical Engineering,IUBAT. This Arduino based project will provide a competent method for lighting systems and make the whole process of energy saving easierand efficient. With a capability to change the amount of light emitted depending upon the outside condition is no doubt an innovationwith many future application apart from the fact that it can also be used in many present day tech such as street light, parklights, industrial lights and many more.
smart street light detector based on sensors. This is basically designed to reduce the power consumption of the street light. And help out to conserve more and more energy.
This ppt describes how to detect vehicle movement on highways to switch ON only a block of street lights ahead of it (vehicle), and to switch OFF the trailing lights to save energy.
Edgefxkits.com has a wide range of electronic projects ideas that are primarily helpful for ECE, EEE and EIE students and the ideas can be applied for real life purposes as well.
http://www.edgefxkits.com/
Visit our page to get more ideas on popular electronic projects developed by professionals.
Edgefx provides free verified electronic projects kits around the world with abstracts, circuit diagrams, and free electronic software. We provide guidance manual for Do It Yourself Kits (DIY) with the modules at best price along with free shipping.
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automatic street light
1. KALASALINGAM UNIVERSITY
Department of Electronics and Communication Engineering
AUTOMATIC STREET LIGHT CIRCUIT
SUBMITTED BY GUIDED BY
Abhishek (9911005002) Mr.M.K.Parmathma
Ajith Kumar(9911005005) Assistant Professor
ECE ,KLU
1
2. OVERVIEW OF MINI PROJECT
2
โข The main purpose of designing this project is to prevent
loss of current unnecessarily during day time.
โข During night the bulb will automatically glow .
4. ABSTRACT
๏ A street light that automatically switches ON when the night falls and
turns OFF when the sun rises.
๏ In fact we can use this circuit for implementing any type of automatic
night light.
๏ The circuit uses a LDR to sense the light .
๏ When there is light the resistance of LDR will be low.
๏ So the voltage drop across POT R2 will be high.This keeps the
transistor Q1 ON. The collector of Q1(BC107) is coupled to base of
Q2(SL100).
๏ So Q2 will be OFF and so do the relay. The bulb will remain OFF.
๏ When night falls the resistance of LDR increases to make the voltage
across the POT R2 to decrease below 0.6V.
๏ This makes transistor Q1 OFF which in turn makes Q2 ON. The relay
will be energized and the bulb will glow.
4
7. 7
๏ Relay is an electromagnetic device which is used to isolate two circuits
electrically and connect them magnetically.
๏ They are very useful devices and allow one circuit to switch another one
while they are completely separate.
๏ They are often used to interface an electronic circuit (working at a low
voltage) to an electrical circuit which works at very high voltage.
๏ For example, a relay can make a 5V DC battery circuit to switch a 230V
AC mains circuit. Thus a small sensor circuit can drive, say, a fan or an
electric bulb.
๏ A relay switch can be divided into two parts: input and output.
8. VOLTAGE REGULATOR
8
๏ It is a voltage regulator (7805) integrated circuit. It is a member of
78xx series of fixed linear voltage regulator ICs. The voltage source in a
circuit may have fluctuations and would not give the fixed voltage
output.
๏ The voltage regulator IC maintains the output voltage at a constant
value. The xx in 78xx indicates the fixed output voltage it is designed to
provide. It provides +9V regulated power supply.
๏ Capacitors of suitable values can be connected at input and output pins
depending upon the respective voltage levels.
9. FUSE[1A]
9
๏ Fuse is an electronics safety device placed in a circuit consisting of a
replaceable plug or tube containing wire or metal that will melt and
break the circuit if the current exceeds a specified amperage.
๏ Blow a fuse: to cause an electrical fuse to melt.
10. LIGHT DEPENDENT RESISTOR
10
๏ An LDR (Light dependent resistor), as its name suggests, offers
resistance in response to the ambient light.
๏ The resistance decreases as the intensity of incident light increases,
and vice versa.
๏ In the absence of light, LDR exhibits a resistance of the order of mega-
ohms which decreases to few hundred ohms in the presence of light.
๏ It can act as a sensor, since a varying voltage drop can be obtained in
accordance with the varying light.
๏ It is made up of cadmium sulphide (CdS).
๏ An LDR has a zigzag cadmium sulphide track. It is a bilateral device,
i.e., conducts in both directions in same fashion.
11. RESISTOR
11
๏ Resistor is a passive component used to control current in
a circuit.
๏ Its resistance is given by the ratio of voltage applied
across its terminals to the current passing through it.
๏ Thus a particular value of resistor, for fixed voltage,
limits the current through it.
๏ They are omnipresent in electronic circuits.
๏ Resistors can be either fixed or variable.
๏ The low power resistors are comparatively smaller in size
than high power resistors.
12. TRANSISTOR
12
๏ BC107 is an NPN bi-polar junction transistor. A transistor, stands for
transfer of resistance, is commonly used to amplify current.
๏ A small current at its base controls a larger current at collector &
emitter terminals.
๏ BC107 is mainly used for amplification and switching purposes. It has
a maximum current gain of 800.
๏ The transistor terminals require a fixed DC voltage to operate in the
desired region of its characteristic curves. This is known as the biasing.
๏ The voltage divider is the commonly used biasing mode.
๏ For switching applications, transistor is biased so that it remains fully
on if there is a signal at its base.
๏ In the absence of base signal, it gets completely off.
13. TRANSISTOR[SL100]
13
๏ SL100 is a general purpose, medium power NPN transistor. It is
mostly used as switch in common emitter configuration.
๏ The transistor terminals require a fixed DC voltage to operate in the
desired region of its characteristic curves. This is known as the biasing.
๏ For switching applications, SL100 is biased in such a way that it
remains fully on if there is a signal at its base. In the absence of base
signal, it gets turned off completely.
๏ The emitter leg of SL100 is indicated by a protruding edge in the
transistor case. The base is nearest to the emitter while collector lies at
other extreme of the casing.
14. BATTERY
14
๏ It is a collection of one or more electrochemical cells in which stored
chemical energy is converted into electrical energy.
๏ One half cell houses the Anode to which the positive ions migrate from
the Electrolyte and the other houses the Cathode to which the
negative ones drift.
๏ The two cells are may be connected via a semi permeable membranous
structure allowing ions to flow but not the mixing of electrolytes as in
the case of most primary cells or in the same solution as in secondary
cells.
๏ The performance of the cell continues to dip gradually as the
concentration of ions in the solutions decrease, marked by an increase
in internal resistance eventually leading to the exhaustion of the
battery.