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SOLAR PANEL STREET LIGHT AUTOMATIC
BRIGHTNESS CONTROL SYSTEM
Under taken by:
Name 1
Roll no. 1
Name 2
Roll no. 2
Name 3
Roll no. 3
Name 4
Roll no. 4
ABSTRACT:
Needs no manual operation for switching ON and OFF. When there is a
need of light it automatically switches ON. When darkness rises to a
certain level then sensor circuit gets activated and switches ON and
when there is other source of light i.e. daytime, the street light gets
OFF. The sensitiveness of the street light can also be adjusted. In this
project we have used two L.E.D as a symbol of street lamp, but for high
power switching one can connect Relay (electromagnetic switch) in
between the high powered voltage and microcontroller. The
microcontroller is used to control the relay as a switch on\off.
WORKING PRINCIPLE:
This circuit uses microcontroller and photo resistors to control the
brightness of the street lights and also to switch on\off the street lights.
Photo resistors are used along with series resistance to provide the
variable amount of voltage to the microcontroller.
Photo resistors are special type of resistance whose value depends on
the brightness of the light which is falling on it. It has resistance of about
1 mega ohm in total darkness, but a resistance of only about 5k ohms
when illuminated. It responds to a large part of light spectrum. In this
project, we made a potential divider circuit with Photo resistors and
resistance connected in series. We know that voltage is directly
proportional to conductance so more voltage we will get from this
divider when Photo resistors is getting light and low voltage in darkness.
This divided voltage is given to the microcontroller. Sensitiveness can be
adjusted using the microcontroller programming.
BLOCK DIAGRAM:
SCHEMATIC DIAGRAM:
COMPONENTS REQUIRED
 HARDWARE
1.
Breadboard
2.
General purpose Board
3.
Single Strand Wires (Black, Red, Blue)
4.
DC Power Supply (Using 9V Battery)
5.
Solar panel
6.
Ceramic Capacitors
7.
Resistors
8.
Potentiometer
9.
Diodes
10
Relay
11. Microcontroller
12. 9V Battery
 SOFTWARE
1.
2.
Microcontroller Hex File Generator
Microcontroller Hex file Uploader
APPLICATIONS:
 By using this Automatic system for street light controlling, we
can reduce energy consumption because the manually
operated street lights are not switched off even under sunlight
and are not switched on before sunset.
 In sunny and rainy days, ON and OFF time
differ noticeably which is one of the major disadvantage of
using timer circuits or manual operation for switching the
street light system.
REFERENCES:
http://www.electricaltechnology.org/2013/04/automatic-street-lightcontrol.html
http://www.electronicshub.org/automatic-street-light-controllercircuit-using-relays-and-ldr/http://circuiteasy.com/automatic-streetlight/
http://www.instructables.com/id/Dark-Sensor-light-sensor-automaticstreet-light-/
http://www.circuitsgallery.com/2012/11/street-light-circuit.html
http://www.slideshare.net/devang25/automatic-control-of-street-lightusing-ldr