The document proposes an energy efficient intelligent LED lighting system that uses sensors and wireless communication to automatically control LED light intensity based on user presence and surroundings. The system aims to maximize energy savings while maintaining user satisfaction. It uses sensors to detect movement and light levels, and can adjust the minimum light intensity setting over time based on feedback from users through a mobile app. An experiment showed the system can reduce total energy consumption by up to 21.9% compared to traditional lighting.

1. ENERGY EFFICIENT INTELLIGENT
LED LIGHTING SYSTEM
PRIYA JOHNSON
S7 F
ROLL NO : 44

2. CONTENTS
• Introduction
• Existing Systems
• Proposed System
• LED
• Operating principle of proposed system
• Overview of proposed system
• Minimum Light Intensity Control Algorithm
• Hardware Block diagram
• PCB layout of proposed system
• Case study
• Experiment result
• Disadvantages
• Conclusion
• Reference
1

3. INTRODUCTION
• Light accounts for approx. 20% of total energy
consumption
• Invention of LED reduces energy consumption of a
light
• The intelligent light control system can reduce
energy consumption
• Automatically control the intensity of illumination
through situation awareness
• About 15% of total energy consumption can be
reduced through light control according to user’s
living pattern
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4. EXISTING SYSTEMS
• Can support ON-OFF / dimming control after
detecting object, intensity of illumination or
controlling with time setting
• It is hard to apply to complex environments
because of presence of variety of users
• Mostly installed in places such as front door or
hallway
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5. PROPOSED SYSTEM
• The new intelligent light control system should be
designed :
 to maximize the utilization of an LED
 to have communication capability
 to control based on the situation awareness
 to enhance both energy efficiency & user
satisfaction
• The system uses multi-sensors & wireless
communication technology
• Control LED light according to user’s state &
surroundings
• Autonomously adjust the min light intensity
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6. LED
• Two lead semiconductor light source
• A PN junction diode which emits light when
forward biased
• The amount of light output is directly
proportional to forward current
• Light energy is released at the junction when
electrons and holes are recombined
• After recombination the electrons in the
conduction band of N-region falls into the holes
in the valance band of P-region
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7. CONTD…
• The difference in energy between the conduction
band and valance band is radiated in the form of
light
• The semiconductor material used for manufacturing
LED:
Gallium arsenide-infrared radiation
Gallium phosphide-red or yellow
Gallium arsenide phosphide-red or green
Gallium nitride-blue
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8. OPERATING PRINCIPLE OF
PROPOSED SYSTEM
Lmin – minimum light intensity
Lmax – maximum light intensity
Tr - rise time period of light intensity
Tm - time period b/w no movement detection &
that light intensity begins to fall
Tf - fall time period of light intensity
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9. CONTD…
8
• Illumination intensity becomes Lmax if user
movement is detected
• Illumination intensity becomes Lmin if user
movement is not detected for a certain time period

10. CONTD…
• As Tr is longer, Tm & Tf are smaller and Lmax & Lmin
are smaller, energy saving effects becomes larger
• Inconvenience of users can be bigger
• Necessary to properly set the value to space
environmental characteristics
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11. OVERVIEW OF PROPOSED SYSTEM
10

12. CONTD…
• Autonomous control based on user movement
• Autonomous control based on brightness of room
• Autonomous optimization of system control & state
variables
• Collective control using a wireless technology
• Control & system setting through a wireless controller &
a mobile phone application
 Reduce energy consumption via interaction with
information about user’s state
 Autonomous control could lead to disturbance to
residents
 It automatically optimizes the system control & state
variables 11

13. MINIMUM LIGHT INTENSITY
CONTROL ALGORITHM
12

14. CONTD…
• Signal of inconvenience received from users via
smart phones
• Count down timer interrupts system after a certain
time period
• The system automatically adjusts Lmin based on
signal of inconvenience
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15. CONTD…
1. Check whether a signal of inconvenience has
occurred. If a signal of inconvenience has
occurred, then Lminn = (Lmincon+Lminn-1)/2, Lminincon =
Lminn-1, n = n + 1,and timer = T. Check again
whether a signal of inconvenience has occurred.
2. If a signal of inconvenience has occurred do as in
step 1, then If a signal of inconvenience has not
occurred, then check whether timer =0
3. If timer =0, then Lminn = (Lminincon+Lminn-1)/2,
Lmincon =Lminn-1, n = n + 1, and timer = T. And then,
check whether Lmincon - Lminincon <5 or not. If timer is
not equal to zero, check again whether a signal of
inconvenience has occurred. 13

16. CONTD…
4. If Lmincon - Lminincon < 5, then terminate this
flowchart. If Lmincon - Lminincon not < 5, then go to
step 5
5. Check whether a signal of inconvenience has
occurred. If a signal of inconvenience has
occurred, then Lminn = (Lmincon+Lminn-1)/2, Lminincon
= Lminn-1, n = n + 1,and timer = T. If a signal of
inconvenience has not occurred, then perform
again from Step 3
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17. HARDWARE BLOCK DIAGRAM
15
• 8 bit microcontroller : Role in situation analysis,
event processing, and learning. This part optimizes
the control and state variables to adapt itself to the
various environments.
• Motion detection sensor : detects moving objects
• CDS sensor :Cadmium sulphide – photo resistive
sensors

18. CONTD…
• ZigBee module : Used for communication with other
LED lighting system and networked devices
• LED driver part : Consists of current controller
modules for driving LEDs
• There are two ports that are controllable and are
able to control for 255 levels of brightness
• The power part is composed of a power regulator
& SMPS
16

19. PCB LAYOUT OF PROPOSED
SYSTEM
• When switch g is On & h is On ; switch a, b and c
are used to adjust Lmax ; switch d, e, and f are used
to adjust Lmin
• When switch g is On & h is Off ; switch a, b, and c
are used to adjust Tr ; switch d, e and f are used to
adjust Tf 17

20. CONTD…
• When switch g is Off & h is On ; switch a, b, and c
are used to adjust countdown timer(Tm)
• If switch g is Off & the h is Off ; the proposed
system operates as a general LED lighting without
intelligent lighting control.
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21. CASE STUDY
• Home and office building : User satisfaction is an
important factor ; Lmin is set to the high value
• Warehouse : User satisfaction is a less important
factor ; Lmin is set to low value ; a significant amount
of energy consumption can be reduced
• Parking lot : User satisfaction is an less important
factor ; Lmin is set to the high value only from the
entrance of the parking lot to a vacant parking
space ; when a user gets out of a car, Lmin is set to
the high value only from user's current position to
the entrance of the building
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22. EXPERIMENT RESULT
• The proposed lighting control system reduces
energy consumption up to approximately 21.9%.
20

23. DISADVANTAGES
• Initial cost of LED system is high, but it can be
overcome in the long run
• Implementation of proposed system to the existing
system is difficult because it requires
implementation of additional components to each
and every building
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24. CONCLUSION
• Utilizes multi sensors and wireless communication
technology in order to control an LED light
according to the user’s state and the surroundings
• Can autonomously adjust the minimum light
intensity value to enhance both energy efficiency
and user satisfaction
• Reduces total power consumption up to 21.9%.
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25. REFERENCES
[1]Jinsung Byun,Insung Hong,Byoungjoo Lee,Sehyun
Park, "Intelligent Household LED Lighting System
Considering Energy Efficiency and User
Satisfaction,” IEEE Trans. on Consumer
Electron.,Vol .59 , No.1, Feb.2013
[2] S. Matta and S. M. Mahmud, "An intelligent light
control system for power saving," in Proceedings of
the Annual Conference of the IEEE Industrial
Electronics Society, pp. 3316-3321, 2010
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26. 24
THANK YOU…

27. QUESTIONS???
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