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REMOTE CONTROLED SECURITY LIGHTS SYSTEM

All remote controls share the basic concept of communication technology however there is no universal standard method of encoding. This remote control system will use infra-red light emitting diodes to send out signals in response to button pushes. It will have a preamble address to synchronies the receiver to identify the source and make it work without interferences. However this remote controller might be different from the ones used in TVs and Vcrs because its mostly used either to switch ON or OFF security lights and may not have control functions like control of brightness or control of dimness.

Details

language		english
wordcount		9878 (cca 28 pages)
contextual quality		N/A
language level		N/A
price		free
sources		3

Table of contents

1.0 CHAPTER ONE

1.1 Introduction 1
1.2 Objectives 1
1.3 Specifications 1
1.4 Justification of the project 3

2.0 CHAPTER TWO

2.00 Theory of components and design 4
2.01 Power supply 4
                           2.010 Transformers 4
                           2.011 Laminated core transformer 5
                           2.012 Toroidal transformer 5
                           2.013 Autotransformer 5
                           2.014 Stray field transformer 6
                           2.015 Polyphase transformer 6
                           2.016 Isolating transformer 6
2.02 Rectification 7
                        2.021 half wave rectification 7
                        2.022 Centre tapped full wave rectification 8
                        2.023 Bridge rectifier 8
2.03 Filter circuit 10
2.04 Voltage stabilizer 12
2.05 Infrared transmitter circuit 14
2.06 Infrared LED 20
2.07 Design of infrared transmitter circuit 21

2.1 Infrared receiver circuit 23
2.11 Design of the Infrared receiver circuit 23

2.2 Comparator circuit 24
                    2.21 Operational amplifier as a voltage comparator 25
2.22 Design of the comparator circuit 26

2.3 Reference circuit 27
                   2.31 Theory of resistors 27
                   2.32 Units 28
2.34 Design of the reference circuit 31
2.4 Bistable flip Flop 32
            
2.46 Design of the Bistable flip flop 38

2.5 Driver circuit 40

2.6 Switching circuit 40
                 2.61 Relay drivers 40
                 2.62 Transistor as a switch 40
                 2.63 MOSFET as a switch 41
2.64 Design of the switching circuit 42

3.0    CHAPTER THREE

3.1 Complete circuit diagram 43

Preview of the essay: REMOTE CONTROLED SECURITY LIGHTS SYSTEM

CHAPTER ONE. INTRODUCTION 1.1 Background All remote controls share the basic concept of communication technology however there is no universal standard method of encoding. This remote control system will use infra-red light emitting diodes to send out signals in response to button pushes. It will have a preamble address to synchronies the receiver to identify the source and make it work without interferences. However this remote controller might be different from the ones used in TVs and Vcrs because its mostly used either to switch ON or OFF security lights and may not have control functions like control of brightness or control of dimness. SPECIFICATIONS Supply voltage - 4.5 V Frequency of operation - 30 KHZ Standby current - less than 2uA Operating range – 7 meters typical FUNCTIONAL BLOCK DIAGRAM OVERALL OPERATION OF THE BLOCK The I R transmitter contains two buttons that are used to select one of the two frequencies used. The two frequencies are 30 and 33 KHz. The transmitter will also ...
... OF THE SWITCHING CIRCUIT In our case a transistor switch is considered. This is because it is easier to switch with compared to other switching devices. Since the load operated is rated 240 volts ac, relay is used alongside the transistor. The circuit is illustrated below. [pic] A 12 volts relay with normally open contacts is used. The relay coil has an impedance of 200 ohms. Therefore when switched with 12 volts, Q1 collector current IC= 12/200= 0.06A=60mA. Therefore Q1 should withstand a collector current of 60 mA and Vceo of 12 volts. Therefore, the most ideal transistor for this is BC 337. BC337 can handle a collector current of 500mA and Vceo of 40 volts. The base current of BC337 should not exceed 1.2 mA. The output of the comparator is a maximum of 12 volts. To offer this protection, R5 is used. Therefore, R5= 12/0.0012=10 K( 3.0 CHAPTER THREE 1. Complete circuit diagram

Essay is in categories

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Engineering

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Electrical Engineering

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Electronic Devices

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Comments

Princess R.

Very voluminous and bulky in construction of the discussion. Over-all, very informative!

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