speedchecker-140530020850-phpapp01

28
MAJOR PROJECT SPEED CHECKER ON HIGHWAY DEPARTMENT OF ELECTRONICS & COMMUNICATION 1 CHAPTER 1 INTRODUCTION 1.1 INTRODUCTION TO PROJECT A system designed to record and report on discrete activities within a process is called as Tracking System. In the same procedure we have developed a methodology of vehicle speed & direction system for robotics to control and achieve accurate direction speed for a class of non-linear systems in the presence of disturbances and parameter variations by using wireless communication technique. While driving on highways, motorists should not exceed the maximum speed limit permitted for their vehicle. However, accidents keep occurring due to speed violations since the drivers tend to ignore their speedometers. This speed checker will come handy for the highway traffic police as it will not only provide a digital display in accordance with a vehicle’s speed but sound an alarm if the vehicle exceeds the permissible speed for the highway. The system basically comprises two IR LED’s Transistor & receiver sensor pairs, which are installed on the highway 100cm apart, with the transmitter and the receiver of each pair on the opposite sides of the road. The system displays the time taken by the vehicle in crossing this distance from one pair to the other from which the speed of the vehicle can be calculated as follows: Here, Distance is the total distance between the pair of sensors. Time is the interval between crossing the first sensor and second sensor. Microcontroller 8051 is the heart of the system, which control all the function of the circuit. It measures the speed and control the circuit through a programming flashed inside 8051. IR sensor are used as a pair of eye that keep watching the speed of each vehicle crossing the sensors. A seven segment display is used to display the total speed of the vehicle (After calculation is done inside controller.).

description

project

Transcript of speedchecker-140530020850-phpapp01

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 1

    CHAPTER 1

    INTRODUCTION

    1.1 INTRODUCTION TO PROJECT

    A system designed to record and report on discrete activities within a process is called as

    Tracking System. In the same procedure we have developed a methodology of vehicle

    speed & direction system for robotics to control and achieve accurate direction speed for a

    class of non-linear systems in the presence of disturbances and parameter variations by

    using wireless communication technique.

    While driving on highways, motorists should not exceed the maximum speed limit

    permitted for their vehicle. However, accidents keep occurring due to speed violations

    since the drivers tend to ignore their speedometers. This speed checker will come handy

    for the highway traffic police as it will not only provide a digital display in accordance

    with a vehicles speed but sound an alarm if the vehicle exceeds the permissible speed for

    the highway. The system basically comprises two IR LEDs Transistor & receiver sensor

    pairs, which are installed on the highway 100cm apart, with the transmitter and the receiver

    of each pair on the opposite sides of the road. The system displays the time taken by the

    vehicle in crossing this distance from one pair to the other from which the speed of the

    vehicle can be calculated as follows:

    Here,

    Distance is the total distance between the pair of sensors.

    Time is the interval between crossing the first sensor and second sensor.

    Microcontroller 8051 is the heart of the system, which control all the function of the circuit.

    It measures the speed and control the circuit through a programming flashed inside 8051.

    IR sensor are used as a pair of eye that keep watching the speed of each vehicle crossing

    the sensors. A seven segment display is used to display the total speed of the vehicle (After

    calculation is done inside controller.).

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 2

    1.2 BLOCK DIAGRAM

    fig 1: Block Diagram

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 3

    CHAPTER 2

    WORKING OF THE SYSTEM

    2.1 WORKING

    In this project we use IR sensors to detect the presence of a vehicle. According to this

    project, 2 IR sensors are placed apart with a fixed known distance. Whenever IR rays are

    interrupted by a vehicle during first sensor the count up timer is started. When the other IR

    sensor senses the presence of vehicle, the count up timer is stopped. As the distance and

    time the IR receiver receives the IR signals is noted by microcontroller and from that we

    need to calculate speed. Here speed is calculated from the well-known formula of speed

    which is distance/time. The Seven segment display is used to display the speed of the

    vehicle. The microcontroller is used to monitor the all control operations needed for the

    project.

    2.1.1 Power Supply

    The 8051 microcontroller works on +5V DC. Now here we have 220V AC as the input. So

    first of all, we need to step down the voltage using transformer. Here the transformer will

    step down the 220V AC to 9V AC at 50Hz. To convert AC to DC, a bridge rectifier is

    placed using 1N4007, a p-n diode. Two capacitor of 470F & .01F is used as a filter.

    Now, this DC output is fed to a 7805 voltage regulator which will convert the DC input

    into +5V DC.

    Fig 2.1: Power supply

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 4

    2.1.2 8051

    8051 block consist of the P89V51RD2 microcontroller. It will run on the frequency of

    about 11.0592 MHz. 8051 is the brain of the system. All the components will drive by the

    instructions provided by the microcontroller through a programming code burn inside the

    8051. Pin diagram of Microcontroller 8051 is shown below.

    Fig 2.2: 8051 Pin diagram

    2.2 CIRCUIT DIAGRAM

    The main circuit diagram of the project is shown below.

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 5

    Fig 2.3: Main circuit (a)

    2.3 PCB LAYOUT

    Fig 2.6: PCB Layout

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 6

    2.3 PROGRAM

    #include

    sfr LCD=0x80;

    sbit RS=P2^6;

    sbit EN=P2^7;

    unsigned int a=0, i=0, v;

    void tm();

    void delay(unsigned char time)

    {

    unsigned int a,b;

    for(a=0;a

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 7

    lcdcmd(0x38);

    delay(20);

    lcdcmd(0x0c);

    delay(20);

    lcdcmd(0x01);

    delay(20);

    lcdcmd(0x06);

    delay(20);

    }

    void ISR_ex0(void) interrupt 0

    {

    while(1)

    {

    tm();

    a++;

    }

    }

    void ISR_ex1(void) interrupt 2

    {

    unsigned char m,n,temp,o;

    v=100/a;

    m=v/100;

    temp=v%100;

    n=temp/10;

    o=temp%10;

    lcdcmd(0xc6);

    lcddata(m+48);

    lcddata(n+48);

    lcddata(o+48);

    a=0;

    lcddata('m');

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 8

    lcddata('m');

    lcddata('/');

    lcddata('s');

    lcddata('e');

    lcddata('c');

    lcddata(' ');

    lcddata(' ');

    }

    void main()

    {

    unsigned char w[]="WELCOMESPEED=WAITING...";

    IT0 = 1; // Configure interrupt 0 for falling edge on /INT0 (P3.2)

    EX0 = 1; // Enable EX0 Interrupt

    IT1 = 1; // Configure interrupt 1 for falling edge on /INT0 (P3.2)

    EX1 = 1; // Enable EX1 Interrupt

    EA = 1; // Enable Global Interrupt Flag

    IP=0x04; // Priority of ex1 high

    lcd_init();

    lcdcmd(0x84);

    for(i=0;i

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 9

    for(y=0;y

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 10

    CHAPTER 3

    COMPONENTS USED IN THE PROJECT

    3.1 COMPONENT LIST

    1. INTEGRATED CIRCUIT

    P89V51RD2

    7805

    2. SWITCH

    PUSH-TO-ON Switch

    3. DIODE

    1N4007 PN Diode

    4. CAPACITORS

    1000F 25V

    22pF

    100nF 50V

    10F 40V

    5. RESISTORS

    220

    470

    10 K

    SIP-Resistor 10K

    6. CRYSTAL

    11.0592MHz

    7. TRANSFORMER

    8. LCD

    9. IR LED

    10. LED

    11. PRESET

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 11

    3.2 COMPONENT DESCRIPTIONS

    3.2.1 INTEGRATED CIRCUIT

    P89V51RD2

    The P89V51RD2 is an 8051 microcontroller with 64 kB Flash and 1024 bytes of data

    RAM.

    Fig 3.1: P89V51RD2 Pin Diagram

    P0.0 to P0.7 -Port 0: Port 0 is an 8-bit open drain bidirectional I/O port. Port 0 pins that

    have 1s written to them float, and in this state can be used as high-impedance inputs. Port

    0 is also the multiplexed low-order address and data bus during accesses to external code

    and data memory. In this application, it uses strong internal pull-ups when transitioning to

    1s. Port 0 also receives the code bytes during the external host mode programming, and

    outputs the code bytes during the external host mode verification. External pull-ups are

    required during program verification or as a general purpose I/O port.

    P1.0 to P1.7 -Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. The

    Port 1 pins are pulled high by the internal pull-ups when 1s are written to them and can

    be used as inputs in this state. As inputs, Port 1 pins that are externally pulled LOW will

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 12

    source current (IIL) because of the internal pull-ups. P1.5, P1.6, P1.7 have high current

    drive of 16 mA. Port 1 also receives the low-order address bytes during the external host

    mode programming and verification.

    P2.0 to P2.7 -Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2

    pins are pulled HIGH by the internal pull-ups when 1s are written to them and can be

    used as inputs in this state. As inputs, Port 2 pins that are externally pulled LOW will source

    current (IIL) because of the internal pull-ups. Port 2 sends the high-order address byte

    during fetches from external program memory and during accesses to external Data

    Memory that use 16-bitaddress (MOVX@DPTR). In this application, it uses strong internal

    pull-ups when transitioning to 1s. Port 2 also receives some control signals and a partial

    of high-order address bits during the external host mode programming and verification.

    P3.0 to P3.7 -Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3

    pins are pulled HIGH by the internal pull-ups when 1s are written to them and can be

    used as inputs in this state. As inputs, Port 3 pins that are externally pulled LOW will source

    current (IIL) because of the internal pull-ups. Port 3 also receives some control signals and

    a partial of high-order address bits during the external host mode programming and

    verification.

    PSEN - Program Store Enable: PSEN is the read strobe for external program memory.

    When the device is executing from internal program memory, PSEN is inactive

    (HIGH).When the device is executing code from external program memory, PSEN is

    activated twice each machine cycle, except that two PSEN activations are skipped during

    each access to external data memory. A forced HIGH-to-LOW input transition on the

    PSEN pin while the RST input is continually held HIGH for more than 10 machine cycles

    will cause the device to enter external host mode programming.

    RST -Reset: While the oscillator is running, a HIGH logic state on this pin for two machine

    cycles will reset the device. If the PSEN pin is driven by a HIGH-to-LOW input transition

    while the RST input pin is held HIGH, the device will enter the external host mode;

    otherwise the device will enter the normal operation mode.

    EA -External Access Enable: EA must be connected to VSS in order to enable the device

    to fetch code from the external program memory. EA must be strapped to VDD for internal

    program execution. The EA pin can tolerate a high voltage of 12 V.

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 13

    ALE- Address Latch Enable: ALE is the output signal for latching the low byte of the

    address during an access to external memory.

    7805

    The 78xx (also sometimes known as LM78xx) series of devices is a family of self-

    contained fixed linear voltage regulator integrated circuits. The 78xx family is a very

    popular choice for many electronic circuits which require a regulated power supply, due to

    their ease of use and relative cheapness. When specifying individual ICs within this family,

    the xx is replaced with a two-digit number, which indicates the output voltage the particular

    device is designed to provide (for example, the 7805 has a 5 volt output, while the 7812

    produces 12 volts).

    Figure 3.2: IC 7805

    The 78xx lines are positive voltage regulators, meaning that they are designed to produce

    a voltage that is positive relative to a common ground. There is a related line of 79xx

    devices which are complementary negative vo1623ltage regulators. 78xx and 79xx Ics can

    be used in combination to provide both positive and negative supply voltages in the same

    circuit, if necessary. 78xx Ics have three terminals and are most commonly found in the

    TO220 form factor, although smaller surface-mount and larger TO3 packages are also

    available from some manufacturers. These devices typically support an input voltage which

    can be anywhere from a couple of volts over the intended output voltage, up to a maximum

    of 35 or 40 volts, and can typically provide up to around 1 or 1.5 amps of current (though

    smaller or larger packages may have a lower or higher current rating).

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 14

    3.2.2 SWITCH

    PUSH-TO-ON

    Push-to-on switch holds the circuit conducting while the switch is pressed. But

    when the switch is released, the circuit stops conducting.

    On the other hand, two way switches doesnt need to pressed continue. It do not require

    the continue effort to on the circuit. It has two states. When the switch is slides to left,

    switch gives 1 and if it slides to right, the output is 0.

    Figure 3.4: PUSH-TO-ON Switch

    3.2.3 DIODE

    1N4007 PN DIODE

    The diode used here is a p-n junction diode i.e. 1N4007. Its reverse breakdown

    voltage is 1000V. This diode is used as the rectifier.

    Figure 3.5: 1N4007

    3.2.4 CAPACITORS

    In the project, two types of capacitors are used.

    1. Electrolytic (47F 50V, 10F 40V, 470F 25V)

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 15

    2. Ceramic Disc (33pF)

    Electrolytic capacitors are polarized capacitors are made of oxide film on aluminum foils.

    These are cheaper and easily available. The range of values typically varies from 1uF to

    47000uF and large tolerance of 20%. The voltage ratings range up to 500V. They have

    high capacitance to volume ratio and used for smoothing in power supply circuits or

    coupling capacitors in audio amplifiers. These are available in both leaded and surface

    mount packages. The capacitance value and voltage ratings are either printed in F.

    Figure 3.6: Electrolytic Capacitor

    The non polarized type ceramic capacitors which are also known as Disc capacitors are

    widely used these days. These are available in millions of varieties of cost and

    performance. The features of ceramic capacitor depend upon: Type of ceramic dielectric

    used in the capacitor which varies in the temperature coefficient and Dielectric losses. The

    exact formulas of the different ceramics used in ceramic capacitors vary from one

    manufacturer to another. The common compounds such as titanium dioxide, strontium

    titanate, and barium titanateare the three main types available although other types such as

    leaded disc ceramic capacitors for through hole mounting which are resin coated,

    multilayer surface mount chip ceramic capacitors and microwave bare leadless disc

    ceramic capacitors that are designed to sit in a slot in the PCB and are soldered in place

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 16

    Figure 3.7: Ceramic Capacitor

    3.2.5 RESISTORS

    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.

    Figure 3.8: Resistor

    The different value of resistances are used to limit the currents or get the desired voltage

    drop according to the current-voltage rating of the device to be connected in the circuit.

    For example, if an LED of rating 2.3V and 6mA is to be connected with a supply of 5V, a

    voltage drop of 2.7V (5V-2.3V) and limiting current of 6mA is required. This can be

    achieved by providing a resistor of 450 connected in series with the LED.

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 17

    3.2.6 CRYSTAL

    A quartz crystal resonator plays a vital role in electronics oscillator circuitry. Sometimes

    mispronounced as crystal oscillator, it is rather a very important part of the feedback

    network of the oscillator circuitry. Electronics oscillators are used in frequency control

    application finding their usage in almost every industry ranging from small chips to

    aerospace.

    Figure 3.9: Crystal

    A quartz crystal is the heart of such type of resonators. Their characteristics like high

    quality factor (Q), stability, small size and low cost make them superior over other

    resonators like LC circuit, turning forks, ceramic resonator etc.

    The basic phenomenon behind working of a quartz crystal oscillator is the inverse piezo

    electric effect i.e., when electric field is applied across certain materials they start

    producing mechanical deformation. These mechanical deformation/movements are

    dependent on the elementary structure of the quartz crystal. Quartz is one of the naturally

    occurring materials which show the phenomena of piezo electricity; however for the

    purpose of resonator it is artificially developed since processing the naturally occurring

    quartz is difficult and costly process.

    3.2.7 TRANSFORMER

    The transformer is a static electro-magnetic device that transforms one alternating voltage

    (current) into another voltage (current). However, power remains the same during the

    transformation. Transformers play a major role in the transmission and distribution of ac

    power.

    Principle

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 18

    Transformer works on the principle of mutual induction. A transformer consists of

    laminated magnetic core forming the magnetic frame. Primary and secondary coils are

    wound upon the two cores of the magnetic frame, linked by the common magnetic flux.

    When an alternating voltage is applied across the primary coil, current flows in the primary

    coil producing magnetic flux in the transformer core, this flux induces voltage in secondary

    coil.

    Transformers are classified as: -

    (a) Based on position of the windings with respect to core i.e.

    1) Core type transformer

    2) Shell type transformer

    (b) Transformation ratio:

    1) Step up transformer

    2) Step down transformer

    a) Core & shell types:

    Figure 3.10: Step-Up Transformer.

    Figure 3.11: Step-Down Transformer

    Transformer is simplest electrical machine, which consists of windings on the laminated

    magnetic core. There are two possibilities of putting up the windings on the core.

    1) Winding encircle the core in the case of core type transformer

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 19

    2) Cores encircle the windings on shell type transformer.

    b) Step up and Step down: In these voltages transformation takes place according to

    whether the primary is high voltage coil or a low voltage coil.

    1) Lower to higher-> Step up

    2) Higher to lower-> Step down

    3.2.8 LCD

    LCD (Liquid Crystal Display) screen is an electronic display module and find a wide range

    of applications. A 16x2 LCD display is very basic module and is very commonly used in

    various devices and circuits. These modules are preferred over seven segments and other

    multi segment LEDs. The reasons being: LCDs are economical; easily programmable; have

    no limitation of displaying special & even custom characters (unlike in seven segments),

    animations and so on. A 16x2 LCD means it can display 16 characters per line and there

    are 2 such lines. In this LCD each character is displayed in 5x7 pixel matrix. This LCD has

    two registers, namely, Command and Data. The command register stores the command

    instructions given to the LCD. A command is an instruction given to LCD to do a

    predefined task like initializing it, clearing its screen, setting the cursor position, controlling

    display etc. The data register stores the data to be displayed on the LCD. The data is the

    ASCII value of the character to be displayed on the LCD. Click to learn more about internal

    structure of a LCD.

    Figure 3.12: LCD

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 20

    Figure 3.13: LCD Description

    3.2.9 IR LED

    Here the IR transmitter is nothing but the IR LED. It just looks like a normal LED but

    transmits the IR signals. Since the IR rays are out of the visible range we cannot observe

    the rays from the transmitter. These are infrared LEDs; the light output is not visible by

    our eyes. They can be used as replacement LEDs for remote controls, night vision for

    camcorders, invisible beam sensors, etc.

    Fig 3.14: IR LED

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 21

    3.2.10 LED

    A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator

    lamps in many devices and are increasingly used for other lighting. Appearing as practical

    electronic components in 1962, early LEDs emitted low-intensity red light, but modern

    versions are available across the visible, ultraviolet, and infrared wavelengths, with very

    high brightness. When a light-emitting diode is forward-biased (switched on), electrons are

    able to recombine with electron holes within the device, releasing energy in the form of

    photons. This effect is called electroluminescence and the color of the light

    Figure3.15: LED

    is determined by the energy gap of the semiconductor. LEDs present many advantages over

    incandescent light sources including lower energy consumption, longer lifetime, improved

    physical robustness, smaller size, and faster switching. LEDs powerful enough for room

    lighting are relatively expensive and require more precise current and heat management

    than compact fluorescent lamp sources of comparable output. As its name implies it is a

    diode, which emits light when forward biased. Charge carrier recombination takes place

    when electrons from the N-side cross the junction and recombine with the holes on the P

    side. Electrons are in the higher conduction band on the N side whereas holes are in the

    lower valence band on the P side. During recombination, some of the energy is given up in

    the form of heat and light. In the case of semiconductor materials like Gallium arsenide

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 22

    (GaAs), Gallium phosphide (GaP) and Gallium arsenide phosphide (GaAsP) a greater

    percentage of energy is released during recombination and is given out in the form of light.

    LED emits no light when junction is reversed biased.

    3.2.11 PRESET

    A preset is a three legged electronic component which can be made to offer varying

    resistance in a circuit. The resistance is varied by adjusting the rotary control over it. The

    adjustment can be done by using a small screw driver or a similar tool. The resistance does

    not vary linearly but rather varies in exponential or logarithmic manner. Such variable

    resistors are commonly used for adjusting sensitivity along with a sensor. The variable

    resistance is obtained across the single terminal at front and one of the two other terminals.

    The two legs at back offer fixed resistance which is divided by the front leg. So whenever

    only the back terminals are used, a preset acts as a fixed resistor. Presets are specified by

    their fixed value resistance.

    Fig 3.16: Preset

    3.3 COST ANALYSIS

    Name Cost (Unit Price)

    1. INTEGRATED CIRCUIT

    P89V51RD2 300/-

    7805 5/-

    2. SWITCH

    PUSH-TO-ON Switch 3/-

    3. DIODE

    1N4007 PN Diode 3/-

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 23

    4. CAPACITORS

    1000F 25V 5/

    33pF 1/

    47F 50V 2/-

    10F 40V 2/-

    5. RESISTORS

    8.2 K 0.50/-

    SIP-Resistor 10K 10/-

    6. CRYSTAL

    11.0592MHz 15/-

    7. TRANSFORMER 60/-

    8. LCD 280/-

    9. IR LED 50/-

    10. LED 2/-

    11. PRESET 10/-

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 24

    CHAPTER 4

    TESTING & PROBLEMS

    4.1 TESTING PROCEDURE

    First of all we do the continuity test to check whether there is any short circuit or not in our

    PCB. We dont apply the power supply to our circuit before testing, without power supply

    testing is called COLD Testing. We test all the components used in our project. A brief

    description is given below about testing procedure.

    In electronics, a continuity test is the checking of an electric circuit to see if current flows

    (that it is in fact a complete circuit). A continuity test is performed by placing a small

    voltage (wired in series with an LED or noise-producing component such as a piezoelectric

    speaker) across the chosen path. If electron flow is inhibited by broken conductors,

    damaged components, or excessive resistance, the circuit is "open". Devices that can be

    used to perform continuity tests include multi meters which measure current and

    specialized continuity testers which are cheaper, more basic devices, generally with a

    simple light bulb that lights up when current flows. Making sure something is

    not connected. Sometimes a solder joint will short two connections. Or maybe your PCB

    has mistaken on it and some traces were shorted by accident.

    Figure 4.1: Continuity Testing.

    This meter is very simple. When the probes are not touching, the display shows "1". When

    you touch the tips together, the display changes to a three digit mode (it's displaying

    resistance, which we will cover later) It also emits a beep. Set your meter to the

    continuity/diode "bleep" test. Connect the red meter lead to the base of the transistor.

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 25

    Connect the black meter lead to the emitter. A good NPN transistor will read a junction

    drop voltage of between 0.45v and 0.9v. A good PNP transistor will read "OL". Leave the

    red meter lead on the base and move the black lead to the collector. The reading should be

    the same as the previous test. Reverse the meter leads in your hands and repeat the test.

    Now connect the black meter lead to the base of the transistor. Connect the red meter lead

    to the emitter. A good PNP transistor will read a junction drop voltage of between 0.45v

    and 0.9v. A good NPN transistor will read "OL". Leave the black meter lead on the base

    and move the red lead to the collector. The reading should be the same as the previous test.

    Finally place one meter lead on the collector, the other on the emitter. The meter should

    read "OL". Reverse your meter leads. The meter should read "OL". This is the same for

    both NPN and PNP transistors. With the transistors on a pcb in circuit, you may not get an

    accurate reading, as other things in the circuit may affect it, so if you think a transistor is

    suspect from the readings you have got, remove it from the pcb and test it out of circuit,

    repeating the above procedure.

    4.2 TESTING FOR POWER SUPPLY

    Every component was checked for short circuit through multimeter.

    Power supply is given & the output of the various components is tested.

    Output of the transformer -9 volts A.C

    Output of the rectifier 9 volt D.C

    Output of the regulator 5 Volt D.C

    Output of the regulator with load - 4.80 Volt D.C

    4.3 PROBLEM FACED IN THE PROJECT

    While building the project, there were some problems faced:

    1. Testing of electronic components or circuit is very interesting work. In my project we

    dont faced any serious problem. By testing we got a shorted path in our circuit on PCB

    and there are 3-4 tracks which are broken during etching process. We joint these tracks by

    tinning.

    2. The first problem were soldering, it were not easy to solder the components on the PCB,

    so the method suggested by the guide were, to apply the solder mask.

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 26

    CHAPTER 5

    ADVANTAGES & APPLICATIONS

    5.1 ADVANTAGES

    The circuit is also running on +5V which is easier to generate.

    They reduce the risk of accidents.

    It is easy to implement.

    It reduce the effort of many men.

    5.2 DISADVANTAGES

    Sometimes the circuit got failure and causes various problems.

    5.3 APPLICATION

    Bridge construction.

    Highways.

    Two lane road construction.

    Emergency response.

    Event Traffic control.

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 27

    CONCLUSION

    The project SPEED CHECKER FOR HIGHWAYS has been successfully designed and

    tested. It has been developed by integrating features of all the hardware components used.

    Presence of every module has been reasoned out and placed carefully thus contributing to

    the best working of the unit. Secondly, using highly advanced ICs and with the help of

    growing technology the project has been successfully implemented. Finally we conclude

    that SPEED CHECKER FOR HIGHWAYS is an emerging field and there is a huge

    scope for research and development. It can be further advanced by using a CCTV camera

    in the circuit. Whenever any vehicle crosses speed limit, camera captures the image of

    number plate and through transport database finds the address of the owner and sends fine.

  • MAJOR PROJECT SPEED CHECKER ON HIGHWAY

    DEPARTMENT OF ELECTRONICS & COMMUNICATION 28

    BIBLIOGRAPHY

    1. http://www.engineersgarage.com/

    2. http://engineeringactivity.com/

    3. http://www.pantechsolutions.net/

    4. http://www.8051projects.net/

    5. http://www.dnatechindia.com/