WIRELESS STEPPER MOTOR CONTROLLER

Auto mute car audio deckaudio system while talking on mobile phoneA PROJECT REPORT ON

Auto mute car audio deckaudio system while talking on mobile phoneSubmitted in partial fulfillment of the requirements

For the award of the degree

BACHELOR OF TECHNOLOGY

IN

____________________________________ ENGINEERING

SUBMITTED BY

-------------------- (-------------)

--------------------- (-------------)

--------------------- (------------)

DEPARTMENT OF _______________________ ENGINEERING

__________COLLEGE OF ENGINEERING

AFFILIATED TO ___________ UNIVERSITYCERTIFICATE

This is to certify that the dissertation work entitled Object Counter Using IR sensor is the work done by ____________________________ submitted in partial fulfillment for the award of BACHELOR OF ENGINEERING (B.E) in Electronics and Communication Engineering from _______ College of Engineering affiliated to _________ University, Hyderabad. ________________ ____________

(External Guide)

(Internal Guide)

______________

(External Examiner)

ACKNOWLEDGEMENT

The satisfaction and euphoria that accompany the successful completion of any task would be incomplete without the mentioning of the people whose constant guidance and encouragement made it possible. We take pleasure in presenting before you, our project, which is result of studied blend of both research and knowledge.

We express our earnest gratitude to our internal guide, Assistant Professor ______________, Department of ECE, our project guide, for his constant support, encouragement and guidance. We are grateful for his cooperation and his valuable suggestions.

We express our thanks to the Head of the Department, Principal and College management for all their support and encouragement.

We express our earnest gratitude and heartfelt thanks to M/S Wine Yard Technologies for their technical support and guidance to complete the project in time.

Finally, we express our gratitude to all other members who are involved either directly or indirectly for the completion of this project.

For: Project Associates

DECLARATION

We, the undersigned, declare that the project entitled Auto mute car audio deckaudio system while talking on mobile phone , being submitted in partial fulfillment for the award of Bachelor of Engineering Degree in Electronics and Communication Engineering, affiliated to _________ University, is the work carried out by us.

__________ _________ _________

__________ _________ _________INDEX

Technical Specifications

Project Abstract

Project Block Diagram

Introduction Basic components

AT89S52 Microcontroller Regulated Power Supply

LDR Buzzer

Software Tools

Keil Compiler

Proload Flash Working procedure

Applications

Conclusion

Reference

Technical specifications: Title of the project

: Object counter using IR sensorDomain

:Embedded Systems Design

Software

:Embedded C, Keil, ProloadMicrocontroller

:AT89S52

Power Supply

:+5V, 1A Regulated Power Supply

Sensor

:LDRTechnical support

:M/S Wine Yard Technologies

Phone

:040-6464 6363, www.wineyard.inABSTRACT:Muting cars audio deck, while talking on cell phone is an important yet difficult task. This project is designed to solve the problem. A sensitive LDR and LED is designed and fixed to a cell phone holder. Always the cell phone should be placed in the holder.

The transmitter unit continuously transmits light rays. These rays are interrupted by the cell phone. Whenever the cell phone is lifted from the holder, the rays fall on the receiver and it sends a signal to microcontroller. Here we are using AT89S52 as our controller which is heart of the entire system. So that our controller switches off the music system (here we are indicating as buzzer). Also an LED is also interfaced for the purpose of indication.

After the completion of the conservation, the cell phone should be kept back in the holder. Again the rays will be interrupted and the relay will be de-energized. Music will be played again normally.

This project uses regulated 5V, 500mA power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/18V step down transformerBLOCK DIAGRAM:

Power supply sectionINTRODUCTION

An embedded system is a combination of software and hardware to perform a dedicated task. Some of the main devices used in embedded products are Microprocessors and Microcontrollers.

Microprocessors are commonly referred to as general purpose processors as they simply accept the inputs, process it and give the output.

In contrast, a microcontroller not only accepts the data as inputs but also manipulates it, interfaces the data with various devices, controls the data and thus finally gives the result.

BASIC COMPONENTS

RESISTOR:

Resistors "Resist" the flow of electrical current. The higher the value of resistance (measured inohms) the lower the current will be.Resistance is the property of a component whichrestricts the flow of electric current. Energy is used up as the voltage across the component drives the current through it and this energy appears as heat in the component.

Color Code:

CAPACITOR:

Capacitors store electric charge. They are used with resistors intimingcircuitsbecause it takes time for a capacitor to fill with charge. They are used tosmoothvarying DC supplies by acting as a reservoir of charge. They are also used in filter circuits because capacitors easily pass AC (changing) signals but they block DC (constant) signals.

Circuit symbol: Electrolytic capacitors are polarized andthey must be connected the correct way round, at least one of their leads will be marked + or -.

Examples: DIODES:

Diodes allow electricity to flow in only one direction. The arrow of the circuit symbol shows the direction in which the current can flow. Diodes are the electrical version of a valve and early diodes were actually called valves.

Circuit symbol: Diodes must be connected the correct way round, the diagram may be labeledaor+for anode andkor-for cathode (yes, it really is k, not c, for cathode!). The cathode is marked by a line painted on the body. Diodes are labeled with their code in small print; you may need a magnifying glass to read this on small signal diodes.

Example:

LIGHT-EMITTING DIODE (LED):

The longer lead is the anode (+) and the shorter lead is the cathode (&minus). In the schematic symbol for an LED (bottom), the anode is on the left and the cathode is on the right. Light

emitting diodes are elements for light signalization in electronics.

They are manufactured in different shapes, colors and sizes. For their low price, low consumption and simple use, they have almost completely pushed aside other light sources- bulbs at first place.

It is important to know that each diode will be immediately destroyed unless its current is limited. This means that a conductor must be connected in parallel to a diode. In order to correctly determine value of this conductor, it is necessary to know diodes voltage drop in forward direction, which depends on what material a diode is made of and what colors it is. Values typical for the most frequently used diodes are shown in table below: As seen, there are three main types of LEDs. Standard ones get full brightness at current of 20mA. Low Current diodes get full brightness at ten times lower current while Super Bright diodes produce more intensive light than Standard ones.

Since the 8051 microcontrollers can provide only low input current and since their pins are configured as outputs when voltage level on them is equal to 0, direct confectioning to LEDs is carried out as it is shown on figure (Low current LED, cathode is connected to output pin). Switches and Pushbuttons: A push button switch is used to either close or open an electrical circuit depending on the application. Push button switches are used in various applications such as industrialequipmentcontrol handles, outdoor controls, mobile communication terminals, and medical equipment, and etc. Push button switches generally include a push button disposed within a housing. The push button may be depressed to cause movement of the push button relative to the housing for directly or indirectly changing the state of an electrical contact to open or close the contact. Also included in a pushbutton switch may be an actuator, driver, or plunger of some type that is situated within a switch housing having at least two contacts in communication with an electrical circuit within which the switch is incorporated.

Typical actuators used for contact switches include spring loaded force cap actuators that reciprocate within a sleeve disposed within the canister. The actuator is typically coupled to the movement of the cap assembly, such that the actuator translates in a direction that is parallel with the cap. A push button switch for a data input unit for a mobile communication device such as a cellular phone, a key board for apersonal computeror the like is generally constructed by mounting a cover member directly on a circuit board. Printed circuit board (PCB) mounted pushbutton switches are an inexpensive means of providing an operator interface on industrial control products. In such push button switches, a substrate which includes a plurality of movable sections is formed of arubberelastomeric. The key top is formed on a top surface thereof with a figure, a character or the like by printing, to thereby provide a cover member. Push button switches incorporating lighted displays have been used in a variety of applications. Such switches are typically comprised of a pushbutton, an opaque legend plate, and a back light to illuminate the legend plate.MICROCONTROLLERS:

Microprocessors and microcontrollers are widely used in embedded systems products. Microcontroller is a programmable device. A microcontroller has a CPU in addition to a fixed amount of RAM, ROM, I/O ports and a timer embedded all on a single chip. The fixed amount of on-chip ROM, RAM and number of I/O ports in microcontrollers makes them ideal for many applications in which cost and space are critical.

The Intel 8052 is a Harvard architecture, single chip microcontroller (C) which was developed by Intel in 1980 for use in embedded systems. It was popular in the 1980s and early 1990s, but today it has largely been superseded by a vast range of enhanced devices with 8052-compatible processor cores that are manufactured by more than 20 independent manufacturers including Atmel, Inferno Technologies and Maxim Integrated Products.

8052 is an 8-bit processor, meaning that the CPU can work on only 8 bits of data at a time. Data larger than 8 bits has to be broken into 8-bit pieces to be processed by the CPU. 8052 is available in different memory types such as UV-EPROM, Flash and NV-RAM.

The microcontroller used in this project is AT89S52. Atmel Corporation introduced this 89S52 microcontroller. This microcontroller belongs to 8052 family. This microcontroller had 128 bytes of RAM, 4K bytes of on-chip ROM, two timers, one serial port and four ports (each 8-bits wide) all on a single chip. AT89S52 is Flash type 8052.

The present project is implemented on Keil Uvision. In order to program the device, Proload tool has been used to burn the program onto the microcontroller.

The features, pin description of the microcontroller and the software tools used are discussed in the following sections.FEATURES OF AT89S52:

4K Bytes of Re-programmable Flash Memory.

RAM is 128 bytes.

2.7V to 6V Operating Range.

Fully Static Operation: 0 Hz to 24 MHz.

Two-level Program Memory Lock.

128 x 8-bit Internal RAM.

32 Programmable I/O Lines.

Two 16-bit Timer/Counters.

Six Interrupt Sources.

Programmable Serial UART Channel.

Low-power Idle and Power-down Modes.Description:

The AT89S52 is a low-voltage, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash programmable memory. The device is manufactured using Atmels high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcomputer, which provides a highly flexible and cost-effective solution to many embedded control applications.

In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.

Fig: Pin diagram

Fig: Block diagramPIN DESCRIPTION:

Vcc

Pin 40 provides supply voltage to the chip. The voltage source is +5V.

GND

Pin 20 is the ground.XTAL1 and XTAL2

XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier that can be configured for use as an on-chip oscillator, as shown in Figure 11. Either a quartz crystal or ceramic resonator may be used. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven, as shown in the below figure. There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low time specifications must be observed.

Fig: Oscillator ConnectionsC1, C2 = 30 pF 10 pF for Crystals

= 40 pF 10 pF for Ceramic ResonatorsFig: External Clock Drive Configuration

RESET

Pin9 is the reset pin. It is an input and is active high. Upon applying a high pulse to this pin, the microcontroller will reset and terminate all the activities. This is often referred to as a power-on reset.

EA (External access)

Pin 31 is EA. It is an active low signal. It is an input pin and must be connected to either Vcc or GND but it cannot be left unconnected.

The 8052 family members all come with on-chip ROM to store programs. In such cases, the EA pin is connected to Vcc. If the code is stored on an external ROM, the EA pin must be connected to GND to indicate that the code is stored externally.PSEN (Program store enable)

This is an output pin.

ALE (Address latch enable)

This is an output pin and is active high.Ports 0, 1, 2 and 3

The four ports P0, P1, P2 and P3 each use 8 pins, making them 8-bit ports. All the ports upon RESET are configured as input, since P0-P3 have value FFH on them.

Port 0(P0)

Port 0 is also designated as AD0-AD7, allowing it to be used for both address and data. ALE indicates if P0 has address or data. When ALE=0, it provides data D0-D7, but when ALE=1, it has address A0-A7. Therefore, ALE is used for demultiplexing address and data with the help of an internal latch.

When there is no external memory connection, the pins of P0 must be connected to a 10K-ohm pull-up resistor. This is due to the fact that P0 is an open drain. With external pull-up resistors connected to P0, it can be used as a simple I/O, just like P1 and P2. But the ports P1, P2 and P3 do not need any pull-up resistors since they already have pull-up resistors internally. Upon reset, ports P1, P2 and P3 are configured as input ports.

Port 1 and Port 2

With no external memory connection, both P1 and P2 are used as simple I/O. With external memory connections, port 2 must be used along with P0 to provide the 16-bit address for the external memory. Port 2 is designated as A8-A15 indicating its dual function. While P0 provides the lower 8 bits via A0-A7, it is the job of P2 to provide bits A8-A15 of the address.Port 3

Port 3 occupies a total of 8 pins, pins 10 through 17. It can be used as input or output. P3 does not need any pull-up resistors, the same as port 1 and port 2. Port 3 has an additional function of providing some extremely important signals such as interrupts.

Table: Port 3 Alternate Functions

Machine cycle for the 8052The CPU takes a certain number of clock cycles to execute an instruction. In the 8052 family, these clock cycles are referred to as machine cycles. The length of the machine cycle depends on the frequency of the crystal oscillator. The crystal oscillator, along with on-chip circuitry, provides the clock source for the 8052 CPU.

The frequency can vary from 4 MHz to 30 MHz, depending upon the chip rating and manufacturer. But the exact frequency of 11.0592 MHz crystal oscillator is used to make the 8052 based system compatible with the serial port of the IBM PC.

In the original version of 8052, one machine cycle lasts 12 oscillator periods. Therefore, to calculate the machine cycle for the 8052, the calculation is made as 1/12 of the crystal frequency and its inverse is taken.The assembly language program is written and this program has to be dumped into the microcontroller for the hardware kit to function according to the software. The program dumped in the microcontroller is stored in the Flash memory in the microcontroller. Before that, this Flash memory has to be programmed and is discussed in the next section.

PROGRAMMING THE FLASH:

The AT89S52 is normally shipped with the on-chip Flash memory array in the erased state (that is, contents = FFH) and ready to be programmed. The programming interface accepts either a high-voltage (12-volt) or a low-voltage (VCC) program enable signal. The low-voltage programming mode provides a convenient way to program the AT89S52 inside the users system, while the high-voltage programming mode is compatible with conventional third party Flash or EPROM programmers. The AT89S52 is shipped with either the high-voltage or low-voltage programming mode enabled. The respective top-side marking and device signature codes are listed in the following table.

The AT89S52 code memory array is programmed byte-byte in either programming mode. To program any nonblank byte in the on-chip Flash Memory, the entire memory must be erased using the Chip Erase Mode.Programming Algorithm:

Before programming the AT89S52, the address, data and control signals should be set up according to the Flash programming mode table. To program the AT89S52, the following steps should be considered:1. Input the desired memory location on the address lines.

2. Input the appropriate data byte on the data lines.

3. Activate the correct combination of control signals.

4. Raise EA/VPP to 12V for the high-voltage programming mode.

5. Pulse ALE/PROG once to program a byte in the Flash array or the lock bits. The byte-write cycle is self-timed and typically takes no more than 1.5 ms.

Repeat steps 1 through 5, changing the address and data for the entire array or until the end of the object file is reached.

Data Polling:

The AT89S52 features Data Polling to indicate the end of a write cycle. During a write cycle, an attempted read of the last byte written will result in the complement of the written datum on PO.7. Once the write cycle has been completed, true data are valid on all outputs, and the next cycle may begin. Data Polling may begin any time after a write cycle has been initiated.Ready/Busy: The progress of byte programming can also be monitored by the RDY/BSY output signal. P3.4 is pulled low after ALE goes high during programming to indicate BUSY. P3.4 is pulled high again when programming is done to indicate READY.

Chip Erase:

The entire Flash array is erased electrically by using the proper combination of control signals and by holding ALE/PROG low for 10 ms. The code array is written with all 1s. The chip erase operation must be executed before the code memory can be re-programmed.Reading the Signature Bytes:

The signature bytes are read by the same procedure as a normal verification of locations 030H, 031H, and 032H, except that P3.6 and P3.7 must be pulled to a logic low. The values returned are as follows.(030H) = 1EH indicates manufactured by Atmel

(031H) = 51H indicates 89S52(032H) = FFH indicates 12V programming

(032H) = 05H indicates 5V programming

Programming Interface:Every code byte in the Flash array can be written and the entire array can be erased by using the appropriate combination of control signals. The write operation cycle is self timed and once initiated, will automatically time itself to completion. All major programming vendors offer worldwide support for the Atmel microcontroller series.

Fig: Flash Programming Modes

Fig: Programming the Flash

Fig: Verifying the Flash

POWER SUPPLY:

The input to the circuit is applied from the regulated power supply. The a.c. input i.e., 230V from the mains supply is step down by the transformer to 12V and is fed to a rectifier. The output obtained from the rectifier is a pulsating d.c voltage. So in order to get a pure d.c voltage, the output voltage from the rectifier is fed to a filter to remove any a.c components present even after rectification. Now, this voltage is given to a voltage regulator to obtain a pure constant dc voltage.

Fig: Power supplyTransformer:

Usually, DC voltages are required to operate various electronic equipment and these voltages are 5V, 9V or 12V. But these voltages cannot be obtained directly. Thus the a.c input available at the mains supply i.e., 230V is to be brought down to the required voltage level. This is done by a transformer. Thus, a step down transformer is employed to decrease the voltage to a required level.

Rectifier:

The output from the transformer is fed to the rectifier. It converts A.C. into pulsating D.C. The rectifier may be a half wave or a full wave rectifier. In this project, a bridge rectifier is used because of its merits like good stability and full wave rectification.

Filter:

Capacitive filter is used in this project. It removes the ripples from the output of rectifier and smoothens the D.C. Output received from this filter is constant until the mains voltage and load is maintained constant. However, if either of the two is varied, D.C. voltage received at this point changes. Therefore a regulator is applied at the output stage.

Voltage regulator:

As the name itself implies, it regulates the input applied to it. A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level. In this project, power supply of 5V and 12V are required. In order to obtain these voltage levels, 7805 and 7812 voltage regulators are to be used. The first number 78 represents positive supply and the numbers 05, 12 represent the required output voltage levels.

LIGHT DEPENDENT RESISTOR

Aphoto resistororlight dependent resistor(LDR) is aresistorwhoseresistancedecreases with increasing incident light intensity. It can also be referred to as aphotoconductoror CdS device (from "cadmium sulfide," which is the material from which the device is made and that actually exhibits the variation in resistance with light level. Note that CdS is not a semiconductor in the usual sense of the word (not doped silicon).)

A photo resistor is made of a high resistancesemiconductor. If light falling on the device is of high enoughfrequency,photonsabsorbed by the semiconductor give boundelectronsenough energy to jump into theconduction band. The resulting free electron (and itsholepartner) conduct electricity, thereby lower in resistance.

A photoelectric device can be either intrinsic or extrinsic. An intrinsic semiconductor has its owncharge carriersand is not an efficient semiconductor, e.g. silicon. In intrinsic devices the only available electrons are in thevalence band, and hence the photon must have enough energy to excite the electron across the entireband gap. Extrinsic devices have impurities, also calleddopants, added whose ground state energy is closer to the conduction band; since the electrons do not have as far to jump, lower energy photons (i.e., longer wavelengths and lower frequencies) are sufficient to trigger the device. If a sample of silicon has some of its atoms replaced by phosphorus atoms (impurities), there will be extra electrons available for conduction. This is an example of an extrinsic semiconductor.

Applications:

Photo resistors come in many different types. Inexpensivecadmium sulfidecells can be found in many consumer items such as camera light meters, street lights, clock radios,alarm devices, and outdoor clocks.

They are also used in somedynamic compressorstogether with a smallincandescent lamporlight emitting diodeto control gain reduction.

Lead sulfide(PbS) andindium antimonide(InSb) LDRs (light dependent resistor) are used for the mid infrared spectral region.Ge:Cuphotoconductors are among the best far-infrareddetectors available, and are used forinfrared astronomyandinfrared spectroscopy.

Possible circuits

There are just two ways of constructing the voltage divider, with the LDR at the top, or with the LDR at the bottom:

You are going to investigate the behaviour of these two circuits. You will also find out how to choose a sensible value for the fixed resistor in a voltage divider circuit.

Remember the formula for calculatingVout:

LIGHT DEPENDENT RESISTOR:

LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1,000,000 ohms, but when they are illuminated with light, the resistance drops dramatically.

Thus in this project, LDR plays an important role in controlling the electrical appliances based on the intensity of light i.e., if the intensity of light is more (during daytime) the loads will be in off condition. And if the intensity of light is less (during nights), the loads will be switched ON.LDR:

LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1000 000 ohms, but when they are illuminated with light resistance drops dramatically.

When the light level is low the resistance of the LDR is high. This prevents current from flowing to the base of the transistors. Consequently the LED does not light.

However, when light shines onto the LDR its resistance falls and current flows into the base of the first transistor and then the second transistor. The LED lights.

Here in our project to avoid the light from led to fall on to LDR we place a box in which we will keep our jewelry. If any one removes the box the light from led falls directly on to the LDR and then the transistor will be on which is monitored by the microcontroller.

Two cadmium sulphide (cds) photoconductive cells with spectral responses similar to that of the human eye. The cell resistance falls with increasing light intensity. Applications include smoke detection, automatic lighting control, batch counting and burglar alarm systems.

LDR Applications: Photoconductive cells are used in many different types of circuits and applications.

Analog Applications :

Camera Exposure Control

Auto Slide Focus - dual cell

Photocopy Machines - density of toner

Colorimetric Test Equipment

Densitometer

Electronic Scales - dual cell

Automatic Gain Control modulated light source

Automated Rear View Mirror

Digital Applications :

Automatic Headlight Dimmer

Night Light Control

Oil Burner Flame Out

Street Light Control

Absence / Presence (beam breaker)

Position Sensor

BuzzerWhat does it do?

The buzzer subsystem produces an audible tone when powered.

How does it operate?

Buzzer circuit. Buzzers come in a variety of voltages and currents. The power supply for the buzzer (which can be separate from the supply for the rest of the electronics) must provide the voltage needed by the buzzer.

Piezo sounders are a type of buzzer. They should not be confused with Piezo transducers which require an a.c. input voltage to drive them.

Some process units provide enough current to drive buzzers. Typical buzzers require currents in the range 10 35mA.

If CMOS ICs or a higher current buzzer are used then a driver (transistor, Darlington or MOFET) is needed to boost the current. The circuit on the left shows the circuit needed with a driver.

Buzzer curcuit for use with higher current process units. PICs, 555 Timer ICs and the LM324 op-amp can provide higher currents and can drive some buzzers directly.

Check the data for the buzzer and the process unit to make sure that the process unit can provide more current than is needed by the buzzer.

If this is possible, the buzzer is connected to the 0V rail (as on the left) rather than to +Vs.

Buzzers can either be PCB-mounted or connected to the circuit with flying leads. Usually it is neater to mount them on the PCB.

Applications

Making a warning sound

Signalling that something has happened

Making

Buzzers have a positive and a negative terminal, marked on their case. The positive terminal should be connected to the positive voltage supply. The negative terminal should be connected to the signal from the driver.

The graphic on the left shows how part of the PCB might look for a PCB-mounted buzzer connected to a driver.

How part of the PCB might look

If a buzzer with flying leads is used then a terminal block is mounted on the PCB and wires from this are connected to the buzzer.

Build and test the unit that will provide the driving input signal before adding the buzzer.

Testing

Make sure that the buzzer switches on and off as power is applied from the driver unit.

Working with KEIL

Working with KEIL:

INTRODUCTION TO KEIL SOFTWARE ABOUT KEIL:

1. Click on the Keil u Vision Icon on Desktop

2. The following fig will appear

3. Click on the Project menu from the title bar

4. Then Click on New Project

5. Save the Project by typing suitable project name with no extension in u r own folder sited in either C:\ or D:\

6. Then Click on Save button above.

7. Select the component for u r project. i.e. Atmel

8. Click on the + Symbol beside of Atmel

9. Select AT89C51 as shown below

10. Then Click on OK

11. The Following fig will appear

12. Then Click either YES or NOmostly NO

13. Now your project is ready to USE

14. Now double click on the Target1, you would get another option Source group 1 as shown in next page.

15. Click on the file option from menu bar and select new

16. The next screen will be as shown in next page, and just maximize it by double clicking on its blue boarder.

17. Now start writing program in either in C or ASM

18. For a program written in Assembly, then save it with extension . asm and for C based program save it with extension .C

19. Now right click on Source group 1 and click on Add files to Group Source

20. Now you will get another window, on which by default C files will appear.

20. Now select as per your file extension given while saving the file

21. Click only one time on option ADD

22. Now Press function key F7 to compile. Any error will appear if so happen.

23. If the file contains no error, then press Control+F5 simultaneously.

24. The new window is as follows

25. Then Click OK

26. Now Click on the Peripherals from menu bar, and check your required port as shown in fig below

27. Drag the port a side and click in the program file.

28. Now keep Pressing function key F11 slowly and observe.

29. You are running your program successfully

PROLOAD:

Proload is a software which accepts only hex files. Once the machine code is converted into hex code, that hex code has to be dumped into the microcontroller placed in the programmer kit and this is done by the Proload. Programmer kit contains a microcontroller on it other than the one which is to be programmed. This microcontroller has a program in it written in such a way that it accepts the hex file from the keil compiler and dumps this hex file into the microcontroller which is to be programmed. As this programmer kit requires power supply to be operated, this power supply is given from the power supply circuit designed above. It should be noted that this programmer kit contains a power supply section in the board itself but in order to switch on that power supply, a source is required. Thus this is accomplished from the power supply board with an output of 12volts or from an adapter connected to 230 V AC.

1. Install the Proload Software in the PC.

2. Now connect the Programmer kit to the PC (CPU) through serial cable.

3. Power up the programmer kit from the ac supply through adapter.

4. Now place the microcontroller in the GIF socket provided in the programmer kit.

5. Click on the Proload icon in the PC. A window appears providing the information like Hardware model, com port, device type, Flash size etc. Click on browse option to select the hex file to be dumped into the microcontroller and then click on Auto program to program the microcontroller with that particular hex file.

6. The status of the microcontroller can be seen in the small status window in the bottom of the page.After this process is completed, remove the microcontroller from the programmer kit and place it in your system board. Now the system board behaves according to the program written in the microcontroller.

WORKING PROCEDURE:1. Power up the entire system by using 230V step down T/F

2. The output of the T/F (18V) is given to the bridge rectifier.

3. The output of the bridge rectifier is give to filter circuit to get pure DC.

4. But the system works for 5V dc for that we require 7805 a voltage regulator.

5. The output of the voltage regulator is used to drive the LDR, relay based driver and the Music system (FM).

6. Whenever a mobile is placed between White Led and LDR, music system will gets on automatically.

7. If once the mobiles gets ON (Ringing) automatically Music system turns OFF.

Advantages:

Durability

Low maintenance

Fit and Forget system

Highly sensitive

Low cost

Simple and Reliable circuit

Safety

Can enjoy music with out disturbance

Wide ambient temperature range

Applications:

Vehicles

Smoke detection

Automatic lighting control

Batch counting

Burglar alarm systems

CONCLUSION

This project presents a Auto Mute for Car Audio Deck Experimental work has been carried out carefully. The result shows that higher efficiency is indeed achieved using their Led transmitter and LDR. The proposed method is verified to be highly beneficial for the purpose of automatic control of audio system in car.REFERENCES

www.howstuffworks.com

Magazines:

Electronics for you

ElectrikindiaPower supply

LED

AT89S52

MCU

Current driver

Buzzer

LDR

LED indicator

Reset switch

Crystal oscillator

Power on Reset

230V AC

50Hz

D.C Output

Regulator

Filter

Bridge Rectifier

Step down transformer

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