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Wireless Notice Board 1

Dept. of Telecommunication Engg. SIT, Tumkur

INTRODUCTION


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Chapter 1

INTRODUCTION

Wireless systems are gaining popularity rapidly, as people attempt to do

away with complicate and confusing wiring operations. Using existing

radio wave frequencies, battery operated control panels allow for easier

operation and maintenance of the display system.

1.1 Wireless Notice Board

Wireless notice board is an enhanced technology used in order to save time

and convey the message with no delay. It provides a wireless data transfer

capability between the hex keypad and the notice board without the need of

wiring on through a radio frequency link.

This is a microcontroller based Embedded System which achieves wireless

interface between a hex keypad and a Notice board. Here a 16x2 alphanumeric

display can be used as the notice board .The user can type the messages to be

displayed in the remote LCD using the hex keypad and can be sent to the notice

board using the ZigBee module. The 8051 microcontroller (P89V51RD2)

based embedded system connected to the hex keypad receives the data typed

on it and sends it to the display system through the wireless link. At the displayside another 8051 microcontroller (P89V51RD2) based embedded system

receives the data through the ZigBee receiver and sends to the display side.

1.2 Need for Wireless Notice Board

Time saving: We can deliver the message instantly to any remote

destination and as it is displayed in general the time is saved.

Convenient: since the message is displayed in common it becomes

economical and the delay in the message delivery is avoided.


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Procedure:

y Determining the requirements of the embedded systemy Designing the system architecturey Choosing the processor and the associated peripheralsy Choosing the development platformy Coding the application and optimizing the codey Verification of the software on the host systemy Circuit Designingy PCB Layouty Device Testy Verification of the software on the target systemy

Documentation


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BLOCK DIAGRAM OF WNB


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Chapter 2

BLOCK DIAGRAM OF WNB

2.1 BLOCK DIAGRAM OF TRANSMITTER

Antenna

Figure 1 Transmitter and Power section

Power supply to all sect

Stepdown

T/F

BridgeRectifier

FilterCircuit

Regulator

MAX

232

8

0

C

5

1

16 X 2 LCD

CrystalReset

HEX

Key pad

Zigbee

Module


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2.2 BLOCK DIAGRAM OF RECEIVER

Antenna

Figure Receiver and Power section

P

ower supply to all sections

Step

down

T/F

Bridge

Rectifier

Filter

CircuitRegulator

MAX 232

8

0

C

5

1

16 X 2 LCD

Cr stal Reset

Zigbee

Module


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1.3 BLOCK DIAGRAM DESCRIPTION

Keypad:

This Keypad Mini Board includes 16 keys for Hex or standard Numeric Data Entry.Positive contact tactile switches are included in a standard matrix arrangement. An 8-bit data

bus is required for pulsing and monitoring the keys.

Pull-Up resistors are included, together with a standard easy to connect IDCC

connector for interfacing. This board can be used with any microcontroller, with each pin

separately polled or by using a series of interrupt pins to monitor the keys.

The Keypad Mini Board will work with any of our controllers and is an easy to use

solution for data entry or simply as a series of switches.

Features

* 16 Keys Included for Hex and Numeric Input

* Keys Arranged in Standard Matrix Format

* Pull-Up Resistors Included

* Standard IDCC connector for easy connection

* Compact and Easy To Mount

* Ideal for use with all our Development and Control Boards

* Board Dimensions: 45 x 55 mm

Microcontroller:

The microprocessor is the core of computer systems. Nowadays many

communication, digital entertainment, portable devices, are controlled by them. A designer

should know what types of components he needs, ways to reduce production costs and

product reliable. In this project we are using 8051 microcontroller.


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Alphanumeric Display (LCD):

LCD stands for Liquid Crystal Displays. "Liquid crystal" is neither solid nor liquid

(an example is soapy water).Liquid crystals when stimulated by an external electrical charge

will change the properties of light passing through the crystals. There are two ways toproduce a liquid-crystal image with such cells: the segment driving method and the matrix

driving method. The segment driving method displays characters and pictures with cells

defined by patterned electrodes. The matrix driving method displays characters and pictures

in sets of dots. In our project we are using 16x2 line matrix driven method display to display

our messages.

Transmitter:

Remote diagnosis ZigBee is a communications standard that provides a Wireless

autopilot control short-range cost effective networking capability. It has been developed

with the emphasis on low-cost battery National Marine Electronics powered applications,

such as, building automation, Association standard data industrial and commercial

controls, marine wireless, over ZigBee personal healthcare and advanced tagging. ZigBee

has been introduced by the IEEE and the ZigBee Alliance to security provide the first general

standard for these applications.

Receiver:

Remote diagnosis ZigBee is a communications standard that provides a Wireless

autopilot control short-range cost effective networking capability. It has been developed

with the emphasis on low-cost battery National Marine Electronics powered applications,

such as, building automation, Association standard data industrial and commercial

controls, marine wireless, over ZigBee personal healthcare and advanced tagging. ZigBee

has been introduced by the IEEE and the ZigBee Alliance to Security provide the first general

standard for these applications.

Power:

In this project the microcontroller requires +5v power supply. The designdescription

of power supply is given above.


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HARDWARE DETAILS


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Chapter 3

HARDWARE DETAILS

3.1 Alphanumeric Display (LCD)

In recent years the LCD is finding widespread use due to the following reasons:

1. The declining prices of LCDs.2. The ability to display numbers, characters and graphics.3. Incorporation of a refreshing controller into the LCD, thereby relieving the CPU of the

task of refreshing the LCD.

4. Ease of programming for characters and graphics.

Figure 3 LCD Interfacing to Microcontroller


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3.1.1 LCD Pin Descriptions

The LCD discussed in this section has 14 pins. The function of each pin is given in

Table 6.1.0. Figure 6.2a shows the pin positions for various LCDs.

Pin Symbol I/O Description

1 VSS -- Ground

2 VCC -- +5V power supply

3 VEE -- Power supply to control contrast

4 RS I RS=0 to select command register,

RS=1 to select data register

5 R/W I R/W=0 for write,

R/W=1 for read

6 E I/O Enable

7 DB0 I/O The 8-bit data bus








Table 1 Pin Descriptions for LCD

VCC, VSS and VEE

While VCC, and VSSprovide +5V and ground respectively, VEE is used for controlling

LCD contrast.

RS, Register select

There are two very important registers inside the LCD. The RS pin is used for their

selection as follows. If RS = 0, the instruction command code register is selected, allowing

the user to send a command such as clear display, cursor at home, etc. If RS = 1 the data

register is selected, allowing the user to send data to be displayed on the LCD.


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R/W, Read/Write

R/W input allows the user to write information to the LCD or read information from

it, R/W = 1 when reading : R/W = 0 when writing.

E, enableThe enable pin is used by the LCD to latch information presented to its data pins.

When data is supplied to data pins, a high-to-low pulse must be applied to this pin in order

for the LCD to latch in the data present at the data pins. This pulse must be a minimum of

450 ns wide.

Code (Hex) Command to LCD Instruction Register

1 Clear display screen

2 Return home

4 Decrement cursor (shift cursor to left)

6 Increment cursor (shift cursor to right)

5 Shift display right

7 Shift display left

8 Display off, cursor off

A Display off, cursor on

C Display on, cursor off

E Display on, cursor blinking

F Display on, cursor blinking

10 Shift cursor position to left

14 Shift cursor position to right

18 Shift the entire display to the left

1C Shift the entire display to the right

80 Force cursor to beginning of 1st line

C0 Force cursor to beginning of 2nd

line

Table 2 LCD Command Codes

D0 D7

The 8-bit data pins, D0 D7, are used to send information to the LCD or read the

contents of the LCDs internal registers.


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To display letters and numbers, we send ASCII codes for the letters A Z, a z and

number 0 9 to these pins while making RS = 1.

Figure 4-16 x 2 Character LCD Display

Table 3 List of LCD instructions

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3.1.2 Addressing Scheme of 2 x 16 LCD

The following table shows the addressing scheme of the 2 x 16 LCD screen.

80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F

C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF

Table 4 Addressing scheme of the 2 x 16 LCD screen

3.2 DB 9 CONNECTOR

Pin Description

1 Data Carrier Detect (DCD)

2 Received Data (RxD)

3 Transmitted Data (TxD)4 Data Terminal Ready (DTR)

5 Signal Ground (GND)

6 Data Set Ready (DSR)

7 Request to send (RTS)

8 Clear To Send (CTS)

9 Ring Indicator (RI)

Table 5 DB 9 pin description


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3.2.1. DTR (Data Terminal Ready)

When the terminal (or a PC COM port) is turned on, after going through a self-test, it

sends out signal DTR to indicate that it is ready for communication. If there is something

wrong with the COM port, this signal will not be activated.

3.2.2. DSR (Data Set Ready)

When DCE (modem) is turned on and has gone through the self-test, it asserts DSR to

indicate that it is ready to communicate. Thus, it is an output from the modem (DCE) and

input to the PC (DTE). This is an active low signal.

3.2.3. RTS (Request To Send)When the DTE device (such as a PC) has a byte to transmit, it asserts RTS to signal

the modem that it has a byte of data to transmit. RTS is an active-low output from the

DTE and an input to the modem.

3.2.4 CTS (Clear To Send)In response to RTS, when the modem has memory for storing the data it is to receive,

it sends out signal CTS to the DTE (PC) to indicate that it can receive the data now. This

input signal to the DTE is used by the DTE to start transmission. RTS and CTS are also

referred to as hardware control flow signals.

3.2.5. DCD (Carrier detect or Data Carrier Detect).

The modem asserts signal DCD to inform the DTE (PC) that a valid carrier has been

detected and that contact between it and the other modem is established. Therefore, DCD

is an output from the modem and an input to the PC (DTE).

3.2.6. RI (Ring Indicator).

An output from the modem (DCE) and an input to a PC (DTE) indicates that the

telephone is ringing. It goes on and off in synchronization with the ringing sound.


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3.2.7. RxD, TxD and GND.

RxD pin is used to receive data and TxD is used to transmit data serially. GND is the

ground connection for the cable.

3.3 8051 Microcontroller

3.3.1 General description

The P89V51RD2 is an 80C51 microcontroller with 64 KB Flash and 1024 bytes of

data RAM.

A key feature of the P89V51RD2 is its X2 mode option. The design engineer can

choose to run the application with the conventional 80C51 clock rate (12 clocks per machine

cycle) or select the X2 mode (6 clocks per machine cycle) to achieve twice the throughput at

the same clock frequency. Another way to benet from this feature

is to keep the same performance by reducing the clock frequency by half, thus dramatically

reducing the EMI.

The Flash program memory supports both parallel programming and in serial

In-System Programming(ISP). Parallel programming mode offers gang-programming at high

speed, reducing programming costs and time to market. ISP allows a device to be

reprogrammed in the end product under software control. The capability to eld/update the

application rmware makes a wide range of applications possible.

The P89V51RD2 is also In-Application Programmable (IAP), allowing the Flash

program memory to be recongured even while the application is running.


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Fig Pin Layout of AT89C51


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3.3.2 Features

1) 80C51 Central Processing Unit2) 5 V operating voltage from 0 to 40 MHz

3) 64 KB of on-chip Flash program memory with ISP (In-System Programming) and

IAP (In-Application Programming)

4) Supports 12-clock (default) or 6-clock mode selection via software or ISP

PCA (Programmable Counter Array) with PWM and Capture/Compare functions

5) Four 8-bit I/O ports with three high-current Port 1 pins (16 mA each)

6) Three 16-bit timers/counters

7) Programmable Watchdog timer (WDT)

8) Eight interrupt sources with four priority levels

9) Second DPTR register

10) Low EMI mode (ALE inhibit)

11) TTL- and CMOS-compatible logic levels

12) Brown-out detection

13) Low power modes

14) Power-down mode with external interrupt wake-up dle mode

15) PDIP40, PLCC44 and TQFP44 packages


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Figure Circuit Diagram


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Port 0

Port 0 is an 8-bit open-drain bi-directional I/O port. As an output port, each pin can

sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as high

impedance inputs. Port 0 may also be configured to be the multiplexed low order

address/data bus during accesses to external program and data memory. In this mode P0 has

internal pull-ups.Port 0 also receives the code bytes during Flash programming, and outputs

the code bytes during program verification. External pull-ups are required during program

verification. With external pull-up resistors connected upon reset, port 0 is configured as an

output port.

Figure 3.2 Port 0 with external pull-up resistors.

Port 1

Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 1 output

buffers can sink/source four TTL inputs. When 1s are written to Port 1 pins they are pulled

high by the internal pull-ups and can be used as inputs. As inputs, Port 1 pins that are

externally being pulled low will source current (IIL) because of the internal pull-ups. Port 1

also receives the low-order address bytes during Flash programming and verification.

Port 2





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externally being pulled low will source current (IIL) because of the internal pull-ups. Port 2

emits the high-order address byte during fetches from external program memory and during

accesses to external data memory that uses 16-bit addresses (MOVX @ DPTR). In this

application, it uses strong internal pull-ups when emitting 1s. During accesses to external

data memory that uses 8-bit addresses (MOVX @ RI); Port 2 emits the contents of the P2

Special Function Register. Port 2 also receives the high-order address bits and some control

signals during Flash programming and verification.

Port 3:




externally being pulled low will source current because of the pull-ups. Port 3 also serves the

functions of various special features of the AT89C51 as listed in table 3.1.


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Memory organization

The device has separate address spaces for program and data memory.

Flash program memory

There are two internal ash memory blocks in the device. Block 0 has 64 kbytes and contains

the users code. Block 1 contains the Philips-provided ISP/IAP routines and may be enabled

such that it overlays the rst 8 Kbytes of the user code memory. The 64 kB Block 0 is

organized as 512 sectors, each sector consists of 128 bytes. Access to the IAP routines may

be enabled by clearing the BSEL bit in the FCF register. However, caution must be taken

when dynamically changing the BSEL bit. Since this will cause different physical memory to

be mapped to the logical program address space, the user must avoid clearing the BSEL bit

when executing user code within the address range 0000H to 1FFFH.

Data RAM memory

The data RAM has 1024 bytes of internal memory. The device can also address up to 64 kB

for external data memory.

Expanded data RAM addressing

The P89V51RD2 has 1 kB of RAM.

The device has four sections of internal data memory:

1. The lower 128 bytes of RAM (00H to 7FH) are directly and indirectly addressable.

2. The higher 128 bytes of RAM (80H to FFH) are indirectly addressable.

3. The special function registers (80H to FFH) are directly addressable only.

4. The expanded RAM of 768 bytes (00H to 2FFH) is indirectly addressable by the move

external instruction (MOVX) and clearing the EXTRAM bit. Since the upper 128 bytes

occupy the same addresses as the SFRs, the RAM must be accessed indirectly. The RAM and

SFRs space are physically separate even though they have the same addresses.

When instructions access addresses in the upper 128 bytes (above 7FH), the MCU

determines whether to access the SFRs or RAM by the type of instruction given. If it is


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indirect, then RAM is accessed. If it is direct, then an SFR is accessed. See the examples

below.

Indirect Access:

MOV@R0, #data; R0 contains 90H.Register R0 points to 90H which is located in the upper

address range. Data in #data is written to RAM location 90H rather than port 1.

Direct Access:

MOV90H, #data; write data to P1. Data in #data is written to port 1. Instructions that write

directly to the address write to the SFRs. To access the expanded RAM, the EXTRAM bit

must be cleared and MOVX instructions must be used. The extra 768 bytes of memory is

physically located on the chip and logically occupies the rst 768 bytes of external memory

(addresses 000H to 2FFH). When EXTRAM = 0, the expanded RAM is indirectly addressed

using the MOVX instruction in combination with any of the registers R0, R1 of the selected

bank or DPTR. Accessing the expanded RAM does not affect ports P0, P3.6 (WR), P3.7

(RD), or P2. With EXTRAM = 0, the expanded RAM can be accessed as in the following

example. Expanded RAM Access (Indirect Addressing only): MOVX@DPTR, A DPTR

contains 0A0H DPTR points to 0A0H and data in A is written to address 0A0H of the

expanded RAM rather than external memory. Access to external memory higher than 2FFH

using the MOVX instruction will access external memory (0300H to FFFFH) and will

perform in the same way as the standard 8051, with P0 and P2 as data/address bus, and P3.6

and P3.7 as write and read timing signals. When EXTRAM = 1, MOVX @Ri and MOVX

@DPTR will be similar to the standard 8051. Using MOVX @Ri provides an 8-bit address

with multiplexed data on Port 0. Other output port pins can be used to output higher order

address bits. This provides external paging capabilities. Using MOVX @DPTR generates a

16-bit address. This allows external addressing up the 64 kB. Port 2 provides the high-order

eight address bits (DPH), and Port 0 multiplexes the low order eight address bits (DPL) withdata. Both MOVX @Ri and MOVX @DPTR generates the necessary read and write signals

(P3.6 - WR and P3.7 - RD) for external memory use. Table 7 shows external data memory

RD, WR operation with EXTRAM bit. The stack pointer (SP) can be located anywhere

within the 256 bytes of internal RAM (lower 128 bytes and upper 128 bytes). The stack

pointer may not be located in any part of the expanded RAM.


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Dual data pointers

This device has two 16-bit data pointers. The DPTR Select (DPS) bit in AUXR1

determines which of the two data pointers is accessed. When DPS = 0, DPTR0 is

selected; when DPS = 1, DPTR1 is selected. Quickly switching between the two data

pointers can be accomplished by a single INC instruction on AUXR1.

.


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3.3 HEX KEYPAD

Just arrived our new Keypad Mini Board, this board includes 16 keys for Hex or standard

Numeric Data Entry. Positive contact tactile switches are included in a standard matrix arrangement.

An 8-bit data bus is required for pulsing and monitoring the keys.

Pull-Up resistors are included, together with a standard easy to connect IDCC connector for

interfacing. This board can be used with any microcontroller, with each pin separately polled or by

using a series of interrupt pins to monitor the keys.

The Keypad Mini Board will work with any of our controllers and is an easy to use solution for data

entry or simply as a series of switches.


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Features:

* 16 Keys Included for Hex and Numeric Input

* Keys Arranged in Standard Matrix Format

* Pull-Up Resistors Included

* Standard IDCC connector for easy connection

* Compact and Easy To Mount

* Ideal for use with all our Development and Control Boards

* Board Dimensions: 45 x 55 mm


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3.5 ZigBee

3.5.1 About ZigBee

Remote diagnosis ZigBee is a communications standard that provides a wireless autopilot

control short-range cost effective networking capability. It has been developed with the

emphasis on low-cost battery National Marine Electronics powered applications, such as,

building automation, Association standard data industrial and commercial controls, marine

wireless, over ZigBee personal healthcare and advanced tagging. ZigBee has been introduced

by the IEEE and the ZigBee Alliance to provide security the first general standard for these

applications.

3.5.2 Benefits of ZigBee

With a tenth of the processor memory requirements of Lighting Bluetooth and a fraction of

the MIPS needed for 802.11 Fire and safety systems networking devices, ZigBee is the best

solution for low data rate, short-range communications.

3.5.3 ZigBee also offers

y Low power consumption optimized formaintenance logging battery operation.

y License free operation in the 2.4GHz band.y Simple protocol definition can be implemented onlow-cost microcontrollers.

y Hundreds of devices per network.

y Network flexibility Star, Cluster Tree or Mesh configuration.

y Data rate up to 250kbps

y A well proven and researched standard that has been developed by some of the mostexperiencedcompanies in the world.

y Small size the developed solution will be less than 9mm x 9mm.


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3.5.4 Example Applications

1) Water Level SensingZigBee can be installed in remote locations whereconventional GSM modems would be

out of their network coverage area, such as inside water tanks. ZigBee transceivers can be

hermetically sealed with batteries and co- located with the sensors. Each transceiver transmits

periodically to another unit installed above ground. A GSM modem transmits the data back to base.

2) In-building Control

ZigBee- enabled switches and lights can reduce installation costs in new buildings by

eliminating themeeting current ZigBee protocols. Need to route light control through the walls, and

remove the need to call in a qualified electrician whenswitches need to be relocated. Thermostats

and air-conditioning controls can also be placed anywhere, free of any wiring constraints.

C-COORDINATORS R-ROUTERS E-END DEVICES


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SOFTWARE SECTION


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Chapter 4

SOFTWARE SECTION


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MAX 232


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Chapter 5

MAX 232

Old PC's used 25 pin connectors but only about 9 pins were actually used so today most

connectors are only 9-pin. Each of the 9 pins usually connects to a wire. Besides the two

wires used for transmitting and receiving data, another pin (wire) is signal ground. The

voltage on any wire is measured with respect to this ground. Thus the minimum number

of wires to use for 2-way transmission of data is 3. Except that it has been known to work

with no signal ground wire but with degraded performance and sometimes with errors.

There are still more wires which are for control purposes (signaling) only and not

for sending bytes. All of these signals could have been shared on a single wire, but

instead, there is a separate dedicated wire for every type of signal. Some (or all) of these

control wires are called "modem control lines". Modem control wires are either in the

asserted state (on) of +12 volts or in the negated state (off) of -12 volts. One of these wires

is to signal the computer to stop sending bytes out the serial port cable. Conversely,

another wire signals the device attached to the serial port to stop sending bytes to the

computer. If the attached device is a modem, other wires may tell the modem to hang up

the telephone line or tell the computer that a connection has been made or that the

telephone line is ringing (someone is attempting to call in). See section Pin out and

Signals for more details.

Figure MAX232


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Since the RS232 is not compatible with todays micro processors and microcontroller, we

need a line driver (voltage converter) to convert the RS232 signals to TTL voltage level that

will be acceptable to the 8052s TxD and RxD pins. One example of such a converter is

MAX232. The MAX232 converts from RS232 voltage levels to TTL voltage levels and vice

versa. One advantage of MAX232 chip is that it uses +5V power source, which is the same

as the source voltage for the 8052.


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APPLICATIONS


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Chapter 6

APPLICATIONS

6.1 Uses in hospitals

As in the hospitals we have to keep track of so many things like management of the

resources and the scheduling of everyone and everything. There are different types of labs

and the devices for diagnosis of the different kinds of disease. By using this technology we

can make proper utilization of resources, timely and proper management of people without

any hassles.

6.2 Uses in Banks

There is a huge mass of population which depends upon the banks for all their

monetary transactions. To keep a proper track of such huge mass of people and their

transactions this technology helps with certain degree of effectiveness.

6.2 Uses for Traffic Control

Its known to all of us that traffic are the good servants of the people and also the

major invention to help people but only if it is managed well otherwise we all know

Bangalores traffic how ridiculous and irritating it can be. So with the use of this technology

we can maintain the flow of traffic according to the needs of the people and also considering

the availability of roads.

6.3 Uses for advertisement

We can make use of this technology to display the different advertisement on display

panels to reach the larger number of people at a time and in the populated places like

shopping malls, road sides as well as at the theaters, discos, hotels, motels, restaurants etc

about their products and features


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6.4 Uses in Educational sector

Currently in India we are relying on the old style of displaying news by hanging bare

time consuming papers on the notice board which can be replaced by remote controlled

notice boards at the colleges and universities, also at the time of examination scheduling and

result publishing.

6.5 Information purpose

It would be wiser to make a use of this technology for information purpose like news

and its updates, real time reporting, live telecasting, inclusive of various information which

adds to the advanced and busy life on daily basis.

6.6 Stock Exchange

The stock exchange is the hot topic nowadays. There are millions of sales of shares every

hours and it is very necessary to maintain the real time services with the certain measures of

reliability because it deals with the money large number of the small or bigger investors.

With the help of this technology we can make it far easier and reliable.

6.7 Organization

Every organization has large number of employees who are assigned to accomplish the

various tasks and each and everything should be documented for the future reference

purpose. And also their schedules work, reports, leaves, presentation as well as distribution

of salary etc


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ENHANCEMENTS


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Chapter 7

ENHANCEMENTS

This technology can be used for broader application with the help of further enhancements

such as

1) It can be used to cover a wider range by the use of effective RF transmitter andreceiver.

2) Even we can increase the size of LCD so that it will be more practical and advancedwith its various features like wireless communication, remote controlling and

monitoring.

3) As the RF Transmitters and Receivers are temperature sensitive we can make aproper use of them to overcome its sensitivity.

4) Even if we see in wider application we can use it for the display of symbols, signs andfigures which can be easily understood and followed by normal non technical and

general people, mean while it also aids to the time utilization as time is the most

important factor in daily lives

5) On the other hand we have got the freedom to make it as two way communicationmedium. Which adds to one of the essential further enhancement, as communication

and information interchange has become one of the essential tools for the researches

and innovations?

6) Even it has a scope of sending and receiving e-mails on this device, which gives awider view and application with the help of mobile.

As we see from the above discussion it has the wide and extensive further

enhancements which add to the wider application, deployment of information technology,

which can change the face of present communication system providing better services in

the communication field to the people and organization.


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CONCLUSION


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Chapter 8

CONCLUSION

Form this article we conclude implementing Wireless Notice Board that:-

1) It eliminates the use of aprinter.

2) It isuser friendly i.e., any layman can operate it.

3) Messages can be sentanytime & correctedinstantaneously.

4) Messages lasts until the power in switched off.

5) Finally the cost of module comes in very low cost.


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BIBLIOGRAPHY


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Chapter 9

BIBLIOGRAPHY

1.DESIGN WITH PIC MICROCONTROLLERS - JOHN.B.PEATMAN

2. ANALOG ANDDIGITAL COMMUNICATION - SIMON HAYKINS

3. EMBEDDED SYSTEM DESIGN - FRANK VAHID & TONY GIVARGIS

WEBSITES

www.microchip.com

www.laipac.com

www.howstuffworks.com

www.u2.semiconductors.philips.com/i2c/facts/www.wikipedia.com

www.kartoo.com

www.google.com

[6]report body

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