TOKEN NUMBER DISPLAY & MANAGEMENT FOR BANKS

INTRODUCTION

EMBEDDED SYSTEM• embedded system is a special-purpose system in

which the computer is completely encapsulated by or dedicated to the deviceor system it controls

• Embedded system performs one or a few predefined tasks, usually with very specific requirements.

• Since the system is dedicated to specific tasks, design engineers can optimize it, reducing the size and cost of the product.

PHYSICAL APPEARANCE

Physically, embedded systems ranges from portable devices such as digital watches and MP3 players, to large stationary installations like traffic lights, factory controllers, or the systems controlling nuclear power plants.

COMPLEXITY

In terms of complexity embedded systems can range from very simple with a single microcontroller chip, to very complex with multiple units, peripherals and networks mounted inside a large chassis or enclosure.

EXAMPLE OF EMBEDDED SYSTEM

EXAMPLES

Handheld calculatorsHandheld computersPersonal digital assistantVideogame consolesComputer peripherals such as

routers and printers.Industrial controllers for remote

machine operation.

Block diagram-TOKEN NUMBER DISPLAY

Components: Power supply Microcontroller LCD Token allotting system Indication at cabins

 

POWER SUPLLY In this system we are using 5V power supply for

Microcontroller of Transmitter section as well as receiver section.

TRANSFORMER

A transformer is an electrical device, which is used to convert electrical power from one Electrical circuit to another without change in frequency.

An Electrical Transformer

RECTIFIERTYPES OF RECTIFIERS. Half wave Rectifier Full wave rectifier

FILTERS A Filter is a device, which removes the a.c component

of rectifier output but allows the d.c component to reach the load.

Capacitor FilterA capacitor, in parallel to the load, provides an easier by –pass

for the ripples voltage though it due to low impedance. At ripple frequency and leave the D.C. to appear at the load.

An inductor, in series with the load, prevents the passage of the ripple current (due to high impedance at ripple frequency) while allowing the D.C (due to low resistance to D.C).

Regulator:

Voltage regulator ICs is available with fixed (typically 5, 12 and 15V) or variable output voltages. The maximum current they can pass also rates them. Negative voltage regulators are available, mainly for use in dual supplies. Most regulators include some automatic protection from excessive current ('overload protection') and overheating ('thermal protection'). Many of the fixed voltage regulators ICs have 3 leads and look like power transistors, such as the 7805 +5V 1A regulator shown on the right. The LM7805 is simple to use. You simply connect the positive lead of your unregulated DC power supply (anything from 9VDC to 24VDC) to the Input pin, connect the negative lead to the Common pin and then when you turn on the power, you get a 5 volt supply from the output pin.

TYPICAL REGULATOR

Liquid Crystal Display In recent years the LCD is finding widespread use

replacing LED s (seven-segment LED or other multi segment LED s). This is due to the following reasons:

The declining prices of LCD s. The ability to display numbers, characters and

graphics. This is in contract to LED s, which are limited to numbers and a few characters.

Incorporation of a refreshing controller into the LCD, there by relieving the CPU of the task of refreshing the LCD. In the contrast, the LED must be refreshed by the CPU to keep displaying the data.

Ease of programming for characters and graphics.

TYPICAL LCD SCREEN

Specifications

Number of Characters: 16 characters x 2 Lines Character Table: English-European (RS in Datasheet) Module dimension: 80.0mm x 36.0mm x 13.2mm(MAX) View area: 66.0 x 16.0 mm Active area: 56.2 x 11.5 mm Dot size: 0.56 x 0.66 mm Dot pitch: 0.60 x 0.70 mm Character size: 2.96 x 5.46 mm Character pitch: 3.55 x 5.94 mm LCD type: STN, Positive, Transflective , Yellow/Green Duty: 1/16 View direction: Wide viewing angle Backlight Type: yellow/green LED RoHS Compliant: lead free Operating Temperature: -20°C to + 70°C

LCD PIN DIAGRAM

LCD INTERFACING

MICRO CONTROLLER (AT89S51)

A Micro controller consists of a powerful CPU tightly coupled with memory, various I/O interfaces such as serial port, parallel port timer or counter, interrupt controller, data acquisition interfaces-Analog to Digital converter, Digital to Analog converter, integrated on to a single silicon chip.

Features:AT89S51

• Compatible with MCS-51® Products• 4K Bytes of In-System Programmable (ISP) Flash

Memory– Endurance: 1000 Write/Erase Cycles• 4.0V to 5.5V Operating Range• Fully Static Operation: 0 Hz to 33 MHz• Three-level Program Memory Lock• 128 x 8-bit Internal RAM• 32 Programmable I/O Lines• Two 16-bit Timer/Counters• Six Interrupt Sources• Full Duplex UART Serial Channel• Low-power Idle and Power-down Modes

Block diagram:AT89C51

Pin diagram:AT89C51

SEVEN SEGMENT DISPLAYA seven-segment display less commonly

known as a seven-segment indicator is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters, and other electronic devices for displaying numerical information.

SEVEN SEGMENT DISPLAY

LIGHT EMITING DIODES

Circuit symbol:

ABOUT SOFTWARE

*Keil software for C programming*Express PCB for lay out design*Express SCH for schematic

design

CONCLUSION

The project “Token Number Display & Management system for Banks” has been successfully designed and tested. Integrating features of all the hardware components used have developed it. Presence of every module has been reasoned out and placed carefully thus contributing to the best working of the unit.

 Secondly, using highly advanced IC’s and with

the help of growing technology the project has been successfully implemented.

 

BIBLIOGRAPHY

NAME OF THE SITES WWW.MITEL.DATABOOK.COMWWW.ATMEL.DATABOOK.COMWWW.FRANKLIN.COMWWW.KEIL.COM

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