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RFID stands for Radio Frequency Identification The main functionality of this project is to verify the

attendance of the user who needs to access it through

RFID tag.

The authorized person is given an RFID tag.

RFID provides Level 2 security.

Level 1 security includes Eye Retina Scan, Biometrics

System. Since we have used GSM modem, higher authority of

the organization can track the entry of persons from

any place or location.

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Microcontroller (P89C51) Heart of the System

8051 CPU Core 5V Operating voltage

64kB program

memory

11.0592MHz

Operating frequency

4 no. 8 bit I/O ports

3 no.16bits T/C Programmable

watchdog timer

1kB Data RAM

Enhanced UART

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LCD (Liquid Crystal Display)

16x2 lines

LCD

To send data to LCD

* R/W=0* RS=1

* Pulse E (High to Low)

Pin No. Name Description

Pin no. 1 VSS Power supply (GND)

Pin no. 2 VCC Power supply (+5V)

Pin no. 3 VEE Contrast adjust

Pin no. 4 RS0 = Instruction input

1 = Data input

Pin no. 5 R/W0 = Write to LCD module

1 = Read from LCD module

Pin no. 6 E Enable signal

Pin no. 7 D0 Data bus line 0 (LSB)

Pin no. 8 D1 Data bus line 1

Pin no. 9 D2 Data bus line 2

Pin no. 10 D3 Data bus line 3

Pin no. 11 D4 Data bus line 4

Pin no. 12 D5 Data bus line 5

Pin no. 13 D6 Data bus line 6

Pin no. 14 D7 Data bus line 7 (MSB)

Pin no. 15 LED+ Anode of LED for Backlit

Pin no. 16 LED- Cathode of LED for Backlit

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RS-232 (Serial Cable)

Microcontroller gives

TTL output & in order to

connect it to any device

which is RS-232 compati-ble, we need to convert to

RS-232 voltage levels.

To achieve these voltage levels we make use of

MAX232 IC (Single Chip). 5V Operating voltage.

Multiple driver & receiver outputs.

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RFID Reader

RFID system contains1. Reader2. Transceivers with

decoders3. Transponder (Tag)

Also called as Interrogators, as it recognizes nearbytags.

RFID Reader RF Energy RFID Tag(Tag antenna picks RF energy & converts to Electrical energy via Induction.This energy powers semiconductor chip attached to Tag Antenna which hasTag Identity)

RFID Tag Identity RFID Reader(RFID Reader receives Identity in terms of Morse Code by varying

resistance of Tag Antenna)

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RFID Tags

Passive Tags: Active Tags: No battery within

Reflect back the signal

generated by Reader

Short Read Range Less expensive

Battery present

Transmit their own

signals

Large Read Range Expensive

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Keypad

They are part of HMI

Fig shows 4x4 matrix

keypad

To interface keypad toMuC 8 pins are required.

4- Columns, 4- Rows

Port 1.4 Port 1.5 Port 1.6 Port 1.7

Port 1.0 Key 1 Key 2 Key 3 Key A

Port 1.1 Key 4 Key 6 Key 6 Key B

Port 1.2 Key 7 Key 8 Key 9 Key C

Port 1.3 Key * Key 0 Key # Key D

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EEPROM (Electrically Erasable Programmable ROM)

Nonvolatile memory.

Widely used to store data like Username, Passwords,

System Settings permanently.

They retain data even after power is removed. EEPROM with serial communication is used using IC

interface which requires only 2 lines.

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GSM Modem

Works with GSM wireless network (using radio

waves)

PC uses AT (Attention) Commands to control

modems.Ex: AT+CMGS= Send Msg

AT+CMGR= Read Msg

AT+CMGD= Delete Msg P89V51RD2MCU

RS232 TTL

Convertor

(Optional)

GSM MODEM

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RFID Tag swiping

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Add Employee

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Enable Alerts

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Update Mobile Number

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Contactless Writable Data

Absence of Line of Sight

Variety of read ranges

Wide data capacity range

Support multiple tags read

Rugged

Smart tasks (like measuring surrounding conditionslike temperature and pressure)

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Poor performance with RF-Opaque & RF-Absorbentobject

Impacted by environmental factors

Limitation of actual tag reads

Impacted by hardware interference

Limited penetrating power of RF energy

Immature technology

No strong biological authentication

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Item tracking and tracing Inventory monitoring and control

Asset monitoring an management

Anti theft

Electronic payment

Access control

Anti tampering

Automatic Vehicle identification Patient Monitoring

Document / Jewellery tracking

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We have made an electronic attendance systembased on RFID with a GSM alerts, we have

demonstrated Adding/Deleting employee from

database, storing of their attendance records,

checking their status later records can be downloaded

to any PC.

This model can be enhanced by providing touch

screen keypad, wireless PC interface to download,memory expansion

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