1. RFID Based Access Control And Students
Attendance Management System
For companies where security is vital and access to certain
areas must be controlled and monitored, there should be an
access control system that allow companies to manage and
monitor all access points and locks, allowing for auditable
security and quick responses to any security breaches.
When we consider about Security the distinct ways are
Authentication, Authorization and Access Control.
Authentication is any process by which you verify that someone
is who they claim they are. This can be of any method of
demonstrating identity, such as a smart card, retina scan etc.
Authentication is equivalent to showing your drivers license at
the ticket counter at the airport.
Authorization is finding out if the person, once identified, is
permitted to have the resource. This is usually determined by
finding out if that person is a part of a particular group, if that
person has paid admission, or has a particular level of security
clearance. Authorization is equivalent to checking the guest list at
an exclusive party, or checking for your ticket when you go to
the opera.
89 RANGARAJAPURAM MAIN ROAD,KODAMBAKKAM,CHENNAI-24
PL VISIT www.maastechindia.com,mobile:098402 34766

2. Finally, access control is a much more general way of talking
about controlling access to a resource. Access can be granted or
denied based on the privillages granted to him. Access control is
analogous to locking the gate at closing time, or only letting
people onto the ride who are more than 48 inches tall - it's
controlling entrance by some arbitrary condition which may or
may not have anything to do with the attributes of the particular
visitor.
Attendance management:
Here, in our project we have used an RFID Card Reader,
Keypad and a PIC Micro controller (PIC16F877) for authentication
of a person. The data from the RFID Reader is transmitted to a
remote computer through a Wireless RF Transmitter.
An RF Receiver Which is connected to a computer determines the
authorization and Access control rights.
After The validation process is over, The user will be
allowed to enter the premises and his entry date and time is
marked into the database. Using Vb software we can generate
reports like how many days the students are present and much
more.
All user access information is gathered by a central PC-
based workstation where the administrators can retrieve and
analyze the information.
89 RANGARAJAPURAM MAIN ROAD,KODAMBAKKAM,CHENNAI-24
PL VISIT www.maastechindia.com,mobile:098402 34766

3. THE 125 KHZ RFID CARD
The card used in our project is a passive Radio Frequency
Identification (RFID) device for low-frequency applications (100 kHz-400
kHz). The device is powered by rectifying an incoming RF signal from the
reader. The device requires an external LC resonant circuit to receive the
incoming RF signal and to send data. The device develops a sufficient DC
voltage for operation when its external coil voltage reaches approximately
10 Vpp.
This device has a total of 128 bits of user programmable memory and
an additional 12 bits in its configuration register. The user can manually
program the 128 bits of user memory by using a contact less programmer.
The device is a One-Time Programmable (OTP) integrated circuit and
operates as a read-only device after programming.
TYPICAL PIN DETAILS OF THE CHIP INSIDE THE RFID CARD
FEATURES
• Factory programming and memory serialization.
• One-time contactless programmable (developer kit only)
• Read-only data transmission after programming
• 96 or 128 bits of One-Time Programmable (OTP) user memory (also
supports 48 and 64-bit protocols)
• Typical operation frequency: 100 kHz-400 kHz
• Ultra low-power operation (5 µA @ VCC = 2V)
• Modulation options:
89 RANGARAJAPURAM MAIN ROAD,KODAMBAKKAM,CHENNAI-24
PL VISIT www.maastechindia.com,mobile:098402 34766

4. - ASK, FSK, PSK
RX-3304 Manual
1. Introduction:
This is the radio frequency receiver module, which can facilitate the OEM designers to design their
remote control applications in remote control in the quickest way. The circuit is designed with SMD
components and the module size is small enough to be able to be fitted in almost any application.
 Super-regenerative Version W/O Decoder (AM): RX-3304
AM: Amplitude Modulation
Pin Definition:
PIN 1: GND
PIN 2: Digital Output
PIN 3: Linear Output (For Testing)
PIN 4: VCC (5V DC)
PIN 5: VCC (5V DC)
PIN 6: GND
PIN 7: GND
PIN 8: ANT
Dimension of RX-3304: 44 mm X 11 mm
 Specification Table:
Model SR POWER Data SENSITIVITY POWER Modulation Band Width
mode CONSUMPTION
Rate (bps) DBm
(mA)
RX-3304 SR +5V DC 300~5K - 100 2.70 AM 12MHZ
Notes:
SR: Super-Regenerative; AM: Amplitude Modulation
89 RANGARAJAPURAM MAIN ROAD,KODAMBAKKAM,CHENNAI-24
PL VISIT www.maastechindia.com,mobile:098402 34766

5. WIRELESS TRANSMITTER MODULE TX1-433.92MHZ-S
FEATURES:
• Complete RF Transmitter Module no
external components and no tuning
required.
• High Performance SAW Based
Architecture with a Maximum Range of
100 feet at 4800 bps data rate.
• Interface directly to Encoders and
Microcontrollers with ease.
• Low Power Consumption suitable
for battery operated devices.
• 4 Pin Compact size module
PIN DETAILS • Can be directly used in your PCB
• Right angle Pin (Flat out) is the
PIN 1 RF OUT standard in these modules.
PIN 2 DATA IN • Optional Vertical pin out available
• Can be used with Fixed Code and
PIN 3 GROUND
Rolling Code Encoders or direct with
PIN 4 VCC microcontrollers
SPECIFICATIONS
PARAMETER MINIMUM TYPICAL RANGE UNITS
Modulation method ON-OFF KEYED (OOK) Modulation (AM)
Voltage 2.7 3 5.2V DC
Supply Current 5 5.5 mA
Stand by Current 3 micro A
Output power into
-2 0 0 dBm
50ohms
Overall frequency
-250 250 KHz
accuracy
Data input low 0 0.8 Volts
89 RANGARAJAPURAM MAIN ROAD,KODAMBAKKAM,CHENNAI-24
PL VISIT www.maastechindia.com,mobile:098402 34766

6. Data input High >0.8 Vcc Volts
Operating temp. range 0 70 Deg. Cel
Operating frequencies 433.67 433.92 434.17 MHZ
Max. Data rate 2400 bps
Antenna External1/4 Wave Whip, Helical or PCB Trace
Package SMD
Block Diagram
Reports
CPU
RF
Receiver
RF
Transmitter
RFID Reader CARD
PIC 16F877
Power PIC Microcontroller
Supply
Keypad
1 2 3
4 5 6
Relay Driver
7 8 9
0 E
LCD Display *
Relay out put
89 RANGARAJAPURAM MAIN ROAD,KODAMBAKKAM,CHENNAI-24
for Door
PL VISIT www.maastechindia.com,mobile:098402 34766
Control