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1. ARM 7 PROCESSOR BASED - ASSISTING
BLIND PERSON USING RFID CARD AND
READERS
This Project comprises of a Hardware mechanical model which is
controlled by the electronic circuits to assist a blind person. I.e., This mechanical
model is attached with the walking stick of the blind person. The model will move
automatically. This model helps the blind person to reach the destination quickly.
The model has a Master Control unit through which it can identify the path. When
the source and destination is selected the unit will calculate the path using. The
unit will then tell the user to move in which direction. The movement of the user
in ensured using a RFID proximity cards and a reader. The reader will be placed
on the unit and on encountering of cards (Cards placed at each point) will tell the
user has to take right or left or straight through voice output. An APR 9600 voice
storage and retrival IC is used for this purpose.
The unit will give alarm signal when it finds a Obstacle. This project is
divided into modules for better understanding of the circuit.
The modules included in this project are
Pic Embedded Microcontroller PIC 16F877
Battery for Power Supply
RFID Card Reader with cards
APR 9600 Voice Recording and Playback IC
Software Driver in Hitech ‘C’ Language.
Pic Embedded Microcontroller (PIC 16F877):
This is the heart of the device which is responsible for sensing the obstacles
and producing voice Output.

2. RFID Card Reader with Cards
A RFID Card reader is fixed on the unit. Cards will be placed on the path
at regular intervals. When the unit encounters a card, it can sense the point at
which the unit is present through the unique code present in the card.
APR 9600 Voice Recording and Play Back IC
This IC is a Single Chip Voice Recording and Playback IC. A Prerecorded
Voice is Stored into the IC. It can be played again by the controller by sending a
control signal to the IC.
Block Diagram
Power ON
LED Switches for
Alarm Output selecting
Destination
ARM 7 PROCESSOR – LPC2148 APR 9600 Voice IC
On OFF Switch
Potential
divider
Speaker
RFID Card
Power supply Reader Cards
unit Ultrasonic
sensor

3. RFID Card Reader with Cards
A RFID Card reader is fixed on the unit. Cards will be placed on the path
at regular intervals. When the unit encounters a card, it can sense the point at
which the unit is present through the unique code present in the card.
APR 9600 Voice Recording and Play Back IC
This IC is a Single Chip Voice Recording and Playback IC. A Prerecorded
Voice is Stored into the IC. It can be played again by the controller by sending a
control signal to the IC.
Block Diagram
Power ON
LED Switches for
Alarm Output selecting
Destination
ARM 7 PROCESSOR – LPC2148 APR 9600 Voice IC
On OFF Switch
Potential
divider
Speaker
RFID Card
Power supply Reader Cards
unit Ultrasonic
sensor

4. RFID Card Reader with Cards
A RFID Card reader is fixed on the unit. Cards will be placed on the path
at regular intervals. When the unit encounters a card, it can sense the point at
which the unit is present through the unique code present in the card.
APR 9600 Voice Recording and Play Back IC
This IC is a Single Chip Voice Recording and Playback IC. A Prerecorded
Voice is Stored into the IC. It can be played again by the controller by sending a
control signal to the IC.
Block Diagram
Power ON
LED Switches for
Alarm Output selecting
Destination
ARM 7 PROCESSOR – LPC2148 APR 9600 Voice IC
On OFF Switch
Potential
divider
Speaker
RFID Card
Power supply Reader Cards
unit Ultrasonic
sensor

5. RFID Card Reader with Cards
A RFID Card reader is fixed on the unit. Cards will be placed on the path
at regular intervals. When the unit encounters a card, it can sense the point at
which the unit is present through the unique code present in the card.
APR 9600 Voice Recording and Play Back IC
This IC is a Single Chip Voice Recording and Playback IC. A Prerecorded
Voice is Stored into the IC. It can be played again by the controller by sending a
control signal to the IC.
Block Diagram
Power ON
LED Switches for
Alarm Output selecting
Destination
ARM 7 PROCESSOR – LPC2148 APR 9600 Voice IC
On OFF Switch
Potential
divider
Speaker
RFID Card
Power supply Reader Cards
unit Ultrasonic
sensor