VOICE OPERATED WHEEL CHAIR - Techtop

spectacularscarecrowAI and Robotics

Nov 17, 2013 (4 years and 1 month ago)

82 views


To

control

the

movement

of

a

manual

wheelchair

by

means

of

human

voice

for

paralyzed

patients
.




AIM:


BLOCK DIAGRAM

MIC


VOICE
RECOGNITION
IC




MICROCONTR
OLLER


DRIVER


CIRCUIT

RIGHT

MOTOR

BATTERY

CHARGER

BATTERY

LEFT
MOTOR


DRIVER


CIRCUIT

SPEED &DIRECTION


CONTROl

RESET


SPECIFICATIONS

1.MICROCONTROLLER:
ATMEL 89C51


2.VOICE RECOGNITION IC :
ISD 2500



3. MOTOR DRIVER CIRCUIT



4.MOTORS(DC):
HUB MOTOR


5.BATTERY



VOICE RECOGNITION IC



ACCEPTS THE VOICE INPUT SIGNAL


SPEED AND DIRECTION RECORDED


MICRO CONTROLLER




PROCESSES DATA



PROVIDES CONTROL VOLTAGE TO MOTORS


DC MOTORS



DRIVES THE WHEELS OF THE CHAIR IN


NECESSARY MODES




VOICE RECOGNITION IC


It’s

a

single

chip

CMOS

voice

recognition

module




5

-
10

isolated

word

voice

can

be

recognized




It

compares

the

input

voice

signal

with

the

previously

recorded

signal



Insensitive

to

environmental

sounds
.




Its

output

serves

as

a

input

to

microcontroller
.



MICRO CONTROLLER:
ATMEL 89C51



8 Bit CPU optimized for control applications



On
-

Chip Flash Program Memory



On
-

Chip Data RAM



Bi
-
directional and Individually Addressable I/O Lines



Multiple 16
-
Bit Timer/Counters



Full Duplex UART



On
-

Chip EEPROM


MOTOR DRIVER



Control

the

motor

in

the

forward

,reverse,


left

&

right

direction
.





It

consists

of

four

relays
.





The

relay

ON

and

OFF

is

controlled

by

the

two

pairs

of

switching

transistors
.



MOTOR


Electric

dc motor is used .




It works on the principle of electromagnetism.


BATTERY



12volt battery



Long life and chargeable

ADVANTAGES


Compact



user friendly


less complex.


Low cost


Easy to implement


Accuracy


Economical


Reduce manpower




CONCLUSION



Due to the probability of high technology (Atmel
microcontroller) used this “Voice operated vehicle”
system is fully software controlled with less hardware
circuit. The feature makes this system is the base for
future systems.


FUTURE IDEAS:


Powered wheelchair with a speech based interface and
biosignal monitoring instrumentation.




The user can use the voice, a natural communication
method, for controlling the chair movement and obtain
information about his health.