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To control the movement of a manual wheelchair by means of human voice for paralyzed patients.
AIM:
BLOCK DIAGRAM
MIC
VOICE RECOGNITION
ICMICROCONTROLLER
DRIVER CIRCUIT
RIGHTMOTOR
BATTERYCHARGERBATTERY
LEFT MOTOR
DRIVER CIRCUIT
SPEED &DIRECTION CONTROl
RESET
SPECIFICATIONS1.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 ICIt’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 89C518 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.
MOTORElectric dc motor is used .
It works on the principle of electromagnetism.
BATTERY
12volt battery
Long life and chargeable
ADVANTAGESCompact user friendly less complex.Low cost Easy to implementAccuracyEconomicalReduce manpower
CONCLUSIONDue 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.
