2. AIM:
To control the movement of a manual wheelchair by means of human voice for paralyzed patients.

3. BLOCK DIAGRAM MIC VOICE RECOGNITION IC MICROCONTROLLER DRIVER CIRCUIT
RIGHT
MOTOR
BATTERY
CHARGER
LEFT MOTOR
SPEED &DIRECTION
CONTROl
RESET

4. SPECIFICATIONS
1.MICROCONTROLLER: ATMEL 89C51 2.VOICE RECOGNITION IC : ISD MOTOR DRIVER CIRCUIT 4.MOTORS(DC):HUB MOTOR 5.BATTERY

5. 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

6. 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.

7. 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

8. 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.

9. MOTOR BATTERY 12volt battery Long life and chargeable
Electric dc motor is used .
It works on the principle of electromagnetism.
BATTERY
12volt battery
Long life and chargeable

10. ADVANTAGES Compact user friendly less complex. Low cost
Easy to implement
Accuracy
Economical
Reduce manpower

11. 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.

12. 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.

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