AIM:
 To control the movement of a manual wheelchair by
means of human voice for paralyzed patients.
BLOCK DIAGRAM
MIC
VOICE
RECOGNITION
IC
RESET
MICROCONTR
OLLER
DRIVER
CIRCUIT
RIGHT
MOTOR
BATTERY
SPEED &DIRECTION
CONTROl
DRIVER
CIRCUIT
LEFT
MOTOR
BATTERY
CHARGER
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.