UNDER THE GUIDANCE OF MR.SANTOSH RAO Asst. Professor ,I&CT Dept. MIT ,ManipalAnubhuti Sharma 090911596

Introduction Problem definition Block diagram Literature survey Scope of the project Risks Modules implemented Modules left References

The Project aims at controlling a wheelchair for handicaps by means of human voice.

The user can train the words he needs the circuit to recognize.This board has 8-bit data out, which can be interfaced with any microcontroller for further development.

The wheelchair is controlled by voice commands. This can be moved in forward and reverse direction using geared motors of 60RPM.Also this wheelchair is a type of robot which can take sharp turnings towards left and right directions. This project uses 8051 as its controller. This project uses 6V battery.

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

The

current voice controlled wheel chairs are expensive due to the sensors that identify obstructions. This is a more affordable wheel chair for the disabled giving them the basic feature of voice recognition.

HM2007LHM6264 74LS373

LATCH 8051 MICROCONTROLLER MOTOR DRIVER CIRCUIT MOTORS

MIC

RESET

RIGHT MOTOR

VOICE RECOGNITION IC

MICROCONTR OLLER

DRIVER CIRCUIT

BATTERY

BATTERY CHARGER

LEFT MOTOR

52

pin (plcc package) IC. Can be trained to recognise up to 40 words Accepts the voice signal . Matches it with words in the memory . If match found returns the memory address. Else returns the number 77.

Connected

to an external RAM to store the trained words. be speaker independent /dependent.

Can

Each

word can be maximum 1.92sec long.

Microphone

can be connected directly to the analog input. is a BCD coded decimal number (memory location).

Output

The Hitachi HM6264B is 64k-bit static RAM organized 8-kword 8-bit. It realizes higher performance Low power consumption by 1.5 mm CMOS process technology.

High speedFast access time: 85/100 ns (max) Single 5 V supply

Common data input and outputBattery backup operation capability

Complete, highly-integrated microcomputer CPU, RAM, ROM, IO Port 0 8-bit bidirectional I/O port OR multiplexed low-order address and data bus bytes Port 1 8-bit bidirectional I/O port Port 2 8-bit bidirectional I/O port OR high-order address byte Port 3 8-bit bidirectional I/O port OR various special-function signals

Make WAIT pin HIGH for training mode. Clear the memory by pressing 99 *. Enter the location number to be trained. After entering the number the LED will turn off. Number will be displayed on the display.

Next press # to train.

The chip will now listen to the voice input and LED will turn ON. Now, speak the word you want to train into the microphone. The LED should blink momentarily. This is the sign that the voice has been accepted. Continue doing this for different words.

Repeat

the trained word into the microphone. word is rightly recognized, the correct location is displayed. error codes are: 55- word too long. 66-word too short. 77-word no match.

If

The

H

bridge circuit used for controlling the DC motors. can be designed using Express PCB.

PCB

Converts

the 5 v power used for all the ICs to 12v power to drive the motor.inputs from the microcontroller. to the motor.

4

4outputs

PCB is used to avoid most of all the disadvantages of conventional breadboard. These also avoid the use of thin wires for connecting the components; they are small in size & efficient in performance. The following points are to be observed while forming the layout of PCBBetween two components, sufficient space should be maintained. High voltage/max dissipated components should be mounted at sufficient distance from semiconductor and electrolytic capacitors. The most important points are that the components layout is making proper compromise with the copper side circuit layout.

An

electric motor converts electrical energy into mechanical motion. DC motors drives the wheels of wheel chair.

The different direction of motions possible is:

Forward: Both the motors in forward direction Reverse: Both the motors in the reverse direction Left: Left motor stopped/Right motor in the forward direction Right: Right motor stopped/Left motor in the forward direction In turn: The motors are in the opposite direction

Failure

of any of the components would result in the failure of the entire chair. the circuit has mistakes its difficult to detect them. awareness of the target customers is important for the project to be a success.

If

The

Understanding

the working of the project Understanding the individual components. Designing the circuit. Designing the motor driver PCB.

Making

the recognition circuit. Interfacing of the recognition circuit with C and motor driver. Testing.

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