DESIGN AND DEVELOPMENT OF WHEELCHAIR FOR PHYSICALLY DISABLED PERSON BASE ON ACCELEROMETER

TEAM MEMBERS

AMAR SHIRODKAR TANAYA PANDIT

SAILI KAMAT

JEEVITHA KANNAN

PROJECT GUIDE - Mr. Sangam Borkar

ABSTRACT

OBJECTIVE: To control movement of wheelchair using hand gestures.

Gesture recognition is done by ADXL335 accelerometer.

Microcontroller Atmega16 is the controlling unit used.

INTRODUCTION Objective: To control a wheelchair with the

help of the movement of the palm.

3 important components: 1. Microcontroller 2. Accelerometer 3. Motors and batteries

The movement represents different operations such

as forward, reverse, left, right.

Why we intend to design gesture controlled power wheelchair instead of manual wheelchair?

Because manual wheelchairs…

1.Require either upper body strength OR human power to move them. 2. Less stability

3. Less comfort

4. Require inflation of tires

5. Limits personal mobility.

SYSTEM OVERVIEW The project aims at controlling a wheelchair by means

of hand gestures.

Atmega16 is suitable microcontroller as per our requirement.

The hand gesture recognition is done by Accelerometer ADXL 330.

Cont…

SYSTEM OVERVIEW (CONT…)

• DC motors are used to drive the wheelchair.

• The chain drive is use as driving mechanism

• Two 12V,32Ah maintenance free, lead acid batteries are used.

BLOCK DIAGRAM

SPEED & DIRECTION CONTROL

Accelerometer

Right motor

Left motor

Batteries

Chain drive mechanism

Chain drive mechanism

LCD 16x2

Microcontroller

PIN DIAGRAM:ATMEGA16

1. VCC: Digital supply voltage

2. PORT A(PA7...PA0): Serves as analog input to A/D converter

3. PORT B(PB7…PB0):8 bit bidirectional I/O port with internal pull up resistors.

4. PORT C(PC7…PC0):8 bit bidirectional I/O port with internal pull up resistors.

5. PORT D(PD7…PD0):8 bit bidirectional I/O port with internal pull up resistors.

6. RESET: Reset input

7. GND: Digital supply 0v.

ACCELEROMETER

•Accelerometer is 6pin device.

• It is a use for measuring static and dynamic acceleration.

It is 3-axis accelerometer with full range of ±3g • Small dimensions, easy to integrate into prototype devices.

•Application are in mobile devices , gaming system , robotics etc.

ACCELEROMETER (CONTD..)

•Operating voltage range is +5V.•Every axis accelerometer gives An analog output . eg:-0º-1650mv. 90º-2450mv. X-axis

ACCELEROMETER OUTPUT OF X, Y, Z DIRECTION ON LCD .

MOTORS•THIS ARE 12V DC MOTOR WHICH ARE USE TO MOVE WHEELCHAIR .

•THIS ARE HEAVY DUTY MOTORS,WITH VOLTAGE RANGEOF 12V/ 24V WITH RATED SPEED OF 166 RPM AND TORQUE OF 16.5Nm .

•WE ARE USING WINDSHIELD WIPER MOTORS ,WHICH ARE MEDIUM DUTY MOTORS AND HAS 53 RPM.

• THIS MOTOR HAS LOW NOISE AND LONG LIFE SPAN AND CHEAP ALSO.

LCD 16X21. The display used here is 16x2 LCD

.This means 16 characters per line by 2 lines.

2. The three control lines are referred to as EN, RS, and RW and 8-bit data line.

3. The EN is called Enable. This control line is used to tell the LCD that we are sending it data

4 The RS line (Register Select)line. When RS is low (0) its means clear the screen.

5. The RW (Read/Write) control line. When RW is low (0), the data is written to the LCD. When RW is high (1), the data is reading.

MOTOR DRIVER TRANSISTOR CIRCUIT

CIRCUIT DIAGRAM

MECHANICAL UNIT:

1 2

3 4 5

MECHANICAL UNIT:

1. MEDIUM TORQUE 12V DC MOTOR

2. FREEWHEEL AXIAL HUB

3. CYCLE PEDAL UNIT

4. CYCLE FREE WHEEL

5. CHAIN DRIVE MECHANICAL UNIT

BATTERIES -

Two 12V,32Ah lead acid batteries

CHALLENGES TO BE FACED Coupling of motors to the wheelchair by

means of chain drive.

Design of the speed and direction control circuit.

Design of battery charger.

BENEFITS OF GESTURE CONTROLLED WHEELCHAIR

• Easy and convenient to control

• Control can be designed as per the disability

• Increased physical support

• More terrain options

• Increased mobility

FINAL PHASE OF PROJECT

CONTACT AS FOR ANY ENQUIRE :

Amarshirodkar23@Gmail.com

Pandittanaya@Gmail.com

Sailikamat15@Gmail.com

THANK YOU