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Presented by:
B. vedavathi(10091A1093)
K. rahimunnisa(10091A1064)
S.praveen(10091A1059)
B.sindhura(10091A1081)
S.Vijay kum...
INTRODUCTION:
 This project is to develop a wheel chair control which is

useful to the physically disabled person with h...
BLOCK DIAGRAM:
BATTERY:
 For power supply a lead acid battery is used.

Lead acid
battery

Bridge
rectifier

Filter
circuit

regulator

...
3-AXIS ACCELERATION SENSOR:
 Mems -small and highly sensitive accelerometer can

detect acceleration, inclination and vib...
 The MEMS 3-axis accelerometer consists of a mass at

the center of the sensors chip, which is suspended by 4
beams doped...
DC GEARED MOTORS:
 The wheelchair can be moved forward and reverse

direction using geared motors of 60RPM.
 This dc gea...
H-bridge:
 An H bridge is an electronic circuit that enables a

voltage to be applied across a load in either direction.
...
 When the switches S1 and S4 (according to the first

figure) are closed (and S2 and S3 are open) a positive
voltage will...
S1
1

S2

S3

S4

RESULT

0

0

1

MOTOR MOVES RIGHT

0

1

1

0

MOTOR MOVES LEFT

0

0

0

0

MOTOR FREE RUNS

0

1

0

...
Thank you……
AITS

11
Any

queries….
RGM

12
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Hand gesture based wheel chair for disable

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Hand gesture based wheel chair for disable

  1. 1. Presented by: B. vedavathi(10091A1093) K. rahimunnisa(10091A1064) S.praveen(10091A1059) B.sindhura(10091A1081) S.Vijay kumar(10091A1097)
  2. 2. INTRODUCTION:  This project is to develop a wheel chair control which is useful to the physically disabled person with his hand movement or his hand gesture recognition using MEMS technology.  In MEMS we have Tilt register. When we change the direction, the tilt registers values are changed and that values are given to microcontroller.  Depending on the direction of the MEMS, microcontroller controls the wheel chair directions like LEFT, RIGHT, FRONT, and BACK.
  3. 3. BLOCK DIAGRAM:
  4. 4. BATTERY:  For power supply a lead acid battery is used. Lead acid battery Bridge rectifier Filter circuit regulator Power supply to all sections
  5. 5. 3-AXIS ACCELERATION SENSOR:  Mems -small and highly sensitive accelerometer can detect acceleration, inclination and vibration by measuring the motion in the x-,y- and z-axis simultaneously.  Principle of detection: Magnitude of stress along x and y direction along z-direction
  6. 6.  The MEMS 3-axis accelerometer consists of a mass at the center of the sensors chip, which is suspended by 4 beams doped with piezo resistive material.  When the sensor is subjected to acceleration in any direction, the movement of the mass causes the 4 beams to deform and so changes the resistance of in the piezo material . This enables the sensor to detect the acceleration motion.
  7. 7. DC GEARED MOTORS:  The wheelchair can be moved forward and reverse direction using geared motors of 60RPM.  This dc geared motor is driven by h-bridge .
  8. 8. H-bridge:  An H bridge is an electronic circuit that enables a voltage to be applied across a load in either direction. These circuits are often used in robotics and other applications to allow DC motors to run forwards and backwards.  An H bridge is built with four switches (solid-state or mechanical).
  9. 9.  When the switches S1 and S4 (according to the first figure) are closed (and S2 and S3 are open) a positive voltage will be applied across the motor. By opening S1 and S4 switches and closing S2 and S3 switches, this voltage is reversed, allowing reverse operation of the motor.
  10. 10. S1 1 S2 S3 S4 RESULT 0 0 1 MOTOR MOVES RIGHT 0 1 1 0 MOTOR MOVES LEFT 0 0 0 0 MOTOR FREE RUNS 0 1 0 1 MOTOR IN BRAKE CONDITION 1 0 1 0 MOTOR IN BRAKE CONDITION 1 1 0 0 SHOOT-THROUGH
  11. 11. Thank you…… AITS 11
  12. 12. Any queries…. RGM 12

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