Hand gesture based wheel chair for disable

Hand gesture based wheel chair for disable

• 1.
  Presented by: B. vedavathi(10091A1093) K.rahimunnisa(10091A1064) S.praveen(10091A1059) B.sindhura(10091A1081) S.Vijay kumar(10091A1097)
• 2.
  INTRODUCTION:  This projectis 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.
  BLOCK DIAGRAM:
• 4.
  BATTERY:  For powersupply a lead acid battery is used. Lead acid battery Bridge rectifier Filter circuit regulator Power supply to all sections
• 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.
   The MEMS3-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.
  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.
  H-bridge:  An Hbridge 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.
   When theswitches 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.
  S1 1 S2 S3 S4 RESULT 0 0 1 MOTOR MOVES RIGHT 0 1 1 0 MOTORMOVES 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.
  Thank you…… AITS 11
• 12.
  Any queries…. RGM 12