WHEEL CHAIR

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ABSTRACT:

The robotic wheelchair learns the layout of its environment (hospital, rehabilitation center, home, etc.) through a narrated, guided tour given by the user or the user’s caregivers. Subsequently, the wheelchair can move to any previously-named location under voice command (e.g., “Take me to the cafeteria”). This technology is appropriate for people who have lost mobility due to brain injury or the loss of limbs, but who retain speech. The technology can also enhance safety for users who use ordinary joystick-controlled powered wheelchairs, by preventing collisions with walls, fixed objects, furniture and other people.

WORKING:

In this project we are using a simple wheel chair and with the help of some mechanical work we are placing motor with the wheels this could make possible to wheel chair to drive with the help of these motor. To drive the motor or to give power to the motor we are also placing a small battery with it which will give power to the motors when someone wants to drive it. To drive the wheel chair we are placing two types of driving method in it. Firstly, if the person who is sitting on the wheel chair wants to drive its wheel chair then with the help of manual remote which is placed on the handle of the wheel chair can easily drive its wheel chair to any direction. To make the wheel chair more controllable we have to fix the driving speed of the wheel chair so that it could be safe for the person who is sitting on it. The remote which we are placing on the handle of the wheel chair will give four options to the person to drive its wheel chair in four different directions. If he wants to drive his wheel chair in the forward direction then he has to press the button of the forward direction and vice versa. Second method that we are adding in this project is that we are controlling the wheel chair with the help of a circuit which make possible to the person to control the wheel chair with the help of a mobile. We are connecting a mobile with the wheel chair. This mobile is connected with a micro controller circuit. The purpose of connecting micro controller with the mobile make possible to control the driving of the wheel chair with the help of this mobile. The working is very simple; a mobile is connected with the circuit. So whenever someone calls on this mobile and press pre defined buttons on his mobile then this mobile produces some DTMF tones in it. This mobile is connected with the DTMF decoder IC which is 8870 which decode this DTMF tone and send different bits to the connected micro controller. The micro controller is a programmable chip in which we program it to send four different bits to the connected relay driver IC ULN 2003. The working of relay driver IC is to drive relay as per the input received from the micro controller. These relays play the role of automatic switches which will on and off according to the command given by the micro controller and drive the motor as per the button pressed on the mobile.

We are using dc motors with gear to drive our wheel chair. To provide power to our circuit and wheel chair we are placing battery with it. This battery is a rechargeable battery so when the power of the battery is low we can easily charge it to drive our wheel chair smoothly.

COMPONENT LIST:

  1. Micro controller
  2. DTMF Decoder IC’
  3. Cell Phone
  4. Resistance
  5. Crystal oscillator
  6. Capacitor
  7. Transistor
  8. Relay Driver IC
  9. Relay
  10. Switches
  11. Motor
  12. Gears
  13. Iron rod
  14. Iron sheet
  15. Motor
  16. Battery
  17. Voltage regulator IC

ADVANTAGES:

Robotic wheelchairs extend the capabilities of traditional powered devices by
introducing control and navigational intelligence. These devices can ease the lives of
many disabled people, particularly those with severe impairments, by increasing their
range of mobility.

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