wireless control of powered wheelchair using tongue presentation,tongue drive system ppt,tds...
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Wireless control of powered wheelchairs with tongue motion using tongue drive
assistive technology(TDS)
PROJECT ASSOCIATES
•Shijo John (1MV10EC099)•Santhoop K S (1MV10EC090)•Sudharshan R (1MV10EC108)•Vijay Narayan Reddy P S(1MV10EC117)
Bhuvaneswari N (Assistant Professor, Dept. of Electronics and Communication)
Under the guidance of
What is TDS?
TONGUE–OPERATED assistive technology for people with severe disability to control their environment
PURPOSE OF THE PROJECT
Traumatic spinal cord injury
Paralysis
EXISTING ASSISTIVE TECHNOLOGIES…
Sip-and-Puff wheel chairJoystick Controlled
Voice activated powered wheelchair Head control
Why Tongue?...
• MUSCLE fibers in tongue is similar to heart muscle fibers
• LOW rate of Perceived Exertion
• DIRECTLY connected to the brain
• HIDDEN inside mouth will give a certain degree of privacy
FRONT BACK
LEFT RIGHT
MAGNET POSITION
BASIC PRINCIPLE
TRANSMITTER BLOCK DIAGRAM
HALL SENSOR
HALL SENSOR
HALL SENSOR
HALL SENSOR
MICROCONTROLLER
(AT89S52)
RF Transmitter
Front
Back
Left
Right
TRANSMITTER CIRCUIT
RECEIVER BLOCK DIAGRAM
MICROCONTROLLER
(P89V51RD2)
RF Receiver
Motor2
Motor1
Motor Driver
PROXIMITY
SENSOR
RECEIVER CIRCUIT
INDUSTRIAL MODEL
HARDWARE
SENSOR- Hall effect sensor
• TRANSDUCER which varies its output voltage in response to changes in magnetic field
• Input Voltage: 4.5V - 24V• Output is a digital voltage 0 and 0.3 V
• 8K Bytes of In-System Reprogrammable Flash Memory.• 256 x 8-bit Internal RAM• 32 Programmable I/O Lines• Three 16-bit Timer/Counters• Eight Interrupt Sources
Microcontroller(AT89S52)
RF Transceiver
• Its frequency is 433MHZ
• It can transmit upto 100 meters distance
• HT12E is the Encoder
• HT12D is the Decoder
H-BRIDGE DRIVER
• L293
• Bidirectional-H Bridge driver
• 5V power supply is given
DC MOTORS
• 12V DC motors
• USED 2 motors: Left and right
• LEFT motor at rest and right in motion turn vehicle left and vice versa
• FOR forward and backward motion both the motors are driven in same direction with same speed
SOFTWARES
• Keil µVision 3• Language : Embedded C• Flash Magic
APPLICATION AND FUTURE SCOPE•It empowers people with disability to achieve maximum independence at home and in the community by enabling them to drive a power wheelchair and control their environment in a smoother and more intuitive way.
•Future scope of the project includes the ability to control various household devices like TV, air-condition etc. Also the user can control computers and mobile phones.
DISADVANTAGES
• USERS should avoid inserting ferromagnetic objects in their mouth.
• MAGNETIC tracer should be removed if the user is undergoing MRI.
CHALLENGES
We have faces a number of challenges in this project and also learned a number of new terms and microcontroller terminology.
• Hall sensor output voltage was not enough to activate a microcontroller pin.
• Back E.M.F produced by motors.• Exact Positioning of sensors.• Turning the vehicle Left or Right.
DEVELOPMENTS
QU
ES
TIO
N T
IME
REFERENCES•Yousefi, Xueliang Huo, Ghovanloo M "Preliminary assessment of Tongue Drive System in medium term usage for computer access and wheelchair control", Engineering in Medicine and Biology Society, EMBC, 2011 Annual International Conference of the IEEE, Pages 5766 - 5769, Aug.30 2011 - Sept.3 2011
•http://www.news.gatech.edu/features/tongue-drive-wheelchair
•Assistive technology devices, Available: http://www.wheelchairnet.org/WCNProdServ/Products/OtherATprod.htmI