Design, fabrication and control of multi-posture smart wheelchair phase (III)

Project Title

Design, fabrication and control of multi-posture smart wheelchair phase (III)

Project Area of Specialization Mechanical EngineeringProject Summary

In this paper work a convertible wheelchair is designed and manufactured for the spinal cord injured people. The main concern of patients with severe medical injuries is comfort while sitting on the chair but continuous sitting creates more problem like heart rate, respiration problems bladder issues that’s why they need another person to keep them transferring to bed and wheelchair for different events. Our proposed design of wheelchair chair comprise a bed position and standing position on same structure so that they can relax changing their postures. The attached seat is comfortable to sit on and back seat is stretched up to head to provide holding structure for head as well when bed position is attained. For mobility of wheelchair two DC motor attached one on each side wheel is powered through rechargeable DC battery. Making things easily controllable and understandable for old aged patients, push button controls for convertibility of postures and maneuverability of wheelchair is attained through Arduino UNO microprocessor controller and BTS 7960 Motor driver modules.

Project Objectives

Be simple and user friendly to control. 
Making convertibility safer possible.
Reducing discomfort to the body parts in contact with wheelchair specially Knees.
To have components with light in weight possible. 
To reduce the expenses by choosing the sort of component.

Project Implementation Method

Initially the calculations were taken regarding the forces that will be acting

Then the frame was designed on 3d software

Then the frame was fabricated

During fabrication the linear actuators were installed for posture changing and motors were installed for movemen

Posture changing was achieved through control system

Then damper was implemented into rear wheels for reducing jerks

Motors were re aligned

Control system for posture changing was also enhances to reduce time for posture changing

Benefits of the Project

The chair will be very useful for physically handicapped individuals who require mobility in their everyday lives

Lives of physically disabled people will be improved

Users of this chair will not only just stay in one position but will also be able to stand or change to the bed position

Mobility will be enhanced according to the user's choice

Technical Details of Final Deliverable

For mobility of wheelchair two DC motor attached one on each side wheel is powered through rechargeable DC battery. Making things easily controllable and understandable for old aged patients, push button controls for convertibility of postures and maneuverability of wheelchair is attained through Arduino UNO microprocessor controller and BTS 7960 Motor driver modules.

Final Deliverable of the Project Hardware SystemCore Industry MedicalOther Industries Transportation Core Technology OthersOther TechnologiesSustainable Development Goals Good Health and Well-Being for PeopleRequired Resources

Item Name	Type	No. of Units	Per Unit Cost (in Rs)	Total (in Rs)
			Total in (Rs)	74850
battery	Miscellaneous	1	3500	3500
power steering motor	Equipment	2	4000	8000
back and front wheel	Equipment	1	1500	1500
sprocket	Equipment	2	300	600
chain	Equipment	2	250	500
linear actuators	Equipment	4	8000	32000
frame and base structure	Equipment	1	8000	8000
seat and footrest	Equipment	1	3000	3000
H-bridges	Equipment	5	550	2750
joystick	Miscellaneous	1	2500	2500
beating	Equipment	4	2000	8000
control box and wiring	Equipment	1	2000	2000
power bank	Miscellaneous	1	2500	2500