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John Rodrigues
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Product Designer|Entrepreneur |Founder of designwithjohn.com
 · HonnavarIndia
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TRUST HACK

Roadmap for design and fabrication of smart wheelchair

The basic things we are now looking are
1.Motor
2.wheels
3.motor driver
4.Battery

let me start with the battery
we need a battery of 12v and current in the range of 35-55ah
you can go with this http://www.monsterscooterparts.com/u1battery.html
However, if you are buying from India then I will recommend http://www.amazon.in/Exide-Mileage-Car-Battery-35ah/dp/B010X9ADEK?tag=googinhydr18418-21&tag=googinkenshoo-21&ascsubtag=a376384b-3523-4835-9eb1-44b8ceb23ad8

For Motor

You can go with this one
http://www.ebay.com/itm/LEFT-DRIVE-MOTOR-Jazzy-1113-ATS-Electric-Wheelchair-Part-LH-Rear-Wheel-Hub-OEM-/122528370419?hash=item1c87428ef3
(I am trying to find the data sheet for it )
However motor should have torque above 100 kg-cm

And I would not recommend to go with this one https://www.amazon.com/Makermotor-Reversible-Electric-Gear-Motor/dp/B00LTM3AT6/ref=pd_lpo_sbs_60_t_0?_encoding=UTF8&psc=1&refRID=VGP30MPMS5ESW7TDCMJC

wheels

we can go with it http://www.ebay.com/itm/Pride-Mobility-Quantum-Jazzy-Jet-Wheelchair-6-Anti-Tip-Solid-Wheels-Tires/112454162899?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D44770%26meid%3D12d4a3f88f1c463aa309fbf3c61e5aa1%26pid%3D100005%26rk%3D1%26rkt%3D3%26sd%3D401341628370

However, we need to see, how we can couple it with motor

Driver

Claran Martis and Harsha Alva can tell you better

once we buy the components or finalise them, we need to design the frame and fabricate it

But if you have problems with fabrication, lack of manufacturing resources and time
I would suggest you buy a second- hand wheelchair like this and then integrate your technology http://www.ebay.com/itm/Pride-Mobility-Quantum-Jazzy-Jet-Wheelchair-6-Anti-Tip-Solid-Wheels-Tires/112454162899?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D44770%26meid%3D12d4a3f88f1c463aa309fbf3c61e5aa1%26pid%3D100005%26rk%3D1%26rkt%3D3%26sd%3D401341628370

Contributions
Akhil Subhash

Gave guidance about batteries

Claran Martis

Excellent Suggestion!

Claran Martis

Claran helped shrey to find best possible motor driver

Harsha Alva

Harsha suggested lipo batteries for the smart wheelchair project

John Rodrigues

Very detailed description of the roadmap with supporting links.

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Claran Martis
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Electronics and Communications Engineer
 · MangaluruIndia
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Yes L298 is better than L293D but I suggest you to avoid any IC based driver circuits. Though some claim to provide high current capabilities, they burn. That’s my personal experience while working with higher power motors. So I highly recommendH bridge with relays as they are simpler.

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Shrey Fadia
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Instrumentation Engineering student -- Hardware and coding Expert (Project Leader)
 · AhmedabadIndia
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Claran Martis Can you show some visuals of it? A circuit diagram or like? Which H-Bridge are you referring to? Even L293D is an H-bridge.

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Claran Martis
33
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Electronics and Communications Engineer
 · MangaluruIndia
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Hi Shrey Fadia this is what I was referring to.https://goo.gl/images/1d4mRR

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Claran helped shrey to find best possible motor driver

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Shrey Fadia
7
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Instrumentation Engineering student -- Hardware and coding Expert (Project Leader)
 · AhmedabadIndia
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Claran Martis Are you sure it will be capable of handling huge current? Because I need to give an output from Arduino/ Voltage regulator.

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Claran Martis
33
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Electronics and Communications Engineer
 · MangaluruIndia
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Hi Shrey Fadia,
Yes, it is capable.
I used the following circuit to drive motors which required 14-15A of current at 12V with Arduino Uno as the controller. But make sure you use thick enough wires, otherwise, they melt or catch fire. I had built my own PCB with thick tracks for this circuit.

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Excellent Suggestion!

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Shrey Fadia
7
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Instrumentation Engineering student -- Hardware and coding Expert (Project Leader)
 · AhmedabadIndia
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Excellent! I am trying to work on this.

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