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O-trotti (Steam Fabrikarium)

To create a universal, and cost-effective power attachment to convert a normal wheelchair to an automated power wheelchair.

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Starting off : A wheelchair attachment to convert a normal wheelchair to a power wheelchair.

Target segment : People who use the wheelchair and have body strength as well.

Limitations : To target a wide market segment and make a power wheelchair
affordable to most sections of society.
DESIGN BRIEF
To design a universal, and cost-effective power attachment to convert a normal wheelchair to an automated power wheelchair.
It should be light, detachable, easy to use, durable and universal.

This power wheelchair-attachment renders their hands free while travelling. They can multitask while travelling as they no longer need to use their hands for locomotion.

This cost-effective O-trotti is estimated to cost less than 5-10k. It’s affordable to most sections of society.

Link where to buy the electric scooter :

Electric scooter  : it cost : ₹18,049 ...

For the next prototype :

5 Wheels at the same time on the floor is too many

Adobe Portable Document Format - 2.17 MB - 02/14/2018 at 09:52

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Standard Tesselated Geometry - 4.83 MB - 02/14/2018 at 06:30

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Portable Network Graphics (PNG) - 329.41 kB - 02/14/2018 at 06:19

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  • 1 × 12 V Dc battery-8 Ah
  • 1 × 12 V 3550rpm Dc motor
  • 1 × Potentiometer(10k ohm)
  • 1 × Battery (24v,9AH)
  • 1 × Chain drive system

View all 12 components

  • TRIAL RUN 1

    rsramyasatish302/14/2018 at 06:51 0 comments

    Results : 

    The mechanism worked hence proof of concept received.

    However when a user sat on the wheelchair it didnt work. 

    Changes made :

    The 5th wheel was earlier positioned at 90* to the ground hence it was bearing all of the human's weight.

    We changed it and placed it at an angle by lowering the metal harness. 

    Success.

  • Mission 2 - The electronics

    rsramyasatish302/13/2018 at 10:58 0 comments

    ELECTRONICS

    Arduino (for controlling speed of motor)

    Female to male wires

    L239n motor driver (for controlling  motor current)

    Spdt switch (for motion control)

    Potentiometer(10k ohm)

    Battery (24v,9AH)

    int enablePin = 11;
    
    int in1Pin = 10;
    
    int in2Pin = 9;
    
    int switchPin = 7;
    
    int potPin = 0;
    
    int statusPin= 13;
    
    void setup()
    
    {
    pinMode(12,OUTPUT);   pinMode(in1Pin, OUTPUT);
    
    pinMode(in2Pin, OUTPUT);
    
    pinMode(enablePin, OUTPUT);
    
    pinMode(switchPin, INPUT_PULLUP);
    
    pinMode(statusPin,OUTPUT);
    
    }
    
    void loop()
    
    {
    
    digitalWrite(12,HIGH);
    
    int speed = analogRead(potPin) / 4;
    
    boolean reverse = digitalRead(switchPin);
    
    setMotor(speed, reverse);
    
    }
    
    void setMotor(int speed, boolean reverse)
    
    {
    
    analogWrite(enablePin, speed);
    
    digitalWrite(in1Pin, ! reverse);
    
    digitalWrite(in2Pin, reverse);
    
    }

  • Mission 1 - Mechanized wheelchair

    rsramyasatish302/13/2018 at 10:51 0 comments

    Creating the first working prototype.

    S T E P S

    -  disassemble the scooter.

    - prepare metal rod harness on the wheelchair 

    - attach the scooter to the wheelchair 

    Product specifications :

    MECHANICS

    Electric scooter parts :

    12 V Dc battery-8 Ah

    12 V 3550rpm Dc motor

    Chain drive system

    Handle frame

    Braking system

    Wheel 

    STEP 2

    As the mechanism fell into place we figured out  the customized joinery that would connect the trotti to the wheelchair. These were modeled on fusion360 and are open source available in the file section of this project.

  • INTRO

    rsramyasatish302/13/2018 at 10:33 0 comments

    Starting off

    A wheelchair attachment to convert a normal wheelchair to a power wheelchair.

    User study :

    4 wheelchair users. 4 interviews.

    From the interviews we concluded that 3 out of 4 preferred to use manual direction. The 4th interview was a girl with muscular dystrophy and hence depended on a joystick.

    We were looking at two different categories of disability and had to narrow down to a more specific target segment.

    Target segment : People who use the wheelchair and have body strength as well.

    Limitations :  To target a wide market segment and make a power wheelchair affordable to most sections of society. 

    D E S I G N  B R I E F

    To design a universal, and cost-effective power attachment to convert a normal wheelchair to an automated power wheelchair. 

    It should be light, detachable, easy to use, durable and universal. 

    DAY 1 

    First half of day 1 was spent on conceptualising and making technical decisions about the

    Product.  : Simple system – single 5th wheel, positioned on the back end with motor, mechanical motion to control direction.

View all 4 project logs

  • 1
    Disassemble an electric scooter.

    We need the front portion handle frame area only., along with the components attached to it. Hence part the front from the restof the scooter, i.e the seating area etc.

    Depending on the scooter selected, 

    Use a 6mm screwdriver to unscrew the parts.

    The following picture depicts where the scooter  will be placed-

  • 2
    Simultaneously, Prepare a metal rod harness on the wheelchair

    The scooter frame needs a harness to be attached to the back of the wheelchair. Prepare this metal harness by cutting it to the correct size depending on the width of the wheelchair.

    Use a metal cutter to cut the metal rod to size.

  • 3
    Attach the scooter to the wheelchair via this metal harness

View all 8 instructions

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