The Smart Walker Project TEAM: CHEN ZHANG, YI LU PRESENTED BY: YI LU.

The Smart Walker ProjectTEAM: CHEN ZHANG, YI LUPRESENTED BY: YI LU

Background 3 million walker users in America

2/3 report limitations in instrumental activities of

daily living

1/3 still need assistance from others

Customer Need and Project Scope

Standing-up support Gait assistance through acceleration

detection At least 2-3 hours of sustain Portable

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

Outline of the Frame Schedule 40 6063 T6 Aluminum pipe

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

Pressure Analysis Walker weight limit: 1.34kN (300lb)

Force on each pipe = 0.68kN/2=0.34kN

Surface Area:

Maximum pressure:

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

Tilt Analysis Take D as the pivot point.

The force exerted on the frame has an angle α from the vertical position.

(contributing factor for tilting)

As long as ˃, the frame will not tilt

α =12.9 °

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

Tilt Analysis (cont’d) Take A as the pivot point

(contributing component for tilting)

As long as ˃, the frame will not tilt.

α =34.1 °

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

The Electronic Sensor SystemThe Processor

•The Arduino UNO

•Robust

•8-bit microcontroller

•14 digital pins and 6 analog pins

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

The Accelerometer for Gait Assistance

ADXL345

Measurement range: ±2, ±4, ±8, ±16 g

Resolution: 3.9mg/LSB (10bits)

Acceleration: 0.52g

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

The Accelerometer for Gait Assistance

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

The Ultrasonic Range Finder HC-SR04 Ultrasonic distance measuring sensor

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

Mechanism

Sensor 1 : Upper body distance from the frame.

Sensor 2: Lower body distance from the frame.

Need and Scope Feasibility Chose Design

DetailsParts and

ManufacturingConclusion

and Next Steps

Performance CalculationMaximum sensing range: 2m

Two sensors attached to the midpoints of pipes

To make sure that the sensors work when the object appears 2m to the edge of the frame:

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion and

Next Steps

The Frame

55.9cm×45.7cm×99.1cm

Need and Scope Feasibility Chosen Design

DetailsParts and

ManufacturingConclusion

and Next Steps

Flow Chart: Standing-up Support

Need and Scope Feasibility Chosen Design Details

Parts and Manufacturing

Conclusion and Next Steps

Flow Chart: Gait Assistance

Need and Scope Feasibility Chosen Design

DetailsParts and

Manufacturing

Conclusion and Next

Steps

Wiring Diagram and Power Calculations

Need and Scope Feasibility Chosen Design

DetailsParts and

Manufacturing

Conclusion and Next

Steps

The Arduino pins draws most of the power9V DC battery

Parts and Costs - Frame

Need and Scope Feasibility Chosen Design

DetailsParts and

Manufacturing

Conclusion and Next

Steps

Price of the frame: $180Weight of the frame: 5kg

Parts and Costs - Electronics

Need and Scope Feasibility Chosen Design

DetailsParts and

Manufacturing

Conclusion and Next

Steps

Price of the electric system: $155Weight of the electric system: 1.07kg

Total price: $335Total weight: 6.07kg

Assembly

Need and Scope Feasibility Chosen Design

DetailsParts and

Manufacturing

Conclusion and Next

Steps

Electronics Mounting

Need and Scope Feasibility Chosen Design

DetailsParts and

Manufacturing

Conclusion and Next

Steps

Conclusion and Next StepsBasic functions achieved

Still needs to improve on functionalities Motor and hydraulic brake combination Gradual speed reduction User profile memory Foldability

Need and Scope Feasibility Chosen Design

DetailsParts and

Manufacturing

Conclusion and Next

Steps