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

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Outline of the Frame Schedule 40 6063 T6 Aluminum pipe

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

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

Surface Area:

Maximum pressure:

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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 °

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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 °

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The Electronic Sensor SystemThe Processor

•The Arduino UNO

•Robust

•8-bit microcontroller

•14 digital pins and 6 analog pins

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The Accelerometer for Gait Assistance

ADXL345

Measurement range: ±2, ±4, ±8, ±16 g

Resolution: 3.9mg/LSB (10bits)

Acceleration: 0.52g

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The Accelerometer for Gait Assistance

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The Ultrasonic Range Finder HC-SR04 Ultrasonic distance measuring sensor

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Mechanism

Sensor 1 : Upper body distance from the frame.

Sensor 2: Lower body distance from the frame.

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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:

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The Frame

55.9cm×45.7cm×99.1cm

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Flow Chart: Standing-up Support

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Flow Chart: Gait Assistance

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Wiring Diagram and Power Calculations

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The Arduino pins draws most of the power9V DC battery

Parts and Costs - Frame

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

Parts and Costs - Electronics

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

Total price: $335Total weight: 6.07kg

Assembly

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Electronics Mounting

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Conclusion and Next StepsBasic functions achieved

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

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