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Project leader: Benjamin Danziger , EE Todd Bentley, ISE Jim Corcoran, CE Jay Radhakrishnan , EE Peter Drexel, EE Vianna Mullar , EE. Wireless Assistive Control System. Video. Agenda. Project Criteria . Mission: Prove a control system can model bio-signals

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Wireless assistive control system

Project leader: Benjamin Danziger, EE

Todd Bentley, ISE

Jim Corcoran, CE

Jay Radhakrishnan, EE

Peter Drexel, EE

ViannaMullar, EE

Wireless Assistive Control System




Project criteria
Project Criteria

  • Mission: Prove a control system can model bio-signals

  • Goal: Design an interactive proof of concept that prospective students can use at open houses

  • Purpose: show off the Biomedical Engineering Option

    Must be safe and robust!

  • Commissioned by the Electrical Engineering Department


  • Project overview
    Project Overview

    • RC Vehicle controlled by Electromyographic (EMG) signals

    • Convert surface EMG signals from human muscle to computer commands

    • Send commands wirelessly to an RC Vehicle


    Customer requirements
    Customer Requirements

    • Strap

      • Eliminate movement artifact/transients/noise

      • Simplify electrode application

    • Signal Processing

      • Properly distinguish between the muscle groups

      • Robust Control Algorithm

      • Wireless Output

    • RC Vehicle

      • Bio-signals must control the vehicle's movements

      • Visual and Audible feedback


    System architecture
    System Architecture

    Right Bicep

    Left Bicep

    BioRadio

    150 TX

    BioRadio

    150 RX

    USB

    Filter

    Right Thenar

    Control System

    Left Thenar

    RF Transmitter

    Lights

    DC Motor (Forwards/Backwards)

    MicroProcessor

    RF Receiver

    DC Motor

    (Left Right)

    Audio


    Design summary front end
    Design Summary: Front End

    • Strap Design

      • Originally wanted glove-like design

      • Infeasible – 25 dimensions on human hand and arm

    • Anthropometric Design

      • Adjustable from 5th thru 95th percentile body types.

      • Expedites application of EMG sensors.

    • Nylon material construction

      • Incredibly durable

      • Nylon tubing hides wires and prevents movements


    Design summary front end1
    Design Summary: Front End

    • EMGs

      • Non-invasive, uses surface electrodes

    • Institute Review Board (IRB)

      • Need approval for human testing

    • Use of BioRadio

      • Collects up to 8 bio-signal channels (we’re using 4)

      • Safely collects all data

      • Transmits the data wirelessly


    Data acquisition testing
    Data Acquisition Testing

    • Acquired data from 5 males and 5 females

      • Recorded Body Mass Index (BMI)

        • Tested Normal Weight, Overweight and Obese

      • Asked if they went to the gym

    • Ensured action could be performed and recorded by BioRadio150 on all individuals

    • Observe Crosstalk

    • Tested strap

    • Confirmed EMG frequency range

    • Fatigue Factor

    Muscle A

    Muscle B


    Design summary signal processing
    Design Summary: Signal Processing

    Custom

    Moving Average Filter

    Normalization

    (Finds max value)

    Difference

    (Forward-Reverse)

    (Right-Left)

    Level Coding

    All on or

    All off

    • Customer Requirements met:

    • Channels distinguished

    • EMG based algorithm

    • Wireless output

    Data

    Packet


    Design summary rc vehicle
    Design Summary: RC Vehicle

    • Receives commands by an RF Receiver

    • Powered by 6 NiMH AA batteries

    • Uses a ATtiny2313 Microprocessor

    • Uses two DC motors (one for turning, one for acceleration), each with its own H-bridge

    • Visual Feedback: Uses LED system

    • Audible Feedback: ChipCorder IC is used to play different sound effects correlating to the user’s actions


    Design summary rc vehicle1
    Design Summary: RC Vehicle

    Light Scheme on RC Car


    Full system testing
    Full System Testing

    • Live System Tests

      • Used all members of the team and several IRB participants

      • Ensured all 4 commands were functional

      • Drove car around the Wetlab


    Budget
    Budget

    • Final expenditure is

      $411.32

      • Initial cost was $339.59

      • Does not include the BioRadio

      • Budget~ $1000



    Difficulties and future improvements
    Difficulties and Future Improvements

    • Future Improvements:

      • Electrode Pairs

      • Implement DSP

      • Use servo instead of DC motor

      • RC Vehicle with sharper turning radius

    • Difficulties:

      • Obtaining a clean signal

      • Parallel processing in “Real time”


    Final summary
    Final Summary

    • Meets all Customer Requirements

    • Within budget

      • Cost= $411.32

      • Budget~ $1000

    • We will let YOU determine if it’s a success.


    Questions
    Questions?

    Do YOU have any Questions?