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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


    150 TX


    150 RX



    Right Thenar

    Control System

    Left Thenar

    RF Transmitter


    DC Motor (Forwards/Backwards)


    RF Receiver

    DC Motor

    (Left Right)


    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


    Moving Average Filter


    (Finds max value)




    Level Coding

    All on or

    All off

    • Customer Requirements met:

    • Channels distinguished

    • EMG based algorithm

    • Wireless output



    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


    • Final expenditure is


      • 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.


    Do YOU have any Questions?