Project leader: Benjamin Danziger, EE Todd Bentley, ISE Jim Corcoran, CE Jay Radhakrishnan, EE Peter Drexel, EE Vianna Mullar, EE

Customer Requirements System Architecture Project Overview Front End Strap Bioradio Testing Signal Processing RC vehicle Design SummaryBudgetSchedulingFuture ImprovementsFinal Summary

 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

 RC Vehicle controlled by Electromyographic (EMG) signals  Convert surface EMG signals from human muscle to computer commands  Send commands wirelessly to an RC Vehicle

 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

Filter Control System USB RF Transmitter RF ReceiverMicroProcessor DC Motor (Forwards/Backwards) DC Motor (Left Right) Lights Audio Right Bicep Right Thenar Left Bicep Left Thenar BioRadio 150 TX BioRadio 150 RX

 Strap Design  Originally wanted glove-like design  Infeasible – 25 dimensions on human hand and arm  Anthropometric Design  Adjustable from 5 th thru 95 th percentile body types.  Expedites application of EMG sensors.  Nylon material construction  Incredibly durable  Nylon tubing hides wires and prevents movements

 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

Muscle A Muscle B 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

Custom Moving Average Filter Normalization (Finds max value) Difference (Forward-Reverse) (Right-Left) Level Coding All on or All off Data Packet Customer Requirements met: Channels distinguished EMG based algorithm Wireless output

 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

Light Scheme on RC Car

 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 $  Does not include the BioRadio  Budget~ $1000

Strap prototyping completed end of week 5 Had motion and control end of week 7, preliminary demo for customer IRB testing completed end of week 9Final construction of RC car prototype by week 10

 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”

 Meets all Customer Requirements  Within budget  Cost= $  Budget~ $1000  We will let YOU determine if it’s a success.