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Senior Project – Electrical Engineering - 2010
Design of a Wireless EMG System
Konstantin Avdashchenko
Advisor – Dr. Shane Cotter
Sample EMG Data
Conception:
This project was put together to create an device capable of receiving and
transmitting EMG signal data. Electromyogram signals exist within the
frequency of 0-200Hz with an amplitude of 20mV approximately. This type
of signal is easy to convert into digital information. This projects goal is to
create a system that would be able to transmit these signals and perhaps
analyze them.
Parts:
http://podiatry.temple.edu/gaitlab/facilities/images/emg_1.g
if
At the time of my initial design plans, I thought it would be best to use a PIC32.
This processor was chosen for its high MIPS (million instructions per second),
built in digital signal processing libraries, and for the familiarity I already had
with other PIC processors. I also chose to use the nRF2401+ sold by Nordic
Semiconductor. This chip runs on the 2.4GHZ range, and has a large following
behind it, so there are many open designs using it and also lots of support for it.
Design:
Rev.2
Rev.1
CMOS based clock
Polygons untied
Direct connections
ICSP for power
Cr2032 Battery source
PIC32
Wire antenna

Board Rev.1
Crystal based clock
Polygon tied to GND
Power signals
Mounting holes
Li-Ion Battery
2.4GHz chip antenna
Expansion port
PIC18f4550
LED Feedback

Transceiver
Schematic Rev.2
Main Controller
To TRX
Board Rev.2
Konstantin Avdashchenko
Results:
For testing my design, I was not able to get Rev.2 Boards in time,
as the turnaround for them is 20 days min from BatchPcb. Instead I
bought an nRF2401+ breakout board, and have been testing code
on that. For the receiving end, I have used the OpenbeaconUSB
device. This device is very similar to my design as it connects an
nRF2401+ through an Arm9 processor to USB. I intend to continue
developing code for this system, So by the time that I receive and
make the Rev.2 Boards, I will have tested code to put onto them.
Future work:
Design and interface between Conor O' Reilly, Joshua Hernandez, and
Travis Hoh's work and mine.
Port Joshua Hernandez's algorithms for signal detection.
Create encryption for signals.
Race an R/C car with it.
Acknowledgements:
-Dr. Shane Cotter -Conor O' Reilly -Joshua Hernandez
-Travis Hoh -Demarcus Hamm -EE Dept -Milosch Meriac -Sparkfun
References:
-Openbeacon.org -Sparkfun.com -BatchPcb.com