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Design and Development of a Personal Trainer System
Progress Presentation
by
Emer Bussmann
Introduction Exercise is the key to a healthy life importance of personal limits regulate and progress ability to measure, store and track the
progress
The Design of the Proposed System maximum benefit out of training
sessions 1) effective motion sensors for physical
activity assessment 2) Bluetooth-based ECG circuitry 3) low cost portable acquisition system 4) software for monitoring and
processing human body movement
SparkFun Board Bluetooth ECG
sensors
PDA equipped with LabVIEW for data
processing
PC-based Database
Worn by User Bluetooth
LabVIEW8
File Transfer
Fig 3: Block Diagram of system
Accelerometer System
micro-electromechanical device measure acceleration forces (static,
dynamic) change in capacitance antero-posterior, medio-lateral, or
vertical
Solution
WiTilt v2.5 Board from SparkFun Electronics Freescale MMA7260Q triple-axis
accelerometer and a class I Bluetooth link Internal antennae for range
Data acquisition Unit
Acquire and process the signals LabVIEW software to filter, amplify,
rectify and integrate to create clean noiseless output data
Send data to a PC-based database
Solution
Packard iPAQ hw6910/hw6915 Bluetooth type 1.2 and WiFi 802.11b Expansion: mini SD card
Mathematical Basis of the Parameters of Interest
Stride Time Distance Speed Energy expenditure
Stride Time, Distance and hence Speed
vertical bounce (of the hip) in an individual’s step is directly related to the person’s stride length
Step finding algorithm (zero crossing algorithm)
An 8 point moving average is used to search for a maximum peak followed by a minimum
Determine the distance walked
d : distance walked k : constant multiplier max : maximum acceleration value measured in this step min : minimum acceleration value measured in this step avg : average acceleration value for this step accel : represents all measured acceleration values for
the step
completed for each step
Energy expenditure
1) A low pass filter removes the shock noise of moving artefacts,2) Activity x(t) at each axis is determined by integrating the accelerometer signal;
where tau is set to 1s Total activity level is the Vector Magnitude (VM) of the signals; VM = x(t) + y(t) + z(t)3) Every 10s the activity signals were summed
Vertical acceleration the predominant source of signal power
1) Step frequency is estimated using a count of samples between successive zero crossings in the vertical acceleration
2) Another filter is used to remove signals above twice the step frequency
3) VM is averaged at each speed and
4) Gait cycle is normalised to compare signals from different step frequencies
ECG System
maintain a heart rate level that will optimise the effect of physical exercise
use the design of a project from Sweden that is available in the public domain
battery powered measuring up to 3 analogue channels
of ECG on an exercising subject
Amp
Microcontroller
Bluetooth Module
PDAWith LabView
Body Attached Sensors
Analogue Signal
UART SerialConnection Digital Signal
Wireless Fig 7: ECG System
Schematic of ECG system
Progress to date
All of the equipment has been ordered Extensive research Labview8 has been installed on laptop
and currently testing signals from accelerometer
Future work
January:
Construct an ECG monitor February:
Write software to process the accelerometer data
March:
Create a working system
Acknowledgements
I would like to thank my supervisor Professor Gearóid Ó Laighin and PhD researcher Anthony Dalton for all their
help and support.
References
http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&dopt=abstract&list_uids=9216127 … TA accelerometer
http://www.analog.com/UploadedFiles/Application_Notes/47076299220991AN_900.pdf … pedometers using accelerometers
http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/10755/33900/01615295.pdf … energy expenditure and accelerometers
http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/10646/33608/01597820.pdf?arnumber=1597820 … energy expenditure and accelerometers
http://www.brightcity.co.uk/hp_ipaq_6915_pda.htm … PDA
http://www.mobiletechreview.com/HP-iPAQ-hw6915.htm … PDA http://digital.ni.com/public.nsf/allkb/
15987C8CB752EAD786256DC20070B433?OpenDocument … NI for LabVIEW
http://zone.ni.com/devzone/cda/tut/p/id/3260. … NI for LabVIEW http://www.sparkfun.com/commerce/product_info.php?products_id=254 …
Sparkfun
http://forum.sparkfun.com/search.php?mode=results …Sparkfun