International Journal of Engineering Trends and Technology- Volume3Issue3- 2012
Human Physical Activity Measuring System
V.Jagadeesh#1, P.Padamaja*2, C.Archana#3
#
Electronics and communication engineering, Assistant professor, MITS, Madanapalle-517625,
Andhra Pradesh, India.
*
Assistant professor, SVEC, Tirupati-517102,
Andhra Pradesh, India.
3. Zigbee Module
Abstract
The Embedded Based Human Physical activity
Measuring System is proposed in the present project which
analyses the body motions of a user to accurately determine
the exercise intensity. Accelerometer is used to record the
motions of the body in X Y and Z axis and senses the user’s
body motions to give corresponding motion strength. It is
used for measuring postural orientation as well as body
movements. Implementation of project is done in two steps.
Firstly, developing code in embedded ‘c’ for micro controller
to interface with 3-Axis Accelerometer using MPLAB IDE.
Secondly Software is developed to prepare the profile in the
PC as per the data received from wearable module.
Keywords
3-axis Accelerometer, Micro Controller, Zigbee,
MPlab IDE.
I. INTRODUCTION
The Growth in the elderly population will pose great
pressure on the healthcare system to treat common geriatric
problem [1]. Preventive approaches like encouraging
elderly people to perform physical exercises can decrease
the risk of developing chronic diseases [2]. Excessive
exercises performed by Sportsmen leads to severe
problems. Lack of physical work or excessive physical
exercise is undesirable [3],[4]. The present scenario of
modern world demands balanced physical work which
needs record on daily basis.
II. HARDWARE IMPLEMENTATION
Our project consists of the following hardware modules as
shown in the fig. 1 and fig. 2.
1.
2.
16f873a PIC Microcontroller
Accelerometer
ISSN: 2231-5381
The Fig. 3 consists of 16f873a PIC
Microcontroller, ADXL335 Accelerometer [5] and Zigbee
Modules. PIC Micro Controller [6], [8], [9] is a 10 bit
micro controller with 72 Kbytes of programming memory
and has three ports namely PORT A, PORT B, PORT C.
The three axis Accelerometer is connected to PORT A of
the micro controller of pins P.1^2, P.1^3, P1.^4
respectively. The supply of 5V is used for the operation of
circuit. The output is taken at the 17 pin of the micro
controller.
Zigbee [11] is a wireless communication used to
transmit the data between the microcontroller and the pc.
Zigbee module contains 20 pins and out of which we use
only four pins. The pin used is first pin, second, third and
tenth pins. A power Supply of 3.3 V is given to the first pin
of Zigbee. Second pin DOUT acts as a transmitter and third
pin DIN/ CONFIG acts as a receiver. The output from the
17 pin of the micro controller is given to the third pin of the
Zigbee. Zigbee transmits the data received from the
microcontroller.
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International Journal of Engineering Trends and Technology- Volume3Issue3- 2012
Fig. 3 Circuit Diagram
III. SOFTWARE REQUIREMENTS
In this project the program is written in Embedded
‘C’ and it is compiled with the help of MPlab compiler [7].
The obtained hex file is programmed into the
microcontroller with the help of Microbrn [10].
7.
If not the process will continue, until the counter
reaches the set value.
A. FLOW CHART
The following fig. 4 and fig. 5 shows flow chart for our
program
Software implementation is explained as follows
1.
2.
3.
A Program is written in Embedded C.
The Written Embedded C program is executed
with the help of MPlab Compiler.
The Obtained HEX file is programmed into the
microcontroller with the help of Microbrn.
Software Implementation can be explained as follows:
1.
2.
3.
4.
5.
6.
Reading acceleration in X, Y and Z directions.
Sending X, Y and Z values through Zigbee
module.
The process will repeat for a while.
At the receiving side, the Zigbee module will
receive the X, Y and Z values.
Increment the counter
As the counter reaches the set value, the profile
will be created
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International Journal of Engineering Trends and Technology- Volume3Issue3- 2012
IV. RESULTS
A. TYPICAL PERFORMANCE CHARACTERISTICS
1) Reading of X, Y and Z at Static Condition:
Fig. 6 X Y and Z axes data at Static Condition
Fig. 4 Flow Chart for Transmitting Data
The above Fig. 6 shows the X, Y and Z axes data
at Static Condition. As the device is in Static Mode, there
will not be any deviation in all the axes. The readings will
be a horizontal line without any deviation.
2) Reading of X, Y and Z while walking:
Fig. 7 X Y and Z-axis data while walking
The above fig. 7 shows the X, Y, Z axes data while
walking there will be deviation because of the dynamic
motion. There will be some deviation in X, Y and Z axes
because of Walking.
Fig. 5 Flow Chart for Receiving Data
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International Journal of Engineering Trends and Technology- Volume3Issue3- 2012
3) Reading of X, Y and Z while Jagging:
5) Reading of X, Y and Z while moving in bike:
Fig. 8 X, Y and Z-axis data while Jagging
Fig. 10 X, Y and Z-axis data while moving in bike
The above fig. 8 shows the X, Y and Z axes data
while Jagging. There will be more variation because of
Jagging. In the above figures we can see the variations in
X, Y and Z axes respectively.
The above fig. 10 shows the readings of X, Y and
Z axes respectively while moving in Bike.
4) Reading of X, Y and Z while Running:
Fig. 11 Experimental Setup \
V. ADVANTAGES
Fig. 9 X, Y and Z-axis data while running
The above fig. 9 shows the readings of the X, Y
and Z axes data respectively while running. There will be
more variation because of running in all the axes.
1.
2.
3.
4.
5.
Portability
Repeatability
Works under different lightening conditions
Reliable
Easy to use
VI. APPLICATIONS
1. The device has simple structure, high precision and
efficiently to measure the exercise intensity of any Physical
activity.
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International Journal of Engineering Trends and Technology- Volume3Issue3- 2012
2. The device is suited for all the physical activities such as
Walking, running and so on.
3. This device can be used any one and use any number of
times.
4. This device can be used by the sportsmen, old people
and anyone who wants to be fit.
VII. CONCLUSIONS
The Human Activity Measuring System has been
developed using ADXL335 Accelerometer, 16f873 PIC
Microcontroller and Zigbee Module. The motion Strength
of the person is recorded and profile is created accurately.
REFERENCES
[1]
C. J. Caspersen, K. E. Powell, and G. M. Christenson,
“Physical activity, Exercise and physical fitness: Definitions
and distinctions for health Related research,” Public Health
Rep., vol. 110, pp. 126–131, 1985.
[2]
R. E. Laporte, H.J. Montoye, and C. J. Caspersen, “Assessment
of Physical activity in epidemiological research: Problems and
prospects,” Public Health Rep., vol. 200, pp. 131–146, 1985.
[3]
G. A. L. Meijer, K. R. Westerterp, F. M. H. Verhoeven, H. B.
M.Koper, and F. ten Hoor, “Methods to assess physical activity
with special Reference to motion sensors and accelerometers,”
IEEE Biomed. Eng., vol. 38, pp. 221–229, 1991
[4]
H. Montoya, R. Washburn, S. Servais, A. Ertl, J. G. Webster,
and F. J. Nagle, “Estimation of energy expenditure by a
portable accelerometer,” Med. Sci. Sports Exerc. vol. 15, pp.
403–407, 1983.
[5]
www.analog.com/httpstatic/imported-files
/data_sheets/ADXL335.
[6]
www.datasheetcatalog.com/datasheet/P/PIC16F873A.shtml
[7]
www.control.com.sg/at_commands_sms.aspx
[8]
www.datasheetdir.com/P89V51RD2%2B8051
[9]
www.microcontrollershop.com/product_info
[10]
ww1.microchip.com/downloads/en/DeviceDoc/
51281d.pdf
[11]
eetimes.com/design/communications-design/4017853/ZigBeeWireless-Technology-for-Low-Power-Sensor-Networks
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