Download Body Movement Recognition System

Design and Implementation of Body Movement Recognition System
ABSTRACT: In this project body movement
body movement recognition system based
recognition system based on the Non-vision
on the non-vision is that different type
over the Zigbee Wireless Sensor Network.
sensors are added and located at patient’s
Now a day's always (day and night time)
body for getting the postures and activity
vision based coma, paralysis patient’s
from users.
gathered
The studies of the non-vision based on
difficult. So, By using this project Non
the 3-axis accelerometer sensors are added
vision based different wearable type sensors
and located on the body, thighs, and shanks
(flex, 3-axis accelerometer, heart beat)
to detect the body postures. Flex sensors are
arranged on patient body
located on the fingers, elbow, Knee (any
posture
information
can
be
for getting the
and
bending part) to detect bending movement.
always displayed on pc by using Zigbee-
This heart beat sensor is designed to give
WSN
this
digital output of heat beat when a finger is
information give better treatment to the
placed inside it. The wearable digital
patient. These sensors arranged at users
sensors, which own the characteristics of the
hand, leg, body, head such that the posture
washable, comfortable, and low power-
information can be gathered by them.
consumption,
Moreover, under our presented ZigBee-
postures
information
technology.
automatically
Doctors
using
small
size,
easy
implementation,
and
simple
signal
WSN system with small size, low-power
processing,
designed
consumption,
monitoring and detecting the application of
and
high-reliability
characteristics, the data-controlling center
can simultaneously tele - monitor the realtime body interactive postures of persons.
are
for
posture
the breathing frequency.
ZigBee is a kind of wireless sensor
network
technology,
which
has
many
advantages, such as data transmission
I. INTRODUCTION
security,
Presently, It’s can be applied to the
fields
of
apparatus,
3D
animation,
medical
treatment
amusement
Physical
therapy, and health care. The design of the
high
reliability,
flexible
networking, low cost, long battery life and
etc. The fourth in the series, WPAN Low
Rate ZigBee is the newest and provides
Specifications for devices that have low data
rates consume very low power and are thus
In fig 1 the transmitter section of the
characterized by long battery life. Other
system
standards like Blue tooth and IrDA address
controller, which is interfaced with the 3-
high data rate applications such as voice,
axis accelerometer, flex, heart beat sensors
video and LAN communications.
as input and Zigbee, LCD output modules,
II. WORKING MECHANISM
is a wireless technology around the IEEE
wireless
protocol.
of
an
ARM
Micro
the controller acts as an intermediate
The proposed method mainly Zigbee
802.15.4
consists
3-axis
accelerometer sensors are located on the
medium between both of them. Each user
owns one sensor, which can get the postures
from user and then Zigbee transmitter
transmits data received from the controller.
body. The parameters that determine its
position are 3 rotational angles θ, which are
Fig 2: Design and Implementation of Body
defined as the angle between the gravity and
Movement Recognition System Receiver
x-y-z plane. Heart beat sensors are used to
measure beats per minute and Flex sensor
used to detect finger’s folding.
BLOCK DIARAM:
Fig 1:Design and Implementation of Body
Movement Recognition System Transmitter
In fig 2 Zigbee receives the
information
from
transmitter
and
the
received information is displayed on PC
through RS-232 interfacing unit. The data
displayed on LCD also.
Finally, there is one wireless sensor node
III SENSORS DESIGN:
with the ZigBee-WSN function located on
Fig 3. (a) Configuration of sensors
and device. (b) The wireless sensor
node and its physical dimension.
the navel center as shown in Fig. 3(b). This
wireless sensor node is also called multi-IO
(Input-Output) platform since it can get
many IOs from the sensors.
IV. SENSOR MODULES:
FLEX SENSOR:
The Flex Sensor patented technology
is based on resistive carbon elements. As a
variable printed resistor, the Flex Sensor
achieves great form-factor on a thin flexible
substrate. When the substrate is bent, the
The
topology
configuration
of
sensor
produces
a
resistance
output
sensors, which are used to get the posture
correlated to the bend radius—the smaller
information from the wearing person, and
the radius, the higher the resistance value.
one sensor device, which is used to transmit
Custom designed to match customer
these sensor signals simultaneously, is
specs High level of reliability, consistency,
shown in Fig. 3 (a). Five3D (3-axis)
repeatability harsh temperature resistance
accelerometer sensors, namely RH-3DA,
Variety of flexible or stationary surfaces for
LH-3DA, BD-3DA, RL-3DA, LL-3DA, are
mounting Infinite number of resistance
located on the right-hand, left hand, body,
possibilities. A UN flexed sensor has a
right leg, and left leg, respectively, tube
nominal resistance of approximately 10,000
marked by “A”, and then can get the
ohms (10 K). As the flex sensor is bent in
movement angle information from them.
one
Moreover, six flex type sensors are located
increases. Range of resistance's of the FLX-
on the left elbow, right elbow, left knee,
03 sensor may vary between 10K and 40K
right knee, and left armpit, and right armpit,
depending upon the degree of the flex. The
joints marked by “C”, respectively, which
flex sensor operating temperature is -45F to
can get the bending information from them.
125F.
direction
the
resistance
gradually
Fig4:FlexSensor
MEMS SENSOR:
Fig5 MEMS sensor MMA7260Q
Connection - Pin connector .100" spacing.
The sensor measures 1/4 inch wide, 4 1/2
inches long and only .019 inches thick!
The
MMA7260Q
is
3-axis
accelerometer .An accelerometer measures
acceleration (change in speed) of anything
Electrical Specifications:
that
1. Flat Resistance: 10K Ohms
it's
mounted
on.
Single
axis
accelerometers measure acceleration in only
one direction. Dual-axis accelerometers are
2. Resistance Tolerance: ±30%
the most common measure acceleration in
3. Bend Resistance Range: 60K to 110K
Ohm
4.
two directions, perpendicular to each other.
Three-axis
Power
Rating:
0.50
continuous.1 watt peak
Watts
accelerometers
measure
acceleration in three directions.
Accelerometers are very handy for
measuring the orientation of an object
Mechanical Specifications:
relative to the earth, because gravity causes
all objects to accelerate towards the earth. A
1. Life Cycle: >1 million
2. Height: 0.43mm (0.017")
two-axis accelerometer can be used to
measure how level an object is. With a
three-axis accelerometer, you can measure
an object's acceleration in every direction.
This
graph
shows
the
X
axis.
The
accelerometer starts level, and then is tilted
to the left, then to the right, then level again.
If you were using the accelerometer to
navigate in a virtual 3D space, you'd have to
factor in the sudden decelerations that occur
at the end of moving up or down, or the
virtual object you're moving would probably
This graph shows the Y axis. The
have a very bouncy movement. Radius - the
accelerometer starts level, and then is tilted
smaller the radius, the higher the resistance
forward, then back, then level again.
value.
HEART BEAT SENSOR:
This heart beat sensor is designed to
give digital output of heat beat when a finger
is placed inside it. This digital output can be
connected to microcontroller directly to
measure the Beats per Minute (BPM) rate. It
works on the principle of light modulation
by blood flow through finger at each pulse.
This graph shows the Z axis. The
accelerometer is kept level, but raised up in
a quick motion, then lowered quickly.
Moving up produces a sudden increase in
force (and voltage) followed by a sudden
decrease when the movement's stopped, then
finally the voltage levels out again. Moving
down has the opposite effect.
The sensor consists of a super bright
red LED and light detector. The LED needs
to be super bright as the light must pass
through finger and detected at other end.
Now, when the heart pumps a pulse of blood
through the blood vessels, the finger
becomes slightly more opaque and so less
light reached the detector. With each heart
pulse the detector signal varies.
altogether. Since our system applies the high
flexibility of the digital textile sensors and
small-size 3D accelerometer as the major
devices, this designed system owns the
wearable properties. Moreover, users can get
the more freedom space during specific
sport for transmitting the body information
Fig 7 SIGNAL VIEW
by ZigBee-WSN. Moreover, under our
presented ZigBee-WSN system with small
size, low-power consumption, and highreliability
characteristics,
the
data-
controlling center can Simultaneously telemonitor the real-time body interactive
postures of persons. We believe that our
wearable
system
can
be
applied
to
interactive multi-persons games, gymnastics
sports, rehabilitation activities, etc.
Fig.7 shows actual heart beat received by
detector (Yellow) and the trigger point of
sensor (Red) after which the sensor outputs
digital signal (Blue) at 5V level.
V. CONCLUSION
Using the non-vision applications to
capture the body postures, we present the
novel
wearable
system
with
the
3D
accelerometer and Flex, heart beat sensors
for effectively capturing the body posture
information. From our results, our wearable
system can fully distinguish out 28 kinds of
hand postures and 13 kinds of leg postures
VI. REFERENCES
1. H. Hz and H. Hu, "Human motion
tracking for rehabilitation - Asurvey".
Biomedical Signal Processing and Control,
Vol. 3, no. 1,pp.1-18, 2008.
2. E. Farella, A. Pieracci, A. Acquaviva, and
L. Benini, “A Wireless Body Area Sensor
Network for Posture Detection" Computers
and Communications, 2006. ISCC '06.
Proceedings. 11th IEEE Symposium on,
2006.
3. T. D. Bui and L. T. Nguyen,
“Recognizing Postures in Vietnamese Sign
Language With MEMS Accelerometers,”
Sensors Journal, IEEE Volume 7, Issue 5,
May 2007.
4.
3D
Accelerometer
sensors,
http://www.memsic.com