FALL DETECTION USING SMS
ALERT
AIM

To find effective & timely fall of elderly and paralyzed
patients using our fall detection method which is a
combination of mobile phone & pattern recognition
algorithm.
PHYSIOLOGICAL BACKGROUND
• What is Fall?
 to drop or come down freely
under the influence of gravity
 to drop oneself to a lower or less
erect position
• Types of serious
physiological injury bleeding
 fracture
 centre nervous system damages

• Fall detection methods –
 Video based
 Acoustic based
 Wearable sensor based
• Wearable sensor based
system –
Micro sensors embedded into clothes
Monitor the human activities in real
time
Use of cell phone and intelligent
processing of pattern recognition
SENSOR
(Accelerometer)
SIGNAL
CONDITIONING
A–D
CONVERTER
MICRO CONTROLLER
SMS To
Relative/
Doctor
GPRS SIM
COMPONENTS
SENSOR - Accelerometer
ADXL 335
i.
Front View
ii. Back View
• ADXL 335  small
 thin
 low power
 complete 3 axis accelerometer
 signal conditioned voltage outputs.
Features
Specifications
 3-axis sensing
 # of Axes: 3
 Small, low-profile package
 Range: +/- 3g
4 mm × 4 mm × 1.45 mm
 Sensitivity: 300 mV/g
 Low power - 350 μA
 Output Type: Analog
 Single-supply operation –
 Typical Bandwidth (kHz):
1.8 V to 3.6 V
1.6kHz
 10,000 g shock survival
 Noise Density (µg/rtHz): 300
 Excellent temperature
 Supply Current : 350µA
stability
SIM 300 GPRS Modem
Features of SIM 300
GPRS Modem
 SIM Card Slot
 On Board
 Input Supply
Mike
 Filter Capacitor
 Power On LED
 Network LED
 RJ 45 Connector
 On Board Buzzer
 SMA Female
Connector
Antenna
• SMA male connector and a
helical antenna inside the
structure.
ATmega8 Microcontroller
Bug strip Male
Bug strip Female
7805 Regulator
 Voltage regulator integrated circuit
 The xx in 78xx indicates the fixed
output voltage it is designed for
 Maintains constant +5V regulated
power supply
16 MHz crystal
 Electronic oscillator circuit
 Uses the mechanical resonance of a
vibrating crystal of piezoelectric material
 Creates an electrical signal with a very
precise frequency
 Quartz crystals are used as piezoelectric
resonator
100 µF/16V capacitor
 Conducts alternating current (AC)
 Blocks direct current (DC)
 To store energy
 To filter signals according to their frequency
10K resistor
 Passive two-terminal electrical
component
 Resists the flow of current
12V Rechargeable Battery
One way Jumper wire
CIRCUIT DESIGN
FUTURE Scope
 Fall detection systems need to designed more
accurately to avoid false alarms
 User friendly features needs to be incorporated to
overcome the evolving frustration
ADVANTAGEs
 Automated fall detections using sensors
 Even slight manual intervention of pressing of a button
is not required from elderly & paralytic persons
 Immediate notification of fall detected to local
physician & one close relative of patient
 Cheap & available in affordable rates
 Sensors are reliable & damage proof even when used by
heavy bodied patients
DISADVANTAGEs
 False alarms if generated could be frustrating for
seniors.
 In case of bad network coverage in mobiles SMS alerts
could be delayed.
 Fall SMS Alerts cannot be used with CDMA SIM Cards
CONCLUSION
Fall detection may be necessary for your mother
or father’s situation – even with the potential high rate
of false alarms.
BIBILIOGRAPHY