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

algorithms

SMS alert is sent to local General

Physician & close relative of the patient.

SENSOR (Accelerometer)

SIGNAL CONDITIONING

A – D CONVERTER

MICRO - CONTROLLER

GPRS SIMSMS To

Relative/ Doctor

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

Small, low-profile package

4 mm × 4 mm × 1.45 mm

Low power - 350 μA

Single-supply operation –

1.8 V to 3.6 V

10,000 g shock survival

Excellent temperature

stability

# of Axes: 3

Range: +/- 3g

Sensitivity: 300 mV/g

Output Type: Analog

Typical Bandwidth (kHz):

1.6kHz

Noise Density (µg/rtHz): 300

Supply Current : 350µA

SIM 300 GPRS Modem

Features of SIM 300 GPRS Modem

SIM Card Slot

Input Supply

Filter Capacitor

Power On LED

Network LED

On Board

Mike

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