23-06-2012, 04:47 PM
Heartbeat Monitoring Alert via SMS
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INTRODUCTION
Cardiovascular disease has shown that heart beat rate
plays a key role in the risk of heart attack. Heart disease
such as heart attack, coronary heart disease, congestive
heart failure, and congenital heart disease is the leading
cause of death for men and women in many countries.
Most of the time, heart disease problems harm the elderly
person. Very frequently, they live with their own and no
one willings to monitor them for 24 hours a day.
Previous Work
The authors in [5-7] have adopted PPG techniques in
their design. Researchers [5] presented their idea of a
device being developed for monitoring the cardiovascular
state of the patients. It serves for monitoring the
cardiovascular state of the patients. It stores all the
recorded physiological signals (ECG, PPGphotopletysmograph)
for medical post-processing. They
also proposed that relatives or doctors can be informed by
an automatically sent SMS if in case of critical values of
the measured parameters occurs. However, no further
results on this research are disclosed.
PROPOSED SYSTEM
A. System Block Diagram
the system block diagram used in
designing this project. Hardware development involves
design and development of sensor circuit, PIC circuit and
MAX232 circuit. PROTEUS 7 is used for simulation,
schematic capture, and printed circuit board (PCB)
design. The whole program is written and assembled
using MPLAB IDE [8]. The program is written based on
the PIC16F84A specific instruction in [9].
When finger is placed between LDR and Super-Bright
LED at the sensor circuit, the output is detected at pin 7
of OpAmp LM358. PIC16F84 microcontroller is used to
perform the signal processing from the sensor circuit.
MAX232 connects the microcontroller circuit to GSM
modem via RS232 cable. An alert message will be sent
to mobile phone by modem.
RESULT & ANALYSIS
A. Sensor Device
The LDR is positioned besides the super bright LED in
Fig.2. For simulation purposes, the LDR has been
replaced with push button switch. Whenever light is
detected, the push button is consired ON. Hence, there
will be an output and the green LED will illuminate. The
detectors photo current (AC Part) is converted to voltage
and amplified by an operational amplifier (LM358).
Output is given to another non-inverting input of the
same LM358.