Transcript introduction

A PRESENTATION
ON DIGITAL HEART BEAT &
TEMPERATURE MONITOR
SUBMITTED BY:Mohit Kumar
Rakesh Kumar
Manoj Kumar
Vikas Kumar dev
(ECE Final year)
G.B.Pant.Engg.College Pauri Garhwal
CONTENTS
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Introduction
Component List
 AT89C2051
 Operational Amplifier Display
 HT12A/HT12E
 Thermistor IC DS1820
Block Diagram of Measuring Device
Transmitting Circuit
Receiving Circuit
Conclusion
Scope for Future Work
Some References
INTRODUCTION
 This project describes the design of a simple, low-cost microcontroller
based heart rate & room temperature measuring device with LCD output.
Heart rate of the subject is measured from the thumb finger using IRD
(Infra Red Device sensors and the rate is then averaged and displayed on a
text based LCD.)
 Project has been enhanced with the temperature detecting components
DS1820 manufactured by DALLAS. The component is used to detect the
room temperature & transmit it to the receiver LCD screen.
 The device alarms when the heart beat & the room temperature exceed the
provided threshold value. This threshold value is defined by the
programmer at the time of programmed the controller 89C2051.The
threshold value given for the project is as 20 to 120 pulse per minute for
heart beat indication & 0 to 55 °C .
COMPONENT LIST
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8-bit Microcontroller (89c2051).
Operation Amplifier (LM 358).
Encoder IC (HT12E).
16x2 LCD.
Buzzer.
Thermistor IC (DS1820).
Resistors, Light Emitting Diode.
MICROCONTROLLER (AT89C2051)
 The AT89C2051 is a low-voltage, high-performance CMOS 8-bit
microcomputer with 4K bytes of Flash programmable and erasable readonly memory (PEROM).
 The AT89C2051 provides the following standard features: 2K bytes of
Flash, 128 bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five
vector two-level interrupt architecture, a full duplex serial
port, a
precision analog comparator, on-chip oscillator and clock circuitry.
 Supports two software selectable power saving modes.
1. The Idle Mode stops the CPU while allowing the RAM, timer/counters,
serial port and interrupt system to continue functioning.
2. The power-down mode saves the RAM contents but freezes the
oscillator disabling all other chip functions until the next hardware reset.
OPERATION AMPLIFIER (LM 358)
 The LM358 series consists of two
independent, high gain ,internally frequency
compensated operational amplifiers which
were designed specifically to operate from a
single power supply over a wide range of
voltages
 Features
 Large dc voltage gain: 100 dB
 Wide bandwidth (unity gain): 1
MHz(temperature compensated)
 Very low supply current drain (500 μA)—
essentially independent of supply voltage
 Low input offset voltage: 2 mV
LIQUID CRYSTAL DISPLAY (LCD)
 A liquid crystal display (LCD) is an electro-optical amplitude modulator
realized as a thin, flat display device made up of any number of color or
monochrome pixels arrayed In front of a light source or reflector.
 Each pixel of an LCD typically consists of a layer of molecules aligned
between two transparent electrodes, and two polarizing filters, the axes of
transmission of which are (in most of the cases) perpendicular to each
other. With no liquid crystal between the polarizing filters, light passing
through the first filter would be blocked by the second (crossed) polarizer.
HT12A/HT12E
 The 212 encoders are a series of CMOS LSIs for remote control system
applications. They are capable of encoding information which consists of N
address bits and 12_N data bits. Each address/data input can be set to one
of the two logic states. The programmed addresses/ data are transmitted
together with the header bits via an RF or an infrared transmission medium
upon receipt of a trigger signal. The HT12A additionally provides a 38kHz
carrier for infrared systems.
 Feature
 Operating voltage
 2.4V~5V for the HT12A
 3.4V~12V for the HT12E
 Low power and high noise immunity CMOS technology
 Low standby current: 0.1_A (typ.) at VDD=5V
 HT12A with a 38kHz carrier for infrared
Transmission medium
THERMISTOR IC DS1820
 The thermistor is , as the name implies a temperature – sensitive resister :
That is , its terminal resistance is related to its body temperature . It is not a
junction device and is constructed of Ge, Si , or a mixture of oxide of
cobalt, nickel etc. The compound employed will determine the device has
a positive or a negative temperature coefficient.
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Feature
Power supply range is 3.0V to 5.5V
Measures temperatures from –55°C to +125°C (–67°F to +257°F)
accuracy from –10°C to +85°C
Alarm search command identifies and addresses devices whose
temperature is outside of programmed limits (temp. alarm
condition).
BLOCK DIAGRAM OF MEASURING
DEVICE
HEART BEAT & TEMPERATURE
MONITOR WITH A TRANSMITTING
CIRCUIT
HARDWARE IMPLEMENTATION OF
TRANSMITTING CIRCUIT
RECEIVING CIRCUIT
HARDWARE IMPLEMENTATION OF
RECEIVING CIRCUIT
CONCLUSION
Lists of Accomplishments Include :
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Acquiring biological signal
Adequately amplifying biological signal
ADC conversion of analog signal
Semi functional heart rate counter
Functional notification and alarm system
Low cost thermistor for measuring room temperature.
LCD heart rate display
Use of low power components for battery operation
SCOPE FOR FUTURE WORK
The device can be improved in certain areas as listed below:
 A graphical LCD can be used to display a graph of the change of heart
rate over time
 Sound can be added to the device so that a sound is output each time a
pulse is received.
 The maximum and minimum heart rates over a period of time can be
displayed.
 Serial output can be attached to the device so that the heart rates can be
sent to a PC for further online or offline analysis.
REFERENCES
 Dr. A.K. GAUTAM “Antenna and Wave propogation” S.K Kataria &
Sons Publishers, Fourth Edition 2008 – 09.
 Dr.S.K. Sahwaney”Electronics Measurement and instrument.
 Robert L. Boylestad “Electronics Device and Circuit Theory by “
 Communication System by: B.P. Lathi.
 S. Edwards., “Heart rate Monitor Book”, Leisure systems international,
Dec. 1993.
 M. Malik and A. J. Camm., “Heart Rate Variability”., Futura Publishing
Co. Inc., sept. 1995.
 J. R. Hampton., “The ECG In Practice”., Churchill Livingstone., Mar.
2003.
 A. R. Houghton and D. Gray., “making sense of the ECG”., Hodder
Arnold Publishing.m 2003.
Continue……..
 Forerunner 201/301 User Guide,
Web site: http://www.grmin.com
 Pulsar heart rate monitors,
Web site: http://www.heartratemonitor.co.uk
 Cosy Communications
Web site: http://cosycommunications.com
 Microchip
Web site: http://microchip.com
 PROTON+ User Guide,
Web site: http://www.crownhill.co.uk
Continue………
 American Heart Association. “Cardiovascular Disease Statistics” [Online
Document], 2008 [Cited 9 Dec 2008], Available HTTP:
<http://www.americanheart.org/presenter.jhtml?identifier=4478>.
 Centers for Disease Control and Prevention. “Heart Disease Facts and
Statistics” [Online Document], 10 Sept 2008 [Cited 4 Dec 2008],
Available HTTP: < http://www.cdc.gov/heartdisease/statistics.htm>.
 R.S. Khandpur. Biomedical Instrumentation:
Applications, McGraw-Hill Companies, Inc., 2005.
Technology
and
 V. Virgilio. “Prototype of a Portable ECG Monitoring System (Holter
Monitor) with Real Time Detection of Beat Abnormalities”, Master thesis,
Aalborg University, 2006.

J. Hailong, M. Bing. “Design of Holter ECG System Based on MSP430
and USB Technology” IEEE (2007) 976-979.
Thank You…….