PowerPoint Presentation

HEART BEAT MONITOR(USING IC PIC16F72) Presenting byGirish Kumar S MGanesh Kumar J RBhanuprakash CNarayana Swamy KShaik Saif UllaSubramani Y NSubramani SMadhu M S

Guiding by:-Mr. M. ANANTHRAMMESelection Grade LecturerDepartment of Electronics and communication engineering

welcome

INTRODUCTIONHeart rate measurement indicates the soundness of the human cardiovascular system. This project demonstrates a technique to measure the heart rate by sensing the change in blood volume in a finger artery while the heart is pumping the blood. Heart rate can be measured either by the ECG waveform or by the blood flow into the finger (pulse method). The blood flow into the finger can be sensed photo electrically. To count the heart beats, here we use a small light source on one side of the finger (thumb) and observe the change in light intensity on the other side.

Digital / Optical Hear Rate Sensor Interfacing (No need any circuit calibration)Heart rate Sampling Time = > 20 (15) seconds3 digit seven segment LED DisplayOn board LED indicator for Heart PulseOn board Start-Stop and Reset SwitchesMicrocontroller based design for greater flexibilityOperating voltage 9 to 12V DCOperating current 500 ma (Approx.)Diode protection for reverse polarity connection of DC supply to the PCBOnboard regulator for regulated supply to the kitSpecifications And Features:

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The block diagram consists of following functional blocksMicrocontrollerHeart rate sensorDisplayOscillator

1.Microcontroller (PIC16F72)

Microcontroller is the heart of the circuit which controls all the operations of the circuit using a Microcontroller greatly reduces the components count while providing more features than could be found using dedicated logic ICs. Once the start button pressed the Microcontroller enable the heart rate sensor module for 15 sec during this interval the No. Of pulses arriving in body counted through the sensors.

High performance RISC CPUOperating speed: DC - 20 MHz clock input DC - 200 ns instruction cycle2 ~ 4K FLASH Program Memory,128 bytes of Data Memory (RAM)10-bit multi-channel Analog-to-Digital converterProgrammable code protectionPower saving SLEEP modeSelectable oscillator optionsLow power, high speed CMOS FLASH / EEPROM technology

SPECIAL MICROCONTROLLER FEATURES:

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Heart beat sensor is designed to give digital output of heat beat when a finger is placed on it. When the heart beat detector is working, the beat LED flashes in unison with each heartbeat. 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.

2. Heart rate sensor

A seven-segment display, less commonly known as a seven-segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot-matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters, and other electronic devices for displaying numerical information.

3. Display

A crystal oscillator is an electronic circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. A 4 MHz crystal provides accurate timing and an easily divisible clock source for the internal hardware timers. This high frequency clock source is used to control the sequencing of CPU instruction.4. Oscillators

Heart rate is the number of heartbeats per unit of time and is usually expressed in beats per minute (bpm).In adults, a normal heart beat about 60 to 100 times a minute during resting condition. You can count the number of pulses within a certain interval (say 15 sec), and easily determine the heart rate in bpm.

HEART RATE DETECTION WORKING

The below video shows the demo of our project

ConclusionTodays microcontroller based circuits are used in every field; they are also easy to operate. The microcontroller based heartbeat monitor is used in hospitals and clinics. In this project heartbeat rate can be measured by simple method i.e. just keep finger on the sensor, that will sense and counts heartbeat rate. The disadvantage is the heartbeat sensor works on the principle of amount of blood flows in the finger and that blood flow causes variation in light intensity reaching the photo diode. Some times while measuring blood rate the measured value may be wrong due to external light source.

Thank you Guided by:-Mr. M. ANANTHRAMMESelection Grade LecturerDepartment of Electronics and communication engineering