HEART RATE MEASUREMENT FROM FINGERTIP

INTRODUCTION ► Heart 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.

BASIC BLOCK DIAGRAM

SYNOPSIS

► Heart rate measurement system that uses optical sensors to measure the alteration in blood volume at fingertip with each heart beat.

► sensor unit consists of an infrared light-emitting-diode (IR LED) and a photodiode.

► IR diode transmits an infrared light into the fingertip and the photodiode senses the portion of the light that is reflected back.

► Intensity of reflected light depends upon the blood volume inside the fingertip.

► So, each heart beat slightly alters the amount of reflected infrared light that can be detected by the photodiode & with a signal conditioning this little change in the amplitude of the reflected light can be converted into a pulse which can counted by MC.

SCHEMATIC

► The schematic consist of two stages:-

1. Input sensing and conditioning circuit.

2. MCU circuit used for counting of pulses & display of output.

INPUT SENSING & CONDITIONING CIRCUIT

MCU AND OUTPUT DISPLAY

MAJOR COMPONENTS USED

► Pic16f628a (MCU):

1. By microchip technology.

2. Smaller instruction set as compared to other MCUs.(RISC based)

3. Low cost with high clock speed.

4. Provide wide range of interfacing.

MAJOR COMPONENTS USED

► MCP602 transistor:

1. Dual package opamp from microchip.

2. Operating voltage-2.7-6V

3. Need Single supply voltage

4. Used in input signal amplification.

► Photodiode and IR diode as sensor unit

► 3 digit 7-segment display

APPLICATIONS AND SIGNIFICANCE OF THE PROJECT

► This project aim at learning the compact and advanced medical technology used in measuring heart rate.

► The project has been widely applied in medical technology , even in heart rate monitoring applications designed for mobile phones.

ESTIMATED COST & SCHEDULING ANALYSIS

► The complete project setup is costing in the range of Rs. 800 to 1000/- *.

► The entire project is scheduled in two phases:-

1. Learning of embedded C programming used.

2. Hardware implementation: Assembling the entire setup on PCB or PCB prototype board.

*(may subject to change due to faulty component of wear and tear).

THANK YOUSamarpit arya(07710102809)

Abhinav choudhary(07610102809)