This PPT helps you to know that how can we design a Heart rate Sensor using LM358 IC. Designing Heart Rate Sensor is very easy and affordable process by using the IC.

1. HEART-RATE
SENSOR
BY: AIJAZ AHMAD LONE
ROLL NO: 1005-19-731031

2. CONTENTS
▪ INTRODUCTION
▪ COMPONENTS
▪ CIRCUITRY
▪ WORKING
▪ CONCLUSION

3. INTRODUCTION
▪ A Heart beat Sensor is a monitoring device that measures the
heart rate i.e. the speed of the heartbeat.
▪ A person’s heartbeat is the sound of the valves in his heart
expanding or contracting as they force blood from one region to
another.
▪ There are two ways to monitor the heart rate:
▪ one way is to manually check the pulse either at the wrists or neck
and the other way is to use a Heartbeat Sensor

4. INTRODUCTION
▪ In this Project , I will show you how to design a circuit that can sense
the heartbeat by using an LM358 IC along with an infrared transmitter
and receiver.
▪ It is a simple and low-cost optical technique that can be used to detect
blood volume changes in the microvascular bed of tissue by using an
LM358 IC along with an infrared transmitter and receiver
▪ The IR transmitter in this circuit is an IR LED and the detector will be a
photodiode.

5. COMPONENTS
▪ The following components are required to make Heartbeat Sensor
Circuit:
▪ Bread Board

6. COMPONENTS
▪ 9V Battery

7. COMPONENTS

8. LM358 IC PINOUT

9. CIRCUITRY OF HEART-RATE SENSOR

10. CIRCUITRY

11. WORKING
▪ Two IR photodiodes will sense the heart pulses in this circuit.
▪ One acts as a transmitter which shines a light into or through your finger
while the receiver measures how much light is reflected or absorbed.
▪ The measured intensity of the reflected rays depends on the heart
pumping rate and on the difference in the oxygenated blood levels inside
the blood content.
▪ The IC used in this circuit is LM358 which has 2 op-amps on the same
chip. The output of the photodiode is given to the non–inverting input of
the first op-amp through a capacitor, which blocks the DC Components of
the signal.

12. WORKING
. The output of the first op-amp is then applied to one of the inputs of the
second op-amp, which acts as a comparator.
. The LED is connected to the output of the second op-amp which can be
obtained at pin 7.
. The rate at which LED flashes shows our heart rate.

13. CONCLUSION
▪ Cost Efficient: This product is cost efficient and easily affordable
compare to other products available in market
▪ User Friendly: User can conduct test by himself.
▪ Highly reliable: Good in quality and performance
▪ Long-Lasting: This product can be used for long time.
▪ Easy to use and manufacture.
▪ The sensor has high sensitivity and gives accurate result.
▪ Easy to maintain

14. REFERENCES
WWW.CIRCUITS-DIY.UK
WWW.TECHNOREVIEW-85.COM
WWW.ACADEMIA.EDU