EE 127 Lab 4

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European Business School - Salamanca Campus *

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127

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Electrical Engineering

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Nov 24, 2024

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pdf

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EE 127 Electronics for Bioengineering Fall 2023 Lab 4: Heart Rate Monitoring Leyla Odoutan Heather Hwang

Introduction The objective of this lab is to get familiar with a heart rate monitoring system and explore its applicability in measuring heart rate. We used an AD8232 heart rate monitor for this purpose, which is a specialized device designed to measure the electrical activity of the heart. Our experiment involves several steps. First, we set up the monitoring system, connected wires to the body, and used computer programs to record and understand heart rate data. We'll start with measuring heart rate and understanding its patterns. Then, we'll see how exercise affects heart rate. We'll also change the way the wires are connected to the body to see what happens . The goal of the lab is to help us understand heart rate monitoring systems and their practical uses both in medical and fitness situations. Lab Procedure and Results Task 1: Experiment Setup To begin the experiment, we connected the "Spark fun Heart Rate Monitoring" module to the Arduino board following the provided instructions. Electrodes were then securely attached, with the black electrode on the right chest, the blue electrode on the left chest, and the red electrode on the right side of the stomach. Next, we uploaded and verified the Arduino code and used Processing 2.2.1 on our computer to display and calculate heart rate. Task 2: Measurements: Display and Calculate Heart Rate In the second task, we used the setup from Task 1 to observe and record the heart rate activity. The resting heart rate was measured, and we noted the pulse pattern.

Figure 1: 92 bpm for heart rate with Arduino Post-Exercise Heart Rate Measurement The same method was used, and the subject engaged in physical activity, running. Immediately after exercise, we recorded the post-exercise heart rate and BPM. We compared these measurements with the resting heart rate to observe the impact of exercise. Figure 2: 133 bpm for heart rate in running Switch the electrodes. We returned to the initial setup described in Task 1. We carefully adjusted the positions of the

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electrodes while maintaining the specified configuration. We recorded the heart rate data under these new electrode positions and compared the results with those from Task 1. Figure 3: Left and right switches for the heartbeat No red electrode The last task was to disconnect the red electrode and observe the differences. Figure 4: Heart rate information when the red electrode is disconnected.

Discussion First, we used Arduino and Processing 2.2.1 to show a person's heart rate. By looking at the pattern on the screen, we figured out that the heart beats 92 times in a minute. We also noticed some important parts of the heart's signal, such as the P wave, QRS complex, and others, which helped us ensure our connections were correct. Following that, we did the same thing but checked the person's heart rate after they exercised. They exercised for a couple of minutes before we measured. When we compared the heartbeat pattern to the previous one, we saw that the heartbeats were taller and faster. Before, there were 92 bpm, but after exercising, there were 133 bpm. For the next step, we changed where we put the wires on the person. By putting the black wire on the left arm and the blue wire on the right arm, the pattern of the heartbeat on the screen flipped upside down. The peaks of the waves are pointing toward the opposite side of the graph. Finally, we took off the red electrode and tried to measure the heart rate. The peaks of the signal are still noticeable but they appear to be more noisy. This circuit helps with the accuracy of the measurement. Without it, the signal becomes distorted because our bodies act like sponges and absorb interference from electrical lines, like how a sponge soaks up water. While working on these exercises, we made changes to the computer code to make sure our heart rate monitoring system worked well. Conclusion: Our experiments with Arduino and Processing taught us how to monitor heart rate effectively. We learned how to calculate heart rate, recognize patterns in the heart's electrical activity, and confirm the accuracy of our connections. These experiences also showed us the impact of physical activity on heart rate and the importance of electrode placement. Additionally, we understood the necessity of a specific circuit for reducing interference noise. These lessons will be useful in future applications and research in biomedical instrumentation. Reference

[1] Lab Manual: EE127 Lab 4: Heart Rate Monitoring, e-Manuscript, Fall 2023

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