Heartbeat waveform plotter for SpO2 Assistant

readme.md

This script plots the waveform CSV files saved by SpO2 Assistant software.

I have the HUGECARE CMS 50D+ Blue Finger Pulse Oximeter and SpO2 Assistant Version 3.0.4

When powered on and connected to the computer software and recording, it creates filenames with names like:

• _20191016235323.txt - Patient information
• _20191016235323.SpO2 - binary format
• _20191016235323.csv - SpO2 and pulse rate over time
• _20191016235323_wave.csv - Raw waveform data

You want the last *_wave.csv file. This script plots the raw waveform file as a 6-row plot of 15 seconds each, so 2.5 minutes total.

heart_wave_plotter.py

from pandas import read_csv
import matplotlib.pyplot as plt
import numpy as np

filename = '20181113000029_wave.csv'
offset = 0  # In samples, the point at which you want the plotting to start

data = read_csv(filename)
data = data[offset:]

fs = 60  # samples per second

fig, axs = plt.subplots(10, 1, figsize=(11, 7), sharex=True)

chunk_len = 15  # seconds

chunk_size = chunk_len * fs

for n, ax in enumerate(axs):
    chunk = data[chunk_size*n:chunk_size*n+chunk_size]
    try:
        ax.plot(np.linspace(0, chunk_len, chunk_size), chunk['Wave'])
        ax.margins(0, 0.1)
        ax.tick_params(labelleft=False)
    except ValueError:
        pass

plt.xlabel('seconds')

#plt.tight_layout()
plt.subplots_adjust(0.01, 0.07, 1-0.01, 1-0.05)
plt.savefig(filename[:-4] + '.png')

Example output: (red dots were added afterward)