Plotting data from a CSV file

At the beginning of the chapter, we created a CSV file from Arduino data. We will be using that SensorDataStore.csv file for this section. If you recall, we used two different sensors to log the data. Hence, we have two arrays of values, one from a digital sensor and another from the analog one. Now, in the previous example, we just plotted one set of values for the y axis. So, how are we going to plot two arrays separately and in a meaningful way?

Let's start by creating a new Python program using the following lines of code or by opening the plotCSV.py file from this chapter's code folder:

import csv
from matplotlib import pyplot

i = []
mValues = []
pValues = []

with open('SensorDataStore.csv', 'r') as f:
    reader = csv.reader(f)
    header = next(reader, None)
    for row in reader:
        i.append(int(row[0]))
        pValues.append(float(row[1]))
        if row[2] == 'True':
            mValues.append(1)
        else:
            mValues.append(0)

pyplot...