Updating a real time plot using Matplotlib

Asked Apr 15 '21 at 09:18

Active Apr 15 '21 at 12:27

Viewed 47 times

I'm trying to generate a real time plot using Matplotlib, with real time gathered data from an Arduino MKR1000. Code:

import serial
import matplotlib.pyplot as plt
import numpy as np

ser = serial.Serial('COM7', 9600)
plt.close('all')
plt.figure(figsize=[10,8])
plt.ion()

data = np.array([])

while True:
    a = ser.readline()
    a = a.decode()
    b = float(a[0:4])
    data = np.append(data, b)
    plt.plot(data)
    plt.pause(0.1)

The output is a new plot created every 0.1 seconds, but I want to update the same real-time plot. Anyone can help? I'm using Python 3 on a Windows 10 system

edited Apr 15 '21 at 12:27

Wang Liang

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asked Apr 15 '21 at 09:18

Davide Semeria

Have you tried calling ion before creating a figure? – Farhood ET Apr 15 '21 at 09:33
Yes, but nothing changes – Davide Semeria Apr 15 '21 at 09:36
If every time you call `ser` (with `ser = serial.Serial('COM7', 9600)`) you receive new data, that should be inside the loop. – David Apr 15 '21 at 16:51

Updating a real time plot using Matplotlib

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