matplotlib example sample (snippet)

Python matplotlib example 'sample'

Functions in program:

def data_gen():
def run(data):
def update(data):

Modules used in program:

import re
import csv
import datetime
import time
import platform
import serial
import matplotlib.animation as animation
import matplotlib.pyplot as plt
import matplotlib as mpl
import numpy as np

python sample

Python matplotlib example: sample

import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import serial
import platform
import time
import datetime
import csv
import re
print("Python version: " + platform.python_version())
print("matplotlib version: " + mpl.__version__)

fig, ax = plt.subplots()
line, = ax.plot(np.random.rand(10))
ax.set_ylim(-.1, .08)
xdata, ydata = [0]*100, [0]*100
SerialIn = serial.Serial("com4",115200)
FILE = open('Pressure ' + time.strftime("%Y-%m-%d %H:%M") + '.csv','a')

pattern = re.compile( r'([0-9 .+-]*)' ) #Added



def update(data):
    line.set_ydata(data)
    return line,

def run(data):
    global xdata, ydata
    x,y = data
    if (x == 0):
        xdata = [0]*100
        ydata = [0]*100
    del xdata[0]
    del ydata[0]
    xdata.append(x)
    ydata.append(y)
    line.set_data(xdata, ydata)
    return line,

def data_gen():
    x = 10
    while True:
        if (x >= 9):
            x = 0
        else:
            x += 0.1

        SerialIn.write(b"P\r")
        try:
            inRaw = re.search( pattern, 
SerialIn.read(SerialIn.in_waiting).decode('utf-8') ).group(0)
            inInt = float(inRaw)
            TIME = time.strftime('%H:%M:%S')
            FILE.write("{0},{1}\r".format(TIME, inInt))
            FILE.flush()
            print('['+time.strftime('%H:%M:%S')+']',inInt)
            time.sleep(1-time.time()%1)

        except:
           inInt = 0

        yield x, inInt

ani = animation.FuncAnimation(fig, run, data_gen, interval=0, blit=True)

plt.show()


SerialIn.close()
FILE.close()

Python links

Learn Python: https://pythonbasics.org/
Python Tutorial: https://pythonprogramminglanguage.com