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PyLab-LongTerm-0301.php    10057 Bytes    26-08-2022 07:46:56


Python Lab Experiments - Datalogger to File #1


Arduino Lab Automation Example / Exercise




View out of my Office :-)

No fancy setup here, so this is the view out of my office @ campus hoenggerberg.




✈ Minimum Equipment List (MEL)




DEVICESREMARKS
Almost any ....mod Devicee.g. Wanmod - must return measurement value
Accessoriese.g. Antenna


We used only Arduino™ based devices here, as this simplifies the Python Script.
(PyVISA is covered in a later exercise).




✈ Goal • learning content




• Control devices in a loop
• Store data with current timestamp
• Load data to verify their integrity




🐍 The Python Script




# -*- coding: utf-8 -*-
"""
Created on Tue Aug 23 09:29:39 2022

Simple Sketch to Log Data from Wanmod into file

@author: Changpuak

"""

import serial
import time
 
 
# PLEASE DON'T FORGET TO CHANGE THE NUMBER OF THE COM PORT
Wan = serial.Serial(port='COM66', baudrate=115200, timeout=.9)

time.sleep(5)           # Arduinos reset, wait to start up

FREQ = 10.7             # MHz
DELTA_TIME = 10         # sec
MAX_POINTS = 20
POINT = 1
FILENAME = 'DATA-2022-08-22-001.txt'

LEVEL = 0
TIMESTAMP = 0
x = []


def CHAT_WANMOD(x):
    Wan.write(x.encode('utf-8'))
    time.sleep(0.5)
    data = []
    line = (Wan.readline())
    while len(line) > 0:
        data.append(line)
        line = Wan.readline()
        line = line.decode('utf-8')
    return data
    

def EMPTY_WANMOD(x):
    time.sleep(1)
    x = b'avanti'
    while x != b'':
        x = Wan.readline()


try:
    print("CREATING FILE ...")
    f = open(FILENAME, 'w', encoding='utf-8')                # CREATE FILE
    f.write('Filename : '+FILENAME+'\n')                     # WRITE HEADER
    f.write('Delay between measurements is '+str(DELTA_TIME)+' seconds.\n')   
    f.write('Start of Recording at t = '+str(time.time())+'\n') 
    f.write('Timestamp (float), Value (float)\n')       
    f.close()
    #
    print("SETUP WANMOD ...")
    CHAT_WANMOD('SETF:'+str(FREQ)+'\n')
    EMPTY_WANMOD(x)
    time.sleep(3)
    EMPTY_WANMOD(x)
    #
    while POINT <= MAX_POINTS:
        print(str(POINT)+' OF '+str(MAX_POINTS)+' ...')
        # GET DATA
        TIMESTAMP = str(time.time())
        LEVEL = str(CHAT_WANMOD('POW?\n'))
        LEVEL = LEVEL[3:-9]
        # WRITE TO FILE
        f = open(FILENAME, 'a', encoding='utf-8')
        f.write(TIMESTAMP+','+LEVEL+'\n')
        f.close()
        time.sleep(DELTA_TIME-2)
        POINT += 1
        
finally:
    Wan.close()
    print("CONNECTIONS CLOSED.")    




✈ The Result : Just a simple file ...




Filename : DATA-2022-08-22-001.txt
Delay between measurements is set to 10 seconds.
Start of Recording at t = 1661172193.0619602
Timestamp (float), Value (float)
1661172201.3296232,-101.65
1661172211.172434,-101.44
1661172221.1670876,-101.06
1661172231.1629498,-101.08
1661172241.1533153,-101.63
1661172251.1480484,-101.25
1661172261.1613867,-101.24
1661172271.1514695,-101.22
1661172281.1606288,-101.34
1661172291.1362023,-101.46
1661172301.1352825,-101.22
1661172311.1336858,-101.43
1661172321.1386282,-101.28
1661172331.1255283,-101.68
1661172341.1282055,-101.52
1661172351.1192095,-101.53
1661172361.1116898,-101.69
1661172371.1051054,-101.52
1661172381.0819757,-101.54
1661172391.0858734,-101.71




🐍 To double-check your Logfile ...




# -*- coding: utf-8 -*-
"""
Created on Thu Aug 25 20:21:27 2022

Simple Sketch to Load Data from a file and draw a graph

@author: Changpuak
"""

import matplotlib.pyplot as plt

FILENAME = 'DATA-2022-08-22-001.txt'
HEADERLINES = 4
LINECOUNTER = 0

X = []
Y = []

f = open(FILENAME, 'r', encoding='utf-8') 
try:    
    # READ THE HEADERLINES
    while LINECOUNTER < HEADERLINES:
        LINE = f.readline()
        LINECOUNTER += 1
        
    # PROCESS THE DATA    
    while True:
        LINE = f.readline().splitlines()      # REMOVE THE "\n"
        if LINE:
            DATA = LINE[0].split(",")
            # X.append(int(float(DATA[0])))   # MICROSECONDS NOT USED
            X.append(LINECOUNTER-HEADERLINES)
            Y.append(float(DATA[1]))
            LINECOUNTER += 1
        else:
            break
 
finally:    
    f.close()
    # PLOT THAT THING
    plt.style.use('bmh')
    fig, ax = plt.subplots(1,1)    
    ax.plot(X, Y, linewidth=1.0, color='#0000FF')
    plt.show()
    




Plot of Data

The Datafile ... visualized. A picture says more than 999 words.




✈ Share your thoughts



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t1 = 6586 d

t2 = 179 ms

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