I've written a script to log data from my Arduino to a csv file. The script
works well enough but it's very, very slow. I'm quite new to Python and I just
wanted to put this out there to see if any Python experts could help optimise
my code. Here it is:
import serial
import re
import csv
import numpy as np
import matplotlib.pyplot as plt
portPath = "/dev/ttyACM0"
baud = 9600
sample_time = 0.5
sim_time = 30
# Initializing Lists
# Data Collection
data_log = []
line_data = []
def map(x, in_min, in_max, out_min, out_max):
return (((x - in_min) * (out_max - out_min))/(in_max - in_min)) +
out_min
# Establishing Serial Connection
connection = serial.Serial(portPath,baud)
# Calculating the length of data to collect based on the
# sample time and simulation time (set by user)
max_length = sim_time/sample_time
# Collecting the data from the serial port
while True:
data_log.append(connection.readline())
if len(data_log) > max_length - 1:
break
# Cleaning the data_log and storing it in data.csv
with open('data.csv','wb') as csvfile:
for line in data_log:
line_data = re.findall('\d*\.\d*',line) # Find all digits
line_data = filter(None,line_data) # Filter out empty strings
line_data = [float(x) for x in line_data] # Convert Strings to float
for i in range(1,len(line_data)):
line_data[i]=map(line_data[i],0,1023,0,5)
csvwrite = csv.writer(csvfile)
csvwrite.writerow(line_data)
plt.clf()
plt.close()
plt.plotfile('data.csv',(0,1,2),names=['time (s)','voltage2 (V)','voltage1
(V)'],newfig=True)
plt.show()
I'd appreciate any help/tips you can offer.
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