Reading temperature from Arduino

Read_Arduino_Sensor_Data.py

# Based on code by Paul McWhorter:
# http://www.toptechboy.com/tutorial/python-with-arduino-lesson-11-plotting-and-graphing-live-data-from-arduino-with-matplotlib/

import serial 
import re 
import csv 
import numpy as np 
import matplotlib.pyplot as plt 
from drawnow import *

# Set path to my Arduino device
portPath = "/dev/tty.usbmodemfa411"
baud = 9600 
sample_time = 0.1
sim_time = 10

# Initializing Lists 
# Data Collection 
data_log = [] 
line_data = [] 

# 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 

plt.ion() #Tell matplotlib you want interactive mode to plot live data

# Create a function that makes our desired plot
def makeFig():
    plt.ylim(15,35) 
    plt.title('Temperatur Sensor Data') 
    plt.grid(True)
    plt.ylabel('Temperatur C')
    plt.plot(data_log, 'ro-', label='Degrees C')  
   
# Collecting the data from the serial port 
while True: 
    line = connection.readline()
    line_data = re.findall('\d*\.\d*',str(line))
    line_data = filter(None,line_data)
    line_data = [float(x) for x in line_data]
    if len(line_data) > 0:
        print(line_data[0])
        if float(line_data[0]) > 0.0:
            drawnow(makeFig)
            plt.pause(.000001) 
            data_log.append(line_data) 
    if len(data_log) > max_length - 1: 
        break 
    
# Storing data_log in data.csv 
with open('data.csv','w', newline='') as csvfile:
    for line in data_log:
        csvwrite = csv.writer(csvfile)
        csvwrite.writerow(line)
        

Setup_Temperatur_Sensor_Arduino.pde

//TMP36 Pin Variables
int sensorPin = 0; //the analog pin the TMP36's Vout (sense) pin is connected to
                   //the resolution is 10 mV / degree centigrade with a
                   //500 mV offset to allow for negative temperatures
void setup()
{
  Serial.begin(9600);  //Start the serial connection with the computer
                       //to view the result open the serial monitor 
}
 
void loop()           // run over and over again
{
 //getting the voltage reading from the temperature sensor
 int reading = analogRead(sensorPin);  
 
 // converting that reading to voltage, for 3.3v arduino use 3.3
 float voltage = reading * 5.0;
 voltage /= 1024.0; 
 
 // now print out the temperature
 float temperatureC = (voltage - 0.5) * 100 ;  //converting from 10 mv per degree wit 500 mV offset
                                               //to degrees ((voltage - 500mV) times 100)
 Serial.println(temperatureC);                 //Serial.println(" degrees C");

  delay(100);
}