arduino python matplotlib line

1import serial # import Serial Library
2import numpy  # Import numpy
3import matplotlib.pyplot as plt #import matplotlib library
4from drawnow import *
5 
6tempF= []
7pressure=[]
8arduinoData = serial.Serial('com11', 115200) #Creating our serial object named arduinoData
9plt.ion() #Tell matplotlib you want interactive mode to plot live data
10cnt=0
11 
12def makeFig(): #Create a function that makes our desired plot
13    plt.ylim(80,90)                                 #Set y min and max values
14    plt.title('My Live Streaming Sensor Data')      #Plot the title
15    plt.grid(True)                                  #Turn the grid on
16    plt.ylabel('Temp F')                            #Set ylabels
17    plt.plot(tempF, 'ro-', label='Degrees F')       #plot the temperature
18    plt.legend(loc='upper left')                    #plot the legend
19    plt2=plt.twinx()                                #Create a second y axis
20    plt.ylim(93450,93525)                           #Set limits of second y axis- adjust to readings you are getting
21    plt2.plot(pressure, 'b^-', label='Pressure (Pa)') #plot pressure data
22    plt2.set_ylabel('Pressrue (Pa)')                    #label second y axis
23    plt2.ticklabel_format(useOffset=False)           #Force matplotlib to NOT autoscale y axis
24    plt2.legend(loc='upper right')                  #plot the legend
25    
26 
27while True: # While loop that loops forever
28    while (arduinoData.inWaiting()==0): #Wait here until there is data
29        pass #do nothing
30    arduinoString = arduinoData.readline() #read the line of text from the serial port
31    dataArray = arduinoString.split(',')   #Split it into an array called dataArray
32    temp = float( dataArray[0])            #Convert first element to floating number and put in temp
33    P =    float( dataArray[1])            #Convert second element to floating number and put in P
34    tempF.append(temp)                     #Build our tempF array by appending temp readings
35    pressure.append(P)                     #Building our pressure array by appending P readings
36    drawnow(makeFig)                       #Call drawnow to update our live graph
37    plt.pause(.000001)                     #Pause Briefly. Important to keep drawnow from crashing
38    cnt=cnt+1
39    if(cnt>50):                            #If you have 50 or more points, delete the first one from the array
40        tempF.pop(0)                       #This allows us to just see the last 50 data points
41        pressure.pop(0)
42

1import serial # import Serial Library
2import numpy  # Import numpy
3import matplotlib.pyplot as plt #import matplotlib library
4from drawnow import *
5 
6tempF= []
7pressure=[]
8arduinoData = serial.Serial('com11', 115200) #Creating our serial object named arduinoData
9plt.ion() #Tell matplotlib you want interactive mode to plot live data
10cnt=0
11 
12def makeFig(): #Create a function that makes our desired plot
13    plt.ylim(80,90)                                 #Set y min and max values
14    plt.title('My Live Streaming Sensor Data')      #Plot the title
15    plt.grid(True)                                  #Turn the grid on
16    plt.ylabel('Temp F')                            #Set ylabels
17    plt.plot(tempF, 'ro-', label='Degrees F')       #plot the temperature
18    plt.legend(loc='upper left')                    #plot the legend
19    plt2=plt.twinx()                                #Create a second y axis
20    plt.ylim(93450,93525)                           #Set limits of second y axis- adjust to readings you are getting
21    plt2.plot(pressure, 'b^-', label='Pressure (Pa)') #plot pressure data
22    plt2.set_ylabel('Pressrue (Pa)')                    #label second y axis
23    plt2.ticklabel_format(useOffset=False)           #Force matplotlib to NOT autoscale y axis
24    plt2.legend(loc='upper right')                  #plot the legend
25    
26 
27while True: # While loop that loops forever
28    while (arduinoData.inWaiting()==0): #Wait here until there is data
29        pass #do nothing
30    arduinoString = arduinoData.readline() #read the line of text from the serial port
31    dataArray = arduinoString.split(',')   #Split it into an array called dataArray
32    temp = float( dataArray[0])            #Convert first element to floating number and put in temp
33    P =    float( dataArray[1])            #Convert second element to floating number and put in P
34    tempF.append(temp)                     #Build our tempF array by appending temp readings
35    pressure.append(P)                     #Building our pressure array by appending P readings
36    drawnow(makeFig)                       #Call drawnow to update our live graph
37    plt.pause(.000001)                     #Pause Briefly. Important to keep drawnow from crashing
38    cnt=cnt+1
39    if(cnt>50):                            #If you have 50 or more points, delete the first one from the array
40        tempF.pop(0)                       #This allows us to just see the last 50 data points
41        pressure.pop(0)
42
43