CODEWITHSUNDEEP
pythonarduino
user1491466
user1491466

Reputation: 31

Continuous data streaming Arduino to Python

I am trying to get a Python GUI window using Tkinter to continuously display data streaming from an Arduino Uno board acting as a voltmeter. With the code I've got, the window will display one data point, and once the window gets closed, a new window opens up with the next available data point. Here's the code I've been using:

import serial
from Tkinter import *
ser = serial.Serial('/dev/tty.usbmodem621')
ser.baudrate = 9600
while 1 == 1:
    reading = ser.readline()
    root = Tk()
    w = Label(root, text = reading)
    w.pack()
    root.mainloop()

I'm using a MacBook Pro, and the pySerial package for my serial communications. How do I get the window to refresh itself?

Upvotes: 3

Views: 2979

Answers (1)

bradleyjkemp
bradleyjkemp

Reputation: 276

I think the problem is that you're creating a new root for every loop iteration. Try this code:

import serial
from Tkinter import *
from time import sleep
ser = serial.Serial('/dev/tty.usbmodem621')
ser.baudrate = 9600

def update():
    while 1:
        reading.set(ser.readline())
        root.update()
        sleep(1)

root=Tk()
reading = StringVar()

w = Label(root, textvariable = reading)
w.pack()

root.after(1,update)    
root.mainloop()

This sets up the "mainloop" to call the "update" function after a millisecond and uses a reference to the variable "reading" rather that the actual value of it, allowing it to be updated.

I hope this helps.

Upvotes: 2

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