from tkinter import *
import serial
import time

serialInterface = serial.Serial('COM11', 9600)

root = Tk()
label = Label(root, text="Hello World")
label.pack()

def click():
    while serialInterface.in_waiting:
        print(serialInterface.readline())
        time.sleep(0.5)


button = Button(root, text = "Read", command=click)
button.pack()

root.title = 'New Title'


root.mainloop()