import serial
from Tkinter import *


def led_on():
     arduinoData.write(b'1')


def led_off():
     arduinoData.write(b'0')

arduinoData = serial.Serial('/dev/ttyACM0',9600)
led_control_window= Tk()

btn=Button(led_control_window,text="led on",command=led_on, height=6, width=10)
btn2=Button(led_control_window,text="led off",command=led_off, height=6, width=10)

btn.pack()
btn2.pack()