from Tkinter import *
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)
pwm = GPIO.PWM(18, 100)
pwm.start(5)
GPIO.setwarnings(False)

class App: 
	def __init__(self, master):
		frame = Frame(master)
		frame.pack()
		scale = Scale(frame, from_=0, to=180,
		orient=HORIZONTAL, command=self.update)
		scale.grid(row=0)
	

	def update(self, angle):
		duty = float(angle) / 10.0 + 2.5
		pwm.ChangeDutyCycle(duty)

root = Tk()
root.wm_title(‘Servo Control’)
app = App(root)
root.geometry(“200×50+0+0”)
root.mainloop()