import RPi.GPIO as GPIO
import time
import sys
import tkinter as tk

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM) 

# SERVO
servoOut = 18
GPIO.setup(servoOut, GPIO.OUT)

# PWM
servo = GPIO.PWM(servoOut, 50)     #GPIO.PWM set
servo.start(0)                     #duty 0-100%

# GUI
root = tk.Tk()
root.geometry('400x200')
root.title('サーボモーター・テスト')
val = tk.IntVar()
val.set(0)
label = tk.Label(root, text='角度 = %d' % val.get())
label.place(x=175, y=120)

# angle to duty convert
def servo_angle(angle):
    duty = round(2.5 + (12.0 - 2.5) * (angle + 90) / 180, 1)
#    print(duty)
    servo.ChangeDutyCycle(duty)
    time.sleep(0.3)

# slider change
def sbar(scl):
    angleData = int(90 / 50 * int(scl) - 90)
#    print(angleData)
    label.config(text='角度 = %d' % int(angleData))
    servo_angle(angleData)

sld = tk.Scale(root, label='  スライダー', orient='h', from_=0, to=100, showvalue=False, variable=val, command=sbar)
sld.place(x=150, y=50)
sbar(0)
root.mainloop()

servo.stop()
GPIO.cleanup()
sys.exit()