import time 
import machine 
p4 = machine.Pin(4) 
servo = machine.PWM(p4,freq=50) # duty for servo is between 40 - 115 
while True: 
  servo.duty(30) # tourner le servomoteur à 30° 
  time.sleep(2) # attendre 2s 
  servo.duty(130) # tourner le servomoteur à 180° 
  time.sleep(2)