from machine import Pin,PWM
from time import sleep

push=Pin(25,Pin.IN,Pin.PULL_DOWN)
servo=PWM(Pin(22),freq=50)

v=25
while(1):
    if push.value()==0:
        servo.duty(v)
        sleep(2)
        v=v+2
        if v>125:
            v=25
    
    else:
        servo.duty(v)
        sleep(0.5)
        v=v-3
        if v<25:
            v=125