from machine import Pin, ADC, PWM
from utime import sleep, sleep_ms


servo= PWM(Pin(18), freq = 50)

def map_servo(x):        
        return int((x - 0) * (125 - 25) / (180 - 0) + 25) 

while True:
    m = map_servo(0)
    servo.duty(m)
    print(m)