from machine import Pin, ADC, PWM
from time import sleep

pwm = PWM(Pin(23),freq=50)
adc = ADC(Pin(35))
adc.width (ADC.WIDTH_9BIT)
adc.atten (ADC.ATTN_11DB)

lista = [25,50,75,100,125]

while(1):
    v=adc.read()
    if v<=102:
        pwm.duty(lista[0])

    elif v<=204:
        pwm.duty(lista[1])

    elif v<=306:
        pwm.duty(lista[2])

    elif v<=408:
        pwm.duty(lista[3])

    else:
        pwm.duty(lista[4])