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

frequency  = 5000
led = PWM(Pin(23), frequency)

adc = ADC(Pin(34))
adc.atten(ADC.ATTN_11DB)

while True:
    value = int(adc.read()*0.25)
    led.duty(value)
    duty = ((value*100)/1023)
    print('value = ', value)
    print('duty cycle = ', duty,'%')
    sleep(0.08)