from machine import Pin
from machine import ADC
from machine import PWM
from time import sleep_ms


servo = PWM(Pin(6,mode=Pin.OUT), freq=50) 
adc=ADC(Pin(1))
adc.atten(ADC.ATTN_11DB)
while True:
    val1=adc.read() 
    pwm=51/4095*val1+51    
    servo.duty(int(pwm))    
    sleep_ms(100)