from time import sleep
sleep(0.1) # Wait for USB to become ready
from machine import Pin,PWM

outPin = 16
analogOUT = PWM(Pin(outPin))
analogOUT.freq(1000)
analogOUT.duty_u16(0)
while True:
    myVoltage = float(input('What output voltage do you want ? '))
    pmVal = (65535/3.3)*myVoltage
    print(pmVal)
    analogOUT.duty_u16(int(pmVal))