from machine import Pin,ADC

adc = ADC(Pin(32))
adc.atten(ADC.ATTN_11DB)
adc.width(ADC.WIDTH_12BIT)

while True:
  adc_value = adc.read()
  volt = (3.6*adc_value)/4095
  input_vol = "The input voltage is {:0.3f} volts"
  print(input_vol.format(volt),end = "\r")