import time
import board
import analogio

vr = analogio.AnalogIn(board.GP26)   

def get_voltage(raw):
    return (raw * 3.3) / 65536

while True:
    # Reading value from analog input
    val = vr.value
    volts = get_voltage(val)
    
    print("Volts = {:.2f} raw = {:5d}".format(volts,val))
    time.sleep(1)