def normalize(adc_reading, adc_max=4095):
    """Normalize (percentage)

    ADC reads a value in the range [0,4095] across 
    voltage range [0.0v,1.0v].

    Args:
        adc_reading: value read from ADC pin
        adc_max: maximum value allowed by ADC

    Returns:
        A normalized (percentage) value of ADC
    """
    return (100 * adc_reading) / adc_max