def receive_arduino_simple(serial_connection, min_length=1):
    """
    Returns a message received over *serial_connection*

    Same as :code:`receive_arduino` but doesn't expect that the message starts
    with a hex number.

    Parameters
    ----------
    serial_connection : object
        the :code:`serial.Serial` object you want to use for receiving
    min_length : int, optional
        if you only want that the function to only return the string if it is
        at least this long.

    Returns
    -------
    msg : str or None
        the message received or None
    """
    if serial_connection.inWaiting():
        msg = serial_connection.readline().decode().rstrip()
        if len(msg) >= min_length:
            return msg
        else:
            return None
