def is_face_down(index=1):
    acc_z = get_acceleration('z', index)
    if (acc_z > FACE_STATUC_THRESHOLD):
        return True
    else:
        return False
def is_face_down(index=1):
    acc_z = get_acceleration('z', index)
    if (acc_z > FACE_STATUC_THRESHOLD):
        return True
    else:
        return False