当超声波模块与障碍物之间的距离超过设置的上限值或者下限值时，蜂鸣器发出报警。
When the ultrasonic distance between the module and the obstacle exceeds the upper limit or lower limit, the buzzer alarm.
当超声波模块与障碍物之间的距离超过设置的上限值或者下限值时，蜂鸣器发出报警。
When the ultrasonic distance between the module and the obstacle exceeds the upper limit or lower limit, the buzzer alarm.
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