control rail accident by using ultrasonics and sensors

we know that properties of ultrasonics.Because of its properties it return back when it strikes on any object.ultrasonics are produced by piezo effect.the principle based on obstruction found by ship using sensor.with the help of sensor we detect the exit means it create an alarm ,which means that ultrasonics change to warn the rail driver by creating alarm.we use programmable logic controller in which we create program to execute such operation.

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