Park distance control with acustic signalling

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hello there,

for school project want build park distance control set, found 1 of arduinpo, has light signalling.
is there 1 acustic signalling , how have programmed differently?
i not asking comp0lete program, desparately searching hints set may right, how diy pdc program may principally modified

looking forward answers , ... thanks

in place of led, put buzzer.


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