Infra red or sonar proximinity sensor

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Hi,

I am assisting a a student with a project. He wants to create sort of a
proximinity sensor for the "blind". That would assist vision impaired
indiviual, who cant afford a seeing eye dog. It would be in addtion to
the specialezed walking cane.

Any idea where to begin?

 

[[email protected]]

So I should begin by crossposting? I see...