Is it possible that the ultra sensor only be code 80 cm using arduino? We're planning to create a smart sunglasses for blind person that can detect obstacle
What does that mean?
Which ultrasonic sensor?
What do you want to do with it?
Which Arduino?
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In general, the range ranges from 3 cm up to 400 cm depending on the model
Also depends on the target. A hard surface perpendicular to the sensor will be more easily sensed. A cloth curtain or fluffy kitten, not so much.
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…to answer your basic question based on what you’ve written, yes - simply ignore any returns greater than 80cm.
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