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I have been looking for a cheap ultrasonic sensor that is not blind under +/-30 cm but the only sensors I could find use the following shape, which is not suitable for my project (because of the robot design that only has 1 hole, and not 2..) : shape 1

Is there any chance to find a sensor with that other shape with a range starting around 5cm ?

shape 2

Actually I am wondering if that 2nd shape makes this constraint mandatory or if I just did not found the appropriate product.

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closed as primarily opinion-based by holmeski, Mark Booth Apr 6 '16 at 20:00

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Shopping questions are not allowed on the robotics stackexchange. robotics.stackexchange.com/help/on-topic $\endgroup$ – holmeski Apr 5 '16 at 23:28
  • $\begingroup$ For shorter ranges you could consider an infrared proximity sensor. $\endgroup$ – Biscuits Apr 6 '16 at 5:50
  • $\begingroup$ @holmeski It's not a shopping question, my point since the begining was to get an answer that gives an explanation to that finding, and that's exactly what hauptmech did. If that wasn't clear enough, feel free to edit my question as I can't do more as english is not my main language. $\endgroup$ – LiohAu Apr 10 '16 at 21:34
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A single transducer sensor has to both send out the sound and then sense the return sound. It takes time for the vibration to stop after making the sound and that is time it can't sense a return. So close distances can't be sensed by a single transducer sensor.

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