they can be set to trigger sequentially to hopefully remove the
multi-path reflection problem that you appear to be seeing. Another way
is to simply only allow them to trigger after a meaningful signal has
been received from previous ones. SONAR use if fraught with this type
of problem. For close ranges indoors (or not in full daylight) I like
to use the Sharp IR sensors. They have some problems with oblique angle
deflection errors, but not multi-path. Or, and this is probably the
best answer, use both and compare values to come to an agreement upon
what is being sensed.
I saw mention of the Devantech SONARs, these are good items that allow
multiple reflections to be seen and recorded - But then you have to
figure out what the data means! Sensor interpretation is _very_tricky.
DLC
jon_mark_go wrote:
> I think I may have figured it out (though I haven't tested this).
> Could the sonar sensor pulses be bouncing off the walls and being
> received by different sensors which drives up the value? If so, can
> anyone suggest a type of distance sensor that would allow me to have
> two facing opposite directions without any bouncing pulses?
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
>
>
--
------------------------------------------------------
Dennis Clark ooPIC Tech Support
www.oopic.com
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