Ping and oblique angles

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i'm sure not new issue.  my robot uses ping obstacles , when found, stops sweeps 180 degrees (10 segments) looking clear path.   having problem surfaces @ oblique angles ping in can't correctly determine distance.  i pretty sure have s same issue sony ir sensor, not sure.  has run solution problem?  the sensor works in every other way.

charlie

not sure have done avoid trying come here: putting vertical scan motor help?


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