> 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?
Well, this is why you probably want a sonar sensor that allows you to
trigger it to take a reading. That way you can hold-off the other
sensor (they seem to have about a 60ms cycle time) until you have
completed a reading from the first sensor. Those that do their own
timing can be confused by pulses from the others sensors.
You might want to try the Devantech SRF-05. You gate that and then
watch the pulse width of the returning pulse.
--
Brian Lloyd Granite Bay Montessori
brian AT gbmontessori DOT com 9330 Sierra College Blvd.
+1.916.367.2131 (voice) Roseville, CA 95661, USA
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
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