Re: Ultrasonic sensor interactions

In lugnet.robotics, Philippe Hurbain wrote:

> My interpretation (to be confimed) is that the US sensor
> goes on working even if not configured, but some sensor
> modes don't provide the 9V supply that powers US transducers.

   I'm not sure yet; I admit to not being even remotely a "hardware guy", which
is why I keep doing all this SW testing :-).

> Strangely enough, using the touch sensor as alternate sensor,
> the ping is not diminished, implying that 9V is present in
> that mode...

   Another odd feature is that the ping frequency seems to change with both what
you define the sensor as well as range (when defined as an US sensor at least)
and during start-up. All I can say for sure is that there's a lot of interesting
things going on "behind the curtain" in this sensor.

>>> At low level sample rate can be changed
>>
>> Have you been able to verify this?
>
> Yes, that's theoretical, I have yet to do detailed
> testing. Perhaps John Barnes already did that?

   Maybe (John?). But to be honest he's already done an amazing amount of work
on NBC, and only a few of us even have access to two NXT US sensors at this
point. I'm not sure anybody has tested it yet. Anybody?

-- 
Brian Davis