have time to think it over. After further testing with the SRF08, I am
actually getting better readings than I thought, in that an average of ten
readings gives a reliable return plus or minus only a couple cm, and the
average turns out to have a surprisingly tight variance most of the time,
with occasional lapses. There's quite a bit of information in the average
reading, and the variance seems non-random, so there is probably useful
information there. However, I have much more testing to do to figure out
what can be gleaned from this signal. It certainly isn't what I thought was
there, but exactly what I am seeing is not so clear.
Shaggy wrote:
>
> I have been working under the assumption that the SRF08 ultrasonic range
> sensor was somewhat reliable at distances over 1 meter as a binary pair.
> After testing two pairs extensively, the readings bounce around so badly
> that depth perception cannot be calculated using them, though some rough
> distances are possible after averaging for several repetitions. The
> sensors seem pretty accurate at ranges under about 50cm, but not so much
> beyond that.
>
> Therefore, I am looking at my options.
>
> Before you toss out sonar, you should consider the MaxSonar sensor line.
>
> Each of our sensors is tested with a swinging pendulum, a pole at four
> feet, and another at eight feet. All of the sensors must meet our
> performance criteria (all readings must be correct!) or they do not ship.
> Real world tests for real world uses. We also show some data on the
> performance data section of our web page showing our sensors in comparison
> to others (scroll down the page).
> http://www.maxbotix.com/Performance_Data.html
>
> We believe that we shine in the following areas; reading stability; use
> with moving objects; noise rejection; clutter rejection; and beam control.
> We have five different models and sell a sampler pack with five sensors,
> (one of each beam width), for about the same or less than you (likely)
> paid for your two SRF08 sensors.
>
> In addition, if in your specific application you have reading instability,
> we have worked with our customers to find out the exact cause for this
> Sometimes it is another ultrasonic noise source in the area, or running
> two sensors at the same time, (just for example).
>
> Just thought you would like to know.
>
> Bob Gross
> CEO MaxBotix Inc.
> www.maxbotix.com
>
>
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