OOPIC Forum

This Forum is Dedicated For all The Object Oriented PIC Lovers .......... The concept behind OOPic is straight forward. Use preprogrammed multitasking Objects from a library of highly optimized Objects to do all the work of interacting with the hardware. Then write small scripts in Basic, C, or Java syntax styles to control the Objects. During operation, the Objects run continuously and simultaneously in the background while the scripts run in the foreground telling the objects what to do.

Sunday, March 9, 2008

Re: [oopic] New range finder needed

I've found that the Sharp IR range finders are quite repeatable as long
as your environment doesn't reflect the beams around (soda cans or
wedges). SONAR works to find "things" somewhere near, but the actual
ranges are often hard to get, especially when you are moving. Another
bad thing about SONAR is its tendency to reflect sharply on corners and
edges which can give you bad readings. In terms of your setup make sure
that you are only triggering one SONAR at a time or you will get echoes
not intended for each device. There is of course also the problem of
multi-path echoes. Yes, SONAR can be difficult to rely upon.

DLC

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. One option is to switch to a camera
> (like the CMUCam) and do a whole bunch of visual processing. The other
> option is a far more accurate range finder such as a laser, perhaps on a
> panning servo. However, after a brief search of the net, it appears that a
> suitable laser would be over $1000. Are there any other options out there?
>

--
------------------------------------------------------
Dennis Clark ooPIC Tech Support
www.oopic.com
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