[oopic] Re: OOPIC and CMUCAM

--- In oopic@yahoogroups.com, "teh_gamr" <ashraf.hammoud@...> wrote:
>
> Hello all,
>
> I'm intending to build some kind of object following robot, perhaps a
> colorful ball. Tracking with the cmucam is a piece of cake, as long as
> the lighting is right. The camera automatically rotates the servo.
>
> However, I need some way for the oopic to know where the camera is
> pointing and move the base station accordingly.
>
> I can think of 2 ways:
>
> 1) Have the camera talk directly to the oopic. From searching online,
> I couldn't find much to help me.
>
> 2) Have the oopic read the position of the servo that the camera is
> mounted on.
>
> Does anyone have an idea how to have the oopic talk to a cmucam? I
> know it's possible, I have the final report for a project that used
> an oopic with a cmucam connected serially, but there aren't any
> connection details.
> On the other hand, is there any way that I can tap into the control
> line of the servo to know where it is pointing or what angle it's been
> given?
>

I have heard rumors that it might be possible to keep up with an
abbreviated Track command but the OOPic is so slow at executing code
that I think it wouldn't leave much time for anything else

I would try to read the servo pulse width with a PAK-VII chip:
http://www.awce.com/pak7.htm

Sample code here:
http://www.awce.com/ooppic7.htm

Or, you could do something with optical encoding like a wheel with
stripes in some kind of Grey code. Mechanically, it might be
difficult but you could also try a rotary encoder (nothing but a fancy
potentiometer if you use the analog type).

I think I like the PAK-VII approach...

Richard

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