[oopic] Re: Providing a clock/time to the PIC

Hehe actually that was one of the consideration but our prof wants it
done by calculation though the light sensor provides a better
solution since when it is raining the motor would not move. Servo
Control was also one of the consideration. But oh well... the
presentation is in 2 week's time. >.< but definitely much to learn
about programming a robot. Hopefully i can do much more next time.

Minghui

--- In oopic@yahoogroups.com, Brian Lloyd <brian-wb6rqn@...> wrote:
>
>
> On Apr 1, 2008, at 4:37 AM, minghui1984 wrote:
>
> > Thanks all for the replies. More stuff learnt with every post. I
just
> > realised that oopic does not support double or float numbers? hmm
> > this is because my application deals with controlling a stepper
motor
> > to move a solar tracker, not quite the usual applications that ppl
> > use the oopic for. So i didn't realised when i ordered, how would
i
> > store a values from the calculations and calculate inverse. One
more
> > problem is i realised that only single step movement is possible
for
> > the stepper function. >.<
> >
> > Guess i have to make do, the oopic simple interfacing allows me
to do
> > the prototype that demostrates my solar tracking. Hmm perhaps i
would
> > list it as future improvement.
>
> Why not just change from open-loop (time-of-day) to closed loop
> tracking? When the sun goes down drive your tracker back to its
> easternmost position. When the sun comes up, use a pair of light
> sensors separated by a vertical baffle (parallel to the polar axis
on
> your tracker) with a light sensor on either side. If the panel is
not
> facing the sun, the baffle will shade one sensor or the other. Use
> that do drive your tracking motor one way or the other until both
> sensors see the same light level. Now you won't need to know the
time
> of day and your tracker will work just fine based on sun position.
>
> Here is a bit of a diagram. Use a fixed-width font to view:
>
>
> SSS
>
> |
> |
> |
> s | s
> -------
> P
>
>
> SSS = sun
> s = light sensor
> P = polar axis (coming out of the screen toward you)
>
>
> --
>
> Brian Lloyd Granite Bay Montessori
> brian AT gbmontessori DOT com 9330 Sierra College Blvd.
> +1.916.367.2131 (voice) Roseville, CA 95661, USA
>

http://www.gbmontessori.com
>
> 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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