[mdlug] Raspberry Pinewood Derby

[Mat Enders]

you could hook the pi up to a holding physical switches on a teeter along
with something on the start line and capture all of the times


On Mon, Mar 3, 2014 at 10:30 AM, Ingles, Raymond <
Raymond.Ingles at compuware.com> wrote:

> Used my Raspberry Pi at my sons' Cub Scout Pinewood Derby yesterday. It
> was a quick hack set up with about two hours of experimentation, but it
> worked.
>
> I hooked up a Playstation Eye (the PS3 version of the EyeToy) to the Pi
> and used it to record the finish line. The Eye is capable of 120fps at
> 320x240 resolution (125fps by some reports), but the best I could reliably
> get out of the Pi was 75fps. And to do that, I had to eliminate any and all
> recoding; I was just dumping the raw video directly to a file via ffmpeg.
> In my experiments, I never saw the Pi pull down more than 90fps at a burst.
>
> The Pi couldn't even play that 75fps video back at full speed; it pegged
> the CPU at around 30-40fps. (I imagine if I'd recoded it, it would have
> done better. It was YUV422 video, and had to be software-converted to RGB
> to play.)
>
> Anyway, I set it up to play at 15fps - which only hit maybe 50% of the CPU
> - then paused and went frame-by-frame when the cars appeared on the screen.
> They were a tad blurry, but there was only one race out of several dozen
> that was too close to call and had to be re-run. Next year I want to set up
> at least a sensor to trigger the start of recording. And I'll see if I can
> do enough vision processing to pick out the frame where the cars cross the
> finish line.
>
> All the scripts and such are home, but I'll see if I can extract and post
> them here. Not a bad hack for stuff I had just laying around.
>
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-- 
Mathew E. Enders

"Where once Samba and Apache sold Linux to the world they are now just part
of the plumbing.  But that's OK, plumbers make good money."
--Jeremy Allison