[sdiy] Has anyone seen (or played with smthing like) this ?

[Loscha]

with regard to Ambient Lighting, the version I saw working at
Melbourne Dorkbot was used in a situation first with, then without
ambient lighting. The raw sensor data was displayed on the screen (it
was about a 64 LED grid, but not 8x8) and the data was all over the
shop. Lots of random spikes and misreads.
 The trick in the coding was the smoothing out of the controller data
to make it into a musically useful form. This often involved removing
the majority of the precision, and just delivering a 7 bit value (ie:
suitable for MIDI CCs and such).

-Loscha

On 6/25/07, Richard Wentk <richard at skydancer.com> wrote:
>
> On 24 Jun 2007, at 21:23, Mike wrote:
>
> >>>> But here they use the LEDs themselves as sensors in Phode diode
> >>>> mode ?
> >>>
> >>> Yep, and the thing is no use with any ambient light...
> >>
> >> Wouldn't it be easy to put together a negative version, where it
> >> sensed lack of ambient light from whichever diodes were covered?
> >>
> > How about feeding the illuminated LED's from a PRBS source, and
> > correlating
> > to remove the ambient? I've made this approach work for acoustic
> > radar.
>
> That's a good solution too.
>
> I don't see big fingers as an issue. You can deal with that by
> including some fairly simple averaging software across multiple LEDs.
> Assume X-Y independence to reduce it to a single dimensional problem
> on each axis and add some interpolation to stop sudden jumps -
> something you'll need anyway - and there's not much else needed.
>
> Richard
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