Re: Ideas for light sensor trigger/switch?

From: Lord Garth (LGarth_at_Tantalus.net)
Date: 02/15/05 

Date: Tue, 15 Feb 2005 02:18:03 GMT

"nospam" <nospam@nospam.invalid> wrote in message
news:n5p111hed91qq1clddeb4jg0tupphl4tlg@4ax.com...
> Andy Turner <andyt@nospam.demon.co.uk> wrote:
>
> >The trickiest bit, I'd
> >imagine, would be to get a system where the sensors aren't affected by
> >light from the adjacent bulbs - the lights would have to shine
> >*directly* down into the sensors and not spread at all. Or is visible
> >light not the way to go - should I use infra-red of some sort?
>
> Multiplex LED emitters and synchronously detect with the receivers.
>
> That eliminates crosstalk between the 'strings' and the synchronous
> detection can be arranged to more or less ignore ambient light.

That would prevent two or more "strings" from triggering the MIDI
synth simultaneously.

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