Alt-BEAM Archive
Message #02871
To: Bob Shannon bshannon@tiac.net
From: Steven Bolt sbolt@xs4all.nl
Date: Sat, 1 May 1999 16:13:08 +0200 (CEST)
Subject: [alt-beam] Re: Easter egg hunt suggestions
On Sat, 1 May 1999, Bob Shannon wrote:
> Chiu-Yuan Fang wrote:
> > My only suggestion:
> > Use an IR output of 40kHz so that Sharp GP1U58X modules (easy
> > to finy) or Sharp IS1U60 modules (very small) can be used.
> > That would make things a whole lot easier.
>
> Sharp IS1U60's don't operate correctly at 3.3 volts, and so are not very
> solar-firendly.
> There is a 3 volt IR module, I've got that PDF file here somewhere....
>
> Also the IS1U60's are much more sensitive than the GP1U56X series
> as well as being much smaller and lighter. I highly reccomend
> the IS1U60's, but only if you can afford to give it a very clean
> 5 volt power supply.
Exactly my problem with those modules; the stabilized 5V
requirement. But the Egg Hunt allows any IR beacon now. Only the
average power is limited:
Modulated IR beacon: Circuits for several modulation frequencies to
be supplied. Possibly something like this, with a few extra
emitters to guarantee reception in a 90 degree arc.
Height: 3cm, so the light is not blocked by the obstacles. Always
at the center of the gathering arc.
Participants may provide their own IR beacons, as long as the average
current consumption does not exceed 10mA at 5V, and the emitters are
at a height of 3cm. A stabilized 5V source will be available.
Further details on:
http://www.xs4all.nl/~sbolt/Other/e-EasterEggHunt.html
Best,
Steve
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# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
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