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'[EE]:Rolf and exceeding 20 meters of IR communicat'
2005\10\23@140558 by Gus Salavatore Calabrese

face picon face
Hi Rolf


1) Yes I have a scope for sale cheap.  If you are interested reply to me
directly at        spam_OUTscope.for.cheapTakeThisOuTspamoh-dog.com

2) Possible solution:  Use more than one IR LED stacked in series.  
Use a separate
battery set with a voltage larger than the combined drop of the  
LEDs.   If you use
5 LEDs that would be 5 Volts drop. ( Assumming your IR LEDs drop 1V  
each, which
 is hard to believe ).  Use your PIC to drive a FET transistor that  
turns on the string of LEDs.
All LEDs now share the same current and only one limiting resistor  
need be used.

3)  Using lenses is good idea.  Start with a visible LED with the  
same half power angle as your
IR LED.  Now you can experiment with lenses that will make the beam  
more directional.
( this may require a darkened room )   The receiver may benefit from  
a tube with flat black interior
that is pointed at the LED transmitter.  This will reduce  
interference from the sun and reflections.
Here are some quickie URLs I found
http://van.hep.uiuc.edu/van/qa/section/Light_and_Sound/
Lenses_and_Mirrors/20041111101841.htm
http://softlyspokenmagicspells.com/halloween/light_beam.html





Augustus Gustavius Salvatore Calabrese 720.222.1309    AGSC
http://www.omegadogs.com   Denver, CO

and now the small print:

Disclaimer: The above statements are not intended as an endorsement  
of any kind and any inference of having any verifiable knowledge  
about anything referenced above is purely coincidental. ( it is  
hoped ! )  If any statement above might get the author into trouble,  
it was not supported by the author but passed along from some mal-
content as an educational experience.  Alignment is with authority  
figures at all time; especially those with large police forces.  
PLEASE DON'T HURT ME !  I AM ON THE GROUND AND SUBMISSIVE.

If you are not part of the solution, you are precipitate.

ALL ORIGINAL COMMENTS / IDEAS / TEXT IN THIS MISSIVE ARE PUBLIC  
DOMAIN.  USE THEM AS YOU WILL.



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