> > When you say 'modulate the IR LED for 20 seconds': if you use
> > standard IR receivers you must insert gaps in the tranmission,
> > otherwise you will saturate the receivers
> 
> The common IS1U60 doesn't suffer from that IME. I use them in
> door minders with unbroken (except by legs and people looking
> for contact lenses) 38kHz IR beams
> 

The datasheet is not very clear about this, but is does state a maximum
'high' time (800us) and a minimum 'low' time (400us). But the block
circuit does not show an AVR feedback like the TSOP's, so maybe it is
indeed different in this respect. Or just a sloppy datasheet...

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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