>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 04 January 2006 15:38
>To: 'Microcontroller discussion list - Public.'
>Subject: [EE]: stupid mistakes
>
>
>A closer look revealed that the IR LED was wired backwards, so 
>it was not doing anything. The RED led seems to emit enough IR 
>to make communication at a very short distance possible.

I'm nit-picking, but I suspect it is more likely that the receiver was sensitive enough at the red LED's wavelength.  LEDs tend to have a pretty narrow band output, whereas photodiodes have a much broader optical bandwidth which is why IR filters are used on the receivers.

Regards

Mike

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