> Yeah, I can't do an optical sensor because the unit would have some 
> lateral movement also and it would be hard to ensure that emitter would 
> stay within the field of view of the detector, unless I go in for a really 
> wide angled led.


My experience is that yogi get extremely high angles with IR due to 
reflection off all and sundry. Sometimes you get 180 degree off angle 
operation :-). I'd have thought that if power consumption was acceptable 
that an IR solution would be the easiest.

This is at 38 kHz and your results may vary at higher data rates.



        RM

> I guess doing it optically is out for some reason - I would have though
> over that range that a flashing (& modulated?) LED would be
> straightforward.
> You may not even need the hall sensor if you have something to reflect 
> off.

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