> I need to detect a certain frequency which is very strait forward (
> using a PLL) but at the same time measure the amplitude of that
> frequency. basic what I want to achieve is detect the object
> transmitting and By the amplitude of the frequency transmitted see if
> it is at a certain distance from the receiver.
> those anyone as any thoughts?

Note that the received light level is highly depending
on the angle of both the IR-LED and the receiver.
Are these hand held devices ?
And I'd expect the level to be dependent on the
coulor of the walls and so on.

The only "distance" you can probably measure, is
that the sender is close enugh to be "seen"
by the receiver...

But I might have misunderstod something, I'm not realy sure
what the "amplitude of the frequency transmitted" is.
I read it as "amplitude of the signal received", is that
right ?

Jan-Erik.

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