>For example if R1=10k
>and R2=100 then the output voltage will be 50mV which should be low enough
>to trigger the interrupt.

It better!  The logic low for I/O pins is generally around 0.8-1.2 V.  To be
safe, I would say anything <500 mV will generate a logic LOW on a pin.  Just
noting this to give you an idea of how close you need to cut it (or how
close you don't need to, rather).

--Andrew

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