cny70 and schmitt trigger

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Hello,
i would like to use a cny70 in combination with a duemilanove arduino to read a gasmeter in my house.
I did some testing but got a poor signal change, now i am thinking that, in order to get a 1 or 0 signal, using a schmitt trigger could do the job.

I am a electronic newbie, so could somebody show me a simple scheme, on breadboard, how i should connect the cny70, schmitt trigger and arduino and what resistor values i would neet.

thanks