Arduino using RPR-220

Looking for a program which uses a IR transmitter and optical sensor for detecting the present of an object. A program which accomplishes this exist, saw it once can not locate again. The IR emitter transmits a pulse train. The optical sensor output is averaged to determine the ambient light level. The program then looks for a señor level above the ambient light level.

Thanks for any help in finding this program.

Apparently you haven't heard of Google.

Thanks for the info. I've seen that program, not the one I'm looking to find, again.

I've searched my History, but can not recover the interesting article.