> Yes. I am thinking about a way to make sure that there won't be
> a 1 for a 0 and vv

Modulating the light source (PWM module or separate oscillator)
would help, with a band-pass filter on the sensor output. I tried one
of those reflective IR sensors once as a "touch" button, worked OK
but went with something else in the end

Like this (238kB)

http://www.optekinc.com/pdf/OPB740.pdf

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