different voltaje a/d sensors

[dhouston]

Considering melanie's and dhouston, last suggestions, I think the simplest, cheapest, noise cleanest, circuit simplest and MIPS faster option is to just connect sensors directly to my MCU/PIC/CPU..

Actually, that was my first suggestion, as well.

[RodSTAR]

Actually, that was my first suggestion, as well.

Yes but originally I didn't consider it because at that time I didn't have 12-bit A/D. your OpAmps suggestion was the one I most liked until I figured a 12 bit reolution.