Is it as simple as it seems....4-20mA current loops....put across a precision resistor and then feed to the A/D ? Or better....buffered thru a unity gain amp...? Or is it a little more tricky than that? --------------------------------- Start your day with Yahoo! - make it your home page -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist