Hello. I think I know the answer but, given my newbiness, it's better I double check: regard the analog to digital converter, page 270 of the 18F4550 datasheet says: "The maximum recommended impedance for analog sources is 2.5 KOhm". Does it mean using a 10K potentiometer is not advisable? Thanks Cristiano --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .