This seems to be taking on a life of its own! 5 degrees is accurate enough for my needs. If I damage the sensor pot I am not sure I can repair or replace it. I have tried the capacitor but I am using a development board that does not make getting a cap directly on the AD pin easy. John Ferrell W8CCW "All that is necessary for the triumph of evil is for good men to do nothing." -- Edmund Burke http://DixieNC.US ----- Original Message ----- From: "Jinx" To: "Microcontroller discussion list - Public." Sent: Wednesday, May 07, 2008 7:03 PM Subject: Re: [PIC]Analog signal conditioning > >Yes. If that 512 mv was stable my rotation measurement would >> be simple > > If the pot can have Vcc (I haven't met a pot that couldn't take > 50mW), that would reduce the impedance and possibly make > the noise disappear. Even something as simple as a capacitor > on the ADC input may help > > Also improve resolution too, if that matters. Currently you'd be > looking at about 1mV/degree over 450 degrees travel at the > pot wiper > > With 5000mV reference, unamplified 521mV would mean about > 5 degree resolution (ie 5000/1024 = 5mV per ADC bit) > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist