Depends very much on the knob used. With a 30mm knob it is 2.2mm which, whilst small, doesn't need brain surgeon dexterity. A simple vernier slow motion would alow 1 part in a 100 with ease. And a ten turn pot with a counting dial, such as we used to use on analogue computers has tenbit precision. On 13 September 2015 at 23:08, Denny Esterline wrote= : > > > > Thanks. I am only looking for 5 bit accuracy. > > > > > That might be asking a bit much - not from the PIC, that's easy enough - > from the person. > 5 bits =3D 32 position values. Typical pot has about 270 degrees of trave= l. > 270 / 32 =3D ~8.4 degrees. > > Very much depends on the scenario. Some scenarios the exact value isn't a= s > important > as "a little bit" more or less, this would likely be fine. Any situation > where you have > some type of feedback to the user (LCD?, serial?) and they can see the > actual value > would likely be fine. > > I would also recommend a small cap between the analog and gnd. Most likel= y > you > wouldn't need it on the bench... The real world is not the bench. :-) > > -Denny > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .