One possibility for increasing the count resolution is to step up the shaft rate with a couple of gears driving an emitter. IBM has used this extensively in their big iron printers. I always read the saw blade ads and count the teeth hoping to find a usable number greater than 60. John Ferrell 6241 Phillippi Rd Julian NC 27283 Phone: (336)685-9606 Dixie Competition Products NSRCA 479 AMA 4190 W8CCW "My Competition is Not My Enemy" ----- Original Message ----- From: "Alan Gorham" To: Sent: Saturday, October 26, 2002 9:01 AM Subject: Re: [PIC]: Counting shaft revolutions > You could look at the optical disks and counting modules made by US digital. > They are available for many different shaft diameters and with a range of > count resolutions. > > www.usdigital.com > > > Alan > > > > >Hello to all, > > > >I'm interested in a device that can be used to count revolutions of a slow > >turning shaft, 10 turns/minute, with 1 or 2 degree resolution. I will then > >use a Pic to read and limit the number of turns and fractional parts of a > >turn. Good resolution is important. Any ideas appreciated. > > > > Rod > > > >-- > >http://www.piclist.com hint: The PICList is archived three different > >ways. See http://www.piclist.com/#archives for details. > > > > > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.