On Mon, 2009-03-09 at 15:46 -0400, Jim Combs wrote: > > I was going to drill holes into a disk with a binary bit pattern and > > clock bit. It's not very elegant and larger than I like. Does anyone > > know of an existing (inexpensive) absolute encoder that would work? > > Why not just drill a single set of holes and use two offset opto isolators > to get a quadrature output. (Or buy one). then feed that to an up down > counter. > > One signal of the quad encoder is UP/DOWN the other one becomes the CLOCK > for the counter. Gray code not needed if you do that > > Initializing the counter can be done with an index hole or with software. > > Jim C
A quadrature encoder would be easier to make, but I want to avoid having to initialize the carousel at power up. It's not a big deal to run the tools through a cycle to find the index tool position, but I am more comfortable with an absolute encoder because it will tell me the tool position even if the software gets confused. Kirk ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
