On 25 May 2011 18:45, Dave <[email protected]> wrote: > How would that SSI to quadrature encoder work? The nice thing about > SSI is that when the power goes on, the motion system knows exactly > where it is without homing or moving.
The way my Arduino-based resolver-to-quadrature converter works is that when you turn it on, it immediately counts up to the current position at the fastest rate it can. As long as the quadrature counter powers up before the converter, and both before the motion controllers, then you retain the absolute position advantage. In fact, it is probably fairly easy to use an Arduino for SSI. <google> Yes, there is code here. http://reprap.org/wiki/Magnetic_Rotary_Encoder_1.0 It does it with bit-bashing, and I suspect there are better ways, but it is a cheap solution. -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
