On Sat, 2010-03-06 at 21:49 -0800, Kirk Wallace wrote: ... snip > It seems to work. I jury rigged a breadboard and massaged my ADC comp > into a absolute encoder comp. I get an output from 0 to 1023 as I rotate > the shaft magnet. Now, I need to machine a housing with a shaft, bearing > and terminal strip and give it another test. I'll post the Halscope and > comp file tomorrow. > > There isn't much left of the original encoder, so I'm thinking it would > have been better to just get the sensor chip, if it's available.
In case anyone is interested, here is a picture of the setup: http://www.wallacecompany.com/machine_shop/EMC2/AEAT-6010/dcp_6888.jpg ( http://www.wallacecompany.com/machine_shop/EMC2/AEAT-6010/ ) Here is the HALscope: http://www.wallacecompany.com/machine_shop/EMC2/AEAT-6010/AEAT6010_HALscope-1a.png which isn't all that interesting because there isn't much to see. The top trace (blue) is the chip select (active low). The second trace down is the data-out clock which clocks the data bits out on the rise and the comp records on the fall. The green trace shows the value while I turned the knob up. At 1023, the next step drops to 0 or vice-versa. It looks like the sensor is not available separately. There are the austriamicrosystems rotary chips, which are very attractive: http://austriamicrosystems.com/eng/Products/Magnetic-Encoders/Rotary-Encoders but their onesies-twosies pricing is still too high. Too bad, nice product. Now, I need to apply the encoder to feed and spindle override and jog. I suppose I will need to mechanically keep the knob from wrapping, or maybe do it in logic? Since the encoder is absolute, when it gets enabled, it will instantly output whatever value the knob is set for. I wonder this might become a problem? Should there be a way to automatically move the knob to a safe setting? -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
