Kenneth Lerman wrote: > > I think if you look at the capabilities of the Bone, it might be hard to > justify adding your board. (Note that I haven't looked at the detailed > specs.) > > The Bone has multiple encoders support. How does the rate supported > compare with the rate of your boards? The Bone can drive multiple > steppers at a high rate. Compare with your boards. The Bone has multiple > pwm outputs. How do the number of outputs, resolution, and rate compare > to your boards? > My boards have high-current 5V outputs, and the latest PWM controller has switch-settable digital filters on the encoder inputs, so you can have 1, 2.5, 5 and 10 MHz count rates from the encoders. The PWM counters are clocked at 40 MHz, so you can have 800 pulse width steps at a 50 KHz PWM frequency.
I think the Bone has 3.3 V I/O (the original Beagle was 1.8 V) with limited current capability, so you still need some kind of level/current translator for a lot of things. The PPMC system has 16-bit DACs for analog velocity servos, and each DIO board has 16 opto-isolated digital inputs plus place to mount 8 solid state relays for output. You can plug in multiple DIO boards as needed for more complex systems. I think our stepper controller may be superseded by what the PRU step generator will likely be able to do, but it can go to 300,000 steps/second, with only 3% timing jitter. And, it can handle encoder inputs also. Jon ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
