Logrithmic frequency change when digital pulses thru 6220 DAQ

[DarrenC]

I need to control a stepper motor that will be connected to a robot arm inside of a piece of silicon wafer mfg. equipment.

For stepper motor control, I'll simply be sending digital pulses to the motor. (I say "simply", but I still need to figure out that basic fundamental portion of this equation as well).

Since this robot arm will be handling delicate silicon wafers, it would be best if I can have the stepper motor start slowly, then ramp-up to a faster speed, then stop slowly as well. To do this, I'll need to logrithmically adjust the frequency of sending pulses to the DAQ, but I'm not sure how to accomplish this.

Anybody have any ideas?


Cheers!
-darren

[rpursley8]

I wrote this function to sample a signal with a variable clock. I use Ctr0 to generate the lock. The clock changes in logrithmic steps. If you strip out the analog read functions it might be what you can use (LabVIEW 7.1).