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Need some help from the auto-rotating monitor experts...
TopJimmyCooks:
@DNA Dan: the pololu motor feedback system is a quadrature setup, so it's really designed to give the actual speed under load v/s programmed speed for robots. No positive position which is what we would be able to use,and what you get with a stepper motor, or to a lesser extent, with servo. I'm not doing anything with it.
DNA Dan:
That sucks. So when they say "The jrk 21v3 motor controller is a highly configurable brushed DC motor controller that supports four interface modes: USB, logic-level serial, analog voltage, and hobby radio control (RC). The controller can be used with feedback for closed-loop speed or position control, or it can be used without feedback as an open-loop speed control."
What exactly does "position control" entail? You can only offset values based on load that the board is receiving from the motor? The servo and stepper motors have their own dedicated boards, I assume with more logic chips on them. It doesn't look like they support command line scripting for the stepper motors, just the DC motors and servos.
TopJimmyCooks:
It's been a while. I have the SMC board, not the Jrok. I understood that the software could give position by counting quadrature pulses, but since my system, rather than being a low lash geared setup, was a friction wheel with limit switches, I surmised that counting 64 pulses (or whatever it was, can't remember, but it wasn't a big number) per rev would not work well for positive position with all the other factors. Pulses may be acceptable once multiplied up by gear ratio, but the friction aspect/any wheel spin messes it up for me. It's relative positioning, but not positive positioning in the way you get with a stepper.
kahlid74:
Quick question, how do I mount the shaft to the rotating monitor? I saw on Ond's he used a metal contraption but I'm not to familiar with what part that would be. I've looked at a bunch of parts but can't seem to find one that would make sense.
Le Chuck:
Floor flange to VESA should suffice. Centering will take some work because center on a lot of mounts doesn't result in a centered rotation.
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