View Single Post
  #11   Spotlight this post!  
Unread 25-02-2013, 23:18
Ether's Avatar
Ether Ether is offline
systems engineer (retired)
no team
 
Join Date: Nov 2009
Rookie Year: 1969
Location: US
Posts: 8,065
Ether has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond reputeEther has a reputation beyond repute
Re: PID vs Bang-Bang for Shooter Consistency

Quote:
Originally Posted by Kevin Sevcik View Post
Bill,
I'm pretty sure that will work for higher RPM unless Labview is somehow mangling the period output and WPILib isn't. We use C++ and I'm doing essentially the same thing on our small wheel shooter and I'm measuring up to 11,000 RPM. Why do you think that's limited to 6000 RPM?
A 1-per-rev sensor should be no problem for FPGA (or WPILib) well over 11,000 rpm.

If there's a high-speed limit, it would be in the sensor itself. That's why I asked him to post a picture of the wheel with the tape on it. If the tape doesn't cover a sufficient angle of arc, at high speeds the pulse width may be too small for the sensor to detect reliably.


Attached Thumbnails
Click image for larger version

Name:	11000rpm 1CPR 1N 10ms.png
Views:	46
Size:	8.2 KB
ID:	14190  
Reply With Quote