OCCRA
Go to Post *speaks into wristwatch* We've got a non-gracious professional here, get Woodie on the phone! - Ringo5tarr [more]
Home
Go Back   Chief Delphi > Technical > Control System > Sensors
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 10-11-2017, 07:32 PM
Dave Hurt Dave Hurt is offline
Mostly Harmless
FRC #6413 (Degrees of Freedom)
Team Role: Mentor
 
Join Date: Aug 2001
Rookie Year: 1999
Location: Chandler, AZ
Posts: 112
Dave Hurt is on a distinguished road
Question on CIMcoder codes per rev

I was curious as to what the codes per revolution were for the CIMcoder. Trying to look through the documentation and it looks like it should be 20, but I wanted to make sure. Thanks!
Reply With Quote
  #2   Spotlight this post!  
Unread 10-11-2017, 07:39 PM
AriMB's Avatar
AriMB AriMB is offline
The Philadelphian emigrant
AKA: Ari Meles-Braverman
FRC #5987 (Galaxia)
Team Role: Mentor
 
Join Date: Mar 2015
Rookie Year: 2012
Location: Haifa, Israel
Posts: 1,265
AriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond repute
Re: Question on CIMcoder codes per rev

According to the AndyMark product page, the CIMcoder has a resolution of 20 PPR (pulses per revolution). Since it's a quadrature encoder, that gives it a CPR (counts per revolution) of 20*4=80. I've never heard of "codes per revolution", but I'm assuming its equivalent to one of those two. There's a decent explanation of the definition of each here.
__________________
Studying MechE at the Technion - Israel Institute of Technology
2017-present: Technical Mentor FRC 5987
2017-present: CSA for FIRST Israel
2012-2016: Member FRC 423 Captian, Programmer (LabVIEW), Electrical, CAD, Manipulator, Chassis, Business, Outreach (everything)
Reply With Quote
  #3   Spotlight this post!  
Unread 10-11-2017, 07:46 PM
Oblarg Oblarg is offline
Registered User
AKA: Eli Barnett
FRC #0449 (The Blair Robot Project)
Team Role: Mentor
 
Join Date: Mar 2009
Rookie Year: 2008
Location: Philadelphia, PA
Posts: 1,606
Oblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond reputeOblarg has a reputation beyond repute
Re: Question on CIMcoder codes per rev

Quote:
Originally Posted by AriMB View Post
According to the AndyMark product page, the CIMcoder has a resolution of 20 PPR (pulses per revolution). Since it's a quadrature encoder, that gives it a CPR (counts per revolution) of 20*4=80. I've never heard of "codes per revolution", but I'm assuming its equivalent to one of those two. There's a decent explanation of the definition of each here.
Edit: Upon searching past threads, this actually appears to be used both ways - CPR can refer to individual counts, or to entire cycles. Huh. That's a possible spot for confusion.
__________________
"Mmmmm, chain grease and aluminum shavings..."
"The breakfast of champions!"

Member, FRC Team 449: 2007-2010
Drive Mechanics Lead, FRC Team 449: 2009-2010
Alumnus/Technical Mentor, FRC Team 449: 2010-Present
Lead Technical Mentor, FRC Team 4464: 2012-2015
Technical Mentor, FRC Team 5830: 2015-2016

Last edited by Oblarg : 10-11-2017 at 07:58 PM.
Reply With Quote
  #4   Spotlight this post!  
Unread 10-11-2017, 07:59 PM
AriMB's Avatar
AriMB AriMB is offline
The Philadelphian emigrant
AKA: Ari Meles-Braverman
FRC #5987 (Galaxia)
Team Role: Mentor
 
Join Date: Mar 2015
Rookie Year: 2012
Location: Haifa, Israel
Posts: 1,265
AriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond reputeAriMB has a reputation beyond repute
Re: Question on CIMcoder codes per rev

Quote:
Originally Posted by Oblarg View Post
You have that backwards. PPR=4*CPR for a quadrature encoder. There are four pulses per cycle.
At first I only saw sources saying what I originally said, but now I am seeing sources for both directions. I remember this being a very confusing and controversial topic in the past. Basically, it seems like different companies are using the same words to mean different things, often without explaining which definitions they are using.

Sources my way:
https://granitedevices.com/wiki/Quadrature
http://www.cui.com/blog/what-is-encoder-ppr-cpr-and-lpr

Sources your way:
http://encoder.com/glossary-of-terms/
https://www.usdigital.com/support/glossary

ChiefDelphi argument:
https://www.chiefdelphi.com/forums/s....php?p=1604976

I still have yet to see "codes per revolution" in any of these search results, so I'm interested in hearing what the OP meant by that.
__________________
Studying MechE at the Technion - Israel Institute of Technology
2017-present: Technical Mentor FRC 5987
2017-present: CSA for FIRST Israel
2012-2016: Member FRC 423 Captian, Programmer (LabVIEW), Electrical, CAD, Manipulator, Chassis, Business, Outreach (everything)
Reply With Quote
  #5   Spotlight this post!  
Unread 10-13-2017, 11:10 AM
Dave Hurt Dave Hurt is offline
Mostly Harmless
FRC #6413 (Degrees of Freedom)
Team Role: Mentor
 
Join Date: Aug 2001
Rookie Year: 1999
Location: Chandler, AZ
Posts: 112
Dave Hurt is on a distinguished road
Re: Question on CIMcoder codes per rev

codes per revolution actually came from the talon srx library. When setting up the talon object, there is a parameter called configEncoderCodesPerRev when using a quad encoder.

Thanks for the feedback everyone, I appreciate it
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 02:18 AM.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi