Go to Post ..the way we see it FIRST isn't about winning a robot contest, its about trying your best to complete a really really hard task in a really really short amount of time. - Stuart [more]
Home
Go Back   Chief Delphi > Technical > Control System
Team 51   CD-Events   CD-Media   CD-Swap   CD-Spy   FRC-Spy   Unsung FIRST Heroes   WFA
portal register members calendar search Today's Posts Mark Forums Read FAQ rules
VEXpro
The Chief Delphi Forums are sponsored by Innovation First International, Inc.
Modulox
ADVERTISEMENT

 
Reply
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 01-30-2012, 08:39 AM
GallifreyOne GallifreyOne is offline
Registered User
FRC #0375 (The Robotic Plague)
Team Role: Engineer
 
Join Date: Jan 2012
Rookie Year: 2010
Location: Staten Island, NY
Posts: 1
GallifreyOne is an unknown quantity at this point
Sensing Angular Position Question

In order to sense an angular position a three terminal variable resistor may be connected to one of the analog ports on the robot. Would a 1K pot work the same as a 10K pot as a sensor? How is the output displayed on the driver's station computer?
Reply With Quote
  #2   Spotlight this post!  
Unread 01-30-2012, 08:53 AM
MrForbes's Avatar
MrForbes MrForbes is offline
Registered User
AKA: The mentor formerly known as squirrel
FRC #1726 (N.E.R.D.S.)
Team Role: Mentor
 
Join Date: Feb 2006
Rookie Year: 2006
Location: Sierra Vista AZ
Posts: 4,794
MrForbes has a reputation beyond reputeMrForbes has a reputation beyond reputeMrForbes has a reputation beyond reputeMrForbes has a reputation beyond reputeMrForbes has a reputation beyond reputeMrForbes has a reputation beyond reputeMrForbes has a reputation beyond reputeMrForbes has a reputation beyond reputeMrForbes has a reputation beyond reputeMrForbes has a reputation beyond reputeMrForbes has a reputation beyond repute
Re: Sensing Angular Position Question

The only noticeable difference is that the 1k pot will draw 10 times as much current from the 5v reference supply, compared to a 10k pot.
Reply With Quote
  #3   Spotlight this post!  
Unread 01-30-2012, 10:35 AM
Alan Anderson's Avatar
Alan Anderson Alan Anderson is offline
Software Architect
FRC #0045 (TechnoKats)
Team Role: Mentor
 
Join Date: Feb 2004
Rookie Year: 2004
Location: Kokomo, Indiana
Posts: 7,051
Alan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond repute
Send a message via AIM to Alan Anderson
Re: Sensing Angular Position Question

The default dashboard shows the voltages being applied to all of the inputs of the analog breakout board on the module in cRIO slot 1. It updates slowly, so you won't be able to see the details of a fast-changing input. If you want to monitor it on the dashboard more quickly, you'll have to put it in the "high priority" dashboard data stream from the robot and pull it out for display in your own dashboard code.
Reply With Quote
  #4   Spotlight this post!  
Unread 01-30-2012, 09:31 PM
DonRotolo's Avatar
DonRotolo DonRotolo is offline
Is wishing HE had summers off...
FRC #1676 (Pascack PI Oneers)
Team Role: Mentor
 
Join Date: Jan 2005
Rookie Year: 2005
Location: Montvale NJ
Posts: 5,528
DonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond reputeDonRotolo has a reputation beyond repute
Re: Sensing Angular Position Question

12/10000 of an amp is a very small current indeed, circuits will be happy there.

12/1000 of an amp is getting close to the limits of what the circuit can deliver, but with little or no additional load you'll be OK. Certainly a 1k pot will be fine for testing, and a 10k pot will provide (about) the same voltage per degree, so you can swap one in some later time with little or no changes to the software.
__________________

I am N2IRZ - What's your callsign?
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 06:39 PM.

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


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd.
Copyright © Delphi and Pontiac Central High School