Go to Post At 300 miles per hour, nobody'll tell the difference. - Hitchhiker 42 [more]
Home
Go Back   Chief Delphi > Technical > Programming
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #14   Spotlight this post!  
Unread 07-11-2003, 14:04
Chris Hibner's Avatar Unsung FIRST Hero
Chris Hibner Chris Hibner is offline
Eschewing Obfuscation Since 1990
AKA: Lars Kamen's Roadie
FRC #0051 (Wings of Fire (on sabbatical))
Team Role: Engineer
 
Join Date: May 2001
Rookie Year: 1997
Location: Canton, MI
Posts: 1,489
Chris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond reputeChris Hibner has a reputation beyond repute
Quote:
Originally posted by Burgabot
So, you'd recommend that I use last year's gyro for speeds less than 75 degrees/second, one of Future's for speeds greater than 75 and less than 300, and accelerometers for any thing greater than 300?
Sorry for two posts in a row...

I would use last year's gyro for speeds less than 50 deg/sec, the 300 deg/sec gryo for less than 200 deg/sec. If you know absolutely, 100% FOR SURE what your worst-case speed is, you can reduce the margin (like use the 75 deg/sec gryo up to 65 deg/sec). Just be sure you account for getting bumped by other robots.

Also, I don't know if I would ever recommend using accelerometers. Our team actually thought of doing this last year (before we found the 300 deg/sec part), but we found a lot of potential problems. We decided that if we had to, we would be better off building an old-fashioned mechanical gyroscope and measuring the gymbal angle with a potentiometer.

If you do go with accelerometers, be sure you select the G-range appropriately. In other words, calculate out how much acceleration they will see in normal usage, then apply a little margin, then buy accelerometers in this range. Most accelerometers you'll find will be like +/- 50 G's. This will give you WAY too little resolution. You'll probably need a low-G accelerometer (like +/- 5 G), which you will pay an arm and a leg for.

-Chris
 


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Quick <hr> question Jack Website Design/Showcase 1 31-01-2003 22:19
To all the ladies in the hiz-ous!! lol a quick question archiver 2001 1 24-06-2002 02:12
Quick Question archiver 2001 5 24-06-2002 00:08
A quick question Joelster Technical Discussion 6 10-02-2002 09:09
Quick Question, i guess Andrew Rudolph Motors 1 12-08-2001 14:39


All times are GMT -5. The time now is 22:41.

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