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Unread 12-03-2008, 17:52
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Ken Streeter Ken Streeter is offline
Let the MAYHEM begin!
FRC #1519 (Mechanical Mayhem)
Team Role: Engineer
 
Join Date: Feb 2005
Rookie Year: 2005
Location: Team: Milford, NH; Me: Bedford, NH
Posts: 472
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Re: Gyro Repeatability, Expected Drift ?

Quote:
Originally Posted by de_ View Post
Unfortunately due to our location, it will cost us over $60 in shipping alone
Since you are in Canada, you may want to instead order the ADXRS300EB from www.digikey.com. Click on the Canadian flag to get Canadian pricing. (Looks like $58 Can.) Digikey will be able to ship to you from a Canadian warehouse, which should expedite the shipping and cost less than having the product shipped from the USA.

The ADXRS300EB is essentially equivalent to the SparkFun card. We placed ours in a standard 20-pin IC socket in order to avoid soldering directly to the board.

Disclaimer: I have no association whatsoever with Digikey, other than having ordered an ADXRS300EB earlier this week so that we'd have two -- one to use on both of Team 1519's two robot configurations. It arrived in a couple days as expected.

Best regards,
--ken

PS: For what it's worth, the 2.25 laps (9 lines) of autonomous in 15 seconds that we do with Speed Racer uses Kevin's gryo code with an ADXRS150, used "as a compass." There are three completely separate runs in the video. We're not sure how much of our error is due to using only a 150-degree/second gyro; we think that most of the trouble we have with driving a straight line is due to the "steering lag" in the closed loop control. For bias calibration, we use Kevin's routine while the robot is disabled as he describes above.
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Ken Streeter - Team 1519 - Mechanical Mayhem (Milford Area Youth Homeschoolers Enriching Minds)
2015 NE District Winners with 195 & 2067, 125 & 1786, 230 & 4908, and 95 & 1307
2013 World Finalists & Archimedes Division Winners with 33 & 469
2013 & 2012 North Carolina Regional Winners with teams 435 & 4828 and 1311 & 2642
2011, 2010, 2006 Granite State Regional Winners with teams 175 & 176, 1073 & 1058, and 1276 & 133
Team 1519 Video Gallery - including Chairman's Video, and the infamous "Speed Racer!"

Last edited by Ken Streeter : 12-03-2008 at 17:54.