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Unread 03-30-2002, 03:26 PM
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Gui Cavalcanti Gui Cavalcanti is offline
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Talking Meeting at Nationals

Hey guys!

Last year at Nationals 422 tried to pull of a programming conference, but it didn't work very well. Our lead programmer then graduated and left his legacy to me; namely, the Codex and the programmers conference. Here's what I'm wondering:

Would you guys (programmers of the various teams) like to meet at Nationals and discuss new coding algorithms, control schemes, projects, etc.? We'd probably meet Thursday and/or Friday during lunch, but I'd only want to meet if I knew some people were going to show up. We'll give out fliers at Nationals.

Also, related to the website passed down to me...

422's had a bad year school-wise. Our school just moved, and they didn't like us to begin with, so they've pretty much killed our webserver. We can't physically find it anywhere in the school, and it's only connected 1/4th of the time it's supposed to be. Therefore, the old CODEX we had to help beginner and advanced programmers, is permanently disabled. Would any team please, please help me establish a multi-team website dedicated to helping FIRST programmers by posting projects, beginner and advanced tutorials, and other helpful things on there? We'd need a domain name and server space, two obstacles I don't know how to overcome (I'm a programmer, not a webhead), but it would be a really cool project that would pay off.

Thanks!
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Unread 03-30-2002, 04:50 PM
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Someone on our team has an address we use. I can talk to him and mabey you guys can use it too? I need to talk too, and some type of money/candy might be needed to bribe him. Stay tuned....
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Unread 03-30-2002, 05:30 PM
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Re: Meeting at Nationals

Quote:
Originally posted by Gui Cavalcanti
We'd need a domain name and server space, two obstacles I don't know how to overcome (I'm a programmer, not a webhead), but it would be a really cool project that would pay off.

Thanks!
I just happen to work for an ISP...I'll see what I can do...
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Unread 03-30-2002, 07:41 PM
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I wanted to upload our code to that from this year, we had two things that may be of interest to teams out there:

1.The code is broken into sub programs so teams can see what it takes to break their program into slots

2.Successful implementation of Crab steer using an Inverse SIN algorythm that should be at least a starting point for teams wondering what it takes to do crab steering.

All of it is fully commented just tell me your new address

Matt
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Unread 03-31-2002, 03:00 PM
VanWEric VanWEric is offline
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hmmm

I will definately attend the programmers convention. Please track me down in the 250 pits if i forget, which i will. As for the ISP, my freind runs a page in his basement on slackware. He may host something. maduin.yi.org
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Unread 03-31-2002, 08:42 PM
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if there was/is a programming confrence at nats, i'm sure both me and dan would attend. from what i've heard/seen, we did a lot of programming for a rookie team, but i'm still clueless about a lot of things. i'd love to learn more, because every little bit could help. just remind me (team 810) at nats, and i'm sure i'll come.
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Unread 04-01-2002, 04:41 PM
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good to go

Gui -- I convinced Reviek to host the codex. Track me down and i am sure we can have it running within a few moments.
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Unread 04-01-2002, 10:10 PM
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I would be interested in attending the programmer's meeting at Nationals. I oversee the programming of the robot, but did not write any of the code. I will try and bring the two students, who programmed the robot, to the meeting. I would like to find more effecient ways of using PBASIC. Our code does some cool stuff but it is not pretty. We have a delay mechnism to make sure we are attached to the goal before the our arm pulls the goal in.

Once you have you the website set up I would gladly put a link on our web site. We cannot proved you any webspace as our site is growing everyday.

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Unread 04-02-2002, 01:32 PM
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Our head programmer would probably love to attend. Im sure he would be interested in showing off our record code, which allows us to record our movements and play them back.
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Unread 04-02-2002, 02:20 PM
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im sure my teams software crew or maybe just me wouldnt mind joining you guys

Quote:
Originally posted by Matt Reiland
2.Successful implementation of Crab steer using an Inverse SIN algorythm that should be at least a starting point for teams wondering what it takes to do crab steering.
Matt
thought id also mention that my team has found a few different ways of doing crab and that crab steering can actually be a lot simpler and work just as well. my team is using probably the simplest crab steering method and works just as well (not that we dont want to upgrade it to work better, but with time restraints and all it just never got upgraded) . i wouldnt mind seeing how ur using that inverse sin algorithm matt. id like to see how ur going about overcoming the friction of the carpet with it.

just stop by the team 111 pit area and let us know (well all be there).
you can also check out 'StangSense' while ur there...
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Last edited by ChrisA : 04-02-2002 at 02:24 PM.
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Unread 04-03-2002, 04:08 PM
VanWEric VanWEric is offline
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CLue?

Anyone wish to clue me into what crab steering is? My code uses a tank style drive, which is nice and simple, but i would be open to ways to make it prettier
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Unread 04-03-2002, 04:27 PM
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Lightbulb Crab steering

This would be another thing we'd talk about at the programming conference...

I know that swerve steering (i think it's the same as crab... not entirely sure) is where all 4 wheels of your robot rotate on an axis. This is a normal robot:

|| --- ||
| |
| |
|| --- ||

This would be a robot with crab steering moving at 90 degrees to it's front:

= --- =
| |
| |
= --- =

Your wheels can rotate anywhere, so you can move laterally along the playing field without turning (your front stays pointing the front).

It's hard to control because you have to link the joystick with the amount of turn each of your wheels undergoes... I'm still clueless as to how teams can make this mechanically with all four wheels turning.

-Gui
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Unread 04-03-2002, 05:56 PM
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to follow up on guis post and further explain crab drive....

as gui stated your wheels essentially have a 360 degree rotation. lets say you have a robot that has normal wheels...
||---||

||---||

this robot can only move in a front to back motion much like a car.

a robot that has crab drive would have 'crab modules'. basically separate wheel modules which turn about an axis that is perpendicular to the axis of the wheel itself (in other words vertical). the wheel module would be rotated about this axis. the amount of rotation would be measured by a potentiometer that is mounted on top of this crab module (connected to the vertical shaft).

this said our robot that could originally only travel in a forward or backward movement can now move side to side or diagonally according to how far the wheel is rotated about the vertical axis. this in effect gives our robot the ability to move like a crab (crabs in real life normally move in a sideways motion). hence the name 'crab drive'.

(crab modules turning 180 degrees)
||---|| \\---\\ =---= //---// ||---||

||---|| \\---\\ =---= //---// ||---||

if you would like to learn more feel free to stop by team 111 in the pits at nationals. and maybe if this programmers meeting happens we can try to explain some of the coding behind the way it works. (as i stated before there are many many different ways to go about it and i would love to see how other teams go about attaining this goal)

heres a short clip of our robot using crab drive
http://www.wildstang.com/2002/video/crab.mov
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Unread 04-07-2002, 12:04 AM
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A programmers meeting at Nats is a great idea. The Team 180 "spamSoft" crew will support it. Let me know if you need any help to make it happen.

...we were wondering what happened to the CODEX


...got a white paper on the Inverse SIN algorithm?
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Unread 04-07-2002, 06:32 AM
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I'd like to go. Even though I am not one of the code writers, I do understand and aprreceate the logic in it.
Besides, debugging is easier when you understand the language.
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