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Unread 24-01-2005, 00:54
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Re: Ideas distingushing between middle goals?

Quote:
Originally Posted by Zalumaskov
I was just wondering about how to get the robot cam to find the middle of the three goals. I am considering having it scan for all three and use the middle pan value to get the center goal. Does anyone have any suggestions/other ideas?
This is something I kinda cooked up--season to taste:

Step 1: Know where you're starting, and make sure the robot knows, too. (A couple of switches on the digital inputs will solve that.)
Step 2: Via dead-reckoning or counting revolutions or something like that, get somewhere in the ballpark of the center goal. (Your robot should, after all, know how to get within a few feet, even if you're bumping a tetra out of the way.)
Step 3: Now let the camera do its thing.

As long as you don't have a really huge field of view, I'm willing to bet you should be good to go when it comes to the center goal.

Hope this helps!
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Unread 24-01-2005, 01:00
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Re: Ideas distingushing between middle goals?

Quote:
Originally Posted by Billfred
This is something I kinda cooked up--season to taste:

Step 1: Know where you're starting, and make sure the robot knows, too. (A couple of switches on the digital inputs will solve that.)
Step 2: Via dead-reckoning or counting revolutions or something like that, get somewhere in the ballpark of the center goal. (Your robot should, after all, know how to get within a few feet, even if you're bumping a tetra out of the way.)
Step 3: Now let the camera do its thing.

As long as you don't have a really huge field of view, I'm willing to bet you should be good to go when it comes to the center goal.

Hope this helps!
I would suggest (read: I will be) reversing steps two and three. Measure where you are (with encoders, or an absolute positioning system like StangPS) WHILE letting the camera track. Then, once you've got the vision tetra, you should be able to figure out what you have to do to get over the center goal.
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Unread 24-01-2005, 01:14
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Re: Ideas distingushing between middle goals?

That is what I was thinking before I realised that there are yellow triangles in the goals. Our problem comes from using 4wd with skid steer, which I cannot immagine would work very well with dead reckoning stuff. Am I right on that, or do robots tend to always skid the same way?
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Unread 24-01-2005, 02:22
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Re: Ideas distingushing between middle goals?

Quote:
Originally Posted by russell
That is what I was thinking before I realised that there are yellow triangles in the goals. Our problem comes from using 4wd with skid steer, which I cannot immagine would work very well with dead reckoning stuff. Am I right on that, or do robots tend to always skid the same way?
Blind dead reckoning works with any kind of robot, because its path is determined experimentally. Unfortunately, while that would have worked great last year, and it will work fine this year for knocking down the hanging tetras, it won't do you any good for finding the vision tetra. You do get a lot of inaccuracy with encoders and skid steer, because your powered wheels do a lot of slipping, and it's hard to estimate how much they are actually going to slip.
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Unread 24-01-2005, 15:11
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Re: Ideas distingushing between middle goals?

Quote:
Originally Posted by jgannon
Blind dead reckoning works with any kind of robot, because its path is determined experimentally. Unfortunately, while that would have worked great last year, and it will work fine this year for knocking down the hanging tetras, it won't do you any good for finding the vision tetra. You do get a lot of inaccuracy with encoders and skid steer, because your powered wheels do a lot of slipping, and it's hard to estimate how much they are actually going to slip.
This is a great example of why the software and hardware design teams need to talk to each other. As the software guy, I told the hardware design guys that I strongly preferred using wheel encoders, which meant I wanted a drive system that did not have wheel slippage inherent in the design. Four-wheel drive systems must slip when turning, unless special measures are taken (like car-steering or those crazy roller wheels that slide sideways).

Two wheel systems are very easy to drive and control, and they don't slip while turning, so wheel encoders have a chance of being useful.
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