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Hovercraft Question 
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Joined: Thu Oct 29, 2009 10:10 am
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Post Hovercraft Question
Hi, im building a hovercraft and my job is to write the code. We are using a NXT on our hovercraft and we have 4 different sensors on each of the 4 corners of the hovercraft. The hovercraft is suppose to go through an obstacle course in which it follows a black line and makes right turns. My teacher suggested having a feedback system in which the code memorizes the steps the hovercraft took so incase its completely off the course, it can retrace the steps to get back on the black line. We have 2 propulsion fans and a lift fan as well. I just dont understand my teacher completely. Can you help me out? Just guide me towards the right direction, maybe a tutioral or something. Thanks for any help!


Thu Oct 29, 2009 10:16 am
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Joined: Tue Jan 20, 2009 3:02 pm
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Post Re: Hovercraft Question
Since you have no way of measuring distance traveled as in a wheeled robot (revolutions of wheels) you will not be able to really know the location of the hovercraft to the line if you get lost. Hovercraft are unstable and require constant corrections to go straight and they drift badly going around turns. If you have a GPS or compass sensor you might be able to do a very large route but you may have bitten off more than an automous robot can chew. Make this thing remote control and you might have a do-able project.


Tue Nov 10, 2009 5:38 pm
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Joined: Mon Oct 19, 2009 7:16 pm
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Location: Texas YeeHa!
Post Re: Hovercraft Question
You would need some way of tracking the position without actually touching the ground.

You could try using an optical mouse.

http://www.bartneck.de/wp-content/uploa ... -small.pdf


Wed Nov 11, 2009 1:33 am
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Post Re: Hovercraft Question
An optical mouse only works if the sensor is no more than 1-2mm away from the surface. Anything more than that and it will fail to track anything.

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Wed Nov 11, 2009 4:16 am
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Joined: Mon Oct 19, 2009 7:16 pm
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Location: Texas YeeHa!
Post Re: Hovercraft Question
I was thinking the same issue. Maybe placing the sensor in the bladder and using a see-through patch.

Here they have solved the problem. Using an indoor positioning system.

http://robots.net/article/2946.html
http://pacman.elstonj.com


Thu Nov 12, 2009 5:06 am
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