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Unread 10-11-2009, 07:19
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AKA: Martin Wilson
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Re: pic: 1771 Unveils T-shirt cannon at region championship football game

Quote:
Originally Posted by MikeReilly View Post
While the team worked pretty hard on this, we once again learned so much from our Woody Flowers Award-winning mentor, Martin Wilson from Meggitt Training Systems. Go to www.fatsinc.com to see why he's the perfect man for this job.
I did help with the cannon and lighting, but the students did all the coding and designed and built everything else. As always, they did a fantastic job. We started talking about this project the first week of October, so I am proud of what they got done in just five weeks, using almost all leftover parts we had laying around. All they had to buy were the wheels, some sprockets, and the Lexan covering.

Quote:
Originally Posted by daltore View Post
Sweet, mind if we steal that idea when we build ours (it's quite original, and I wouldn't want to infringe on its uniqueness)?
Anyone is free to use any ides they see fit. If anyone has questions, I'll be happy to answer.

The cannon uses two Bimba 2 1/2" X 8" long 200 PSI stainless steel reservoirs (a little larger than the kit reservoirs) and a differential pressure valve like a potato gun This site has a good discussion of the theory of this valve. Huge reservoir volumes are not necessary, as can be seen in this early test video. The shirt easily cleared the goalpost from the 35 yard line on the hash marks.

The muzzle flash Is a ring of 35 CREE superbright red LEDs in a series parallel arrangement (5 LEDs in series with a 150 ohm restister, 7 of these strings in parallel). Timing is important to get the proper effect. The cannon valve is activated for 100 milliseconds, and the LED ring is illuminated for 100 milliseconds, starting when the valve cycle ends.

The light show on the base is just 8 bright white LED modules hooked up to the cRIO pneumatics module. The LEDS draw less current than a pneumatic valve so it works just fine. Our programmers came up with several different light show patterns that are activated by different joystick buttons.

The thing under the muzzle is just decoration. We had a three light LED module and some stainless steel tubing, so the kids stuck it under the muzzle as a kind of simulated sighting device. It kind of reminds me of the triple laser sight from the Predator movie.

Here is a picture of the team and robot.

Note the wearable drivers' station (the kids came up with that on their own) it has a battery and router in a backpack, with the DS and joystick carried out front
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