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Unread 19-12-2007, 17:21
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Re: pic: Game hint

Quote:
Originally Posted by jerry w View Post
actually our team did use the battery that way one year.

Come on Mr. Bill.
You have seen some of the things first has done in the past. Maybe they forgot that the 3 pin connector for a digital input has +5 volts on one of the pins. So, why connect to and draw power from the breaker panel to operate this board?

Did they need a 5 volt regulator on the board and on the robot controller?

I think you are looking at only half of the system here. for IR communication, the robot will have a transmitter. the IR receiver is the half that is placed on the field. we can use any old handheld remote for now. but we will have something else in the kit of parts.

jerry w

We've been known to use a battery that way as well. Why waste that much weight and compensate for it elsewhere?

I really doubt FIRST would "forget" +5vdc is there. But, then again, the GTS from the 2005 KOP required +12vdc. as well, and it had to come from the battery. Besides, here are some quotes from the Users Guide:
Quote:
"Assuming a 12VDC supply,"
and
Quote:
"Voltage should be in the range 7-15 volts
DC. Your power supply will have to be independent, for example, a 6 x AA
battery pack, 9V battery, 12V battery....."
So, if the robot will have the transmitter, then why manufacture one receiver board, at a minimum, per team and also spend the money and manpower on shipping?

As for a transmitter being in the KOP, I definitely agree, that is a possibility!

I guess all this back and forth is fine for now. We both will know for sure come Kick Off.
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Unread 19-12-2007, 17:25
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Re: pic: Game hint

So, I was thinking. Could it be possible even though all rational people might say this game will never happen ... Does IR work underwater? Or more importantly, through an air-water interface? ... sigh ... I was going to sleep over the holidays, now I'm wrapped up in the mayhem too ...
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Unread 19-12-2007, 17:40
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Re: pic: Game hint

Quote:
Originally Posted by Rich Kressly View Post
So, I was thinking. Could it be possible even though all rational people might say this game will never happen ... Does IR work underwater? Or more importantly, through an air-water interface? ... sigh ... I was going to sleep over the holidays, now I'm wrapped up in the mayhem too ...
Light does pass through the air water barrier but it bends as it does so.
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Unread 19-12-2007, 18:03
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Re: pic: Game hint

I know pretty much for certain we'll get some IR emitters in the kit. Anyone ever stalled a Fisher-Price? (sorry, couldn't resist)
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Unread 19-12-2007, 18:06
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Re: pic: Game hint

Quote:
Originally Posted by Daniel_LaFleur View Post
Light does pass through the air water barrier but it bends as it does so.
Water's refractive index is about 4/3. Light originating on the water side will be partially reflected (back into the water) and partially refracted (into the air) at angles given by Snell's Law. Light originating in the water and incident on the surface at an angle greater than about 49 degrees will be totally reflected back into the water.

So some underwater positions will permit better transmission of IR than others.
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Last edited by Richard Wallace : 19-12-2007 at 18:09.
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Unread 19-12-2007, 18:18
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Re: pic: Game hint

Quote:
Originally Posted by Richard View Post
Water's refractive index is about 4/3. Light originating on the water side will be partially reflected (back into the water) and partially refracted (into the air) at angles given by Snell's Law. Light originating in the water and incident on the surface at an angle greater than about 49 degrees will be totally reflected back into the water.

So some underwater positions will permit better transmission of IR than others.
I wasn't going to get into the math of it because it's highly unlikely that we'll need to transmit (or recieve) through the air/water barrier.

Also, you will most likely be able to transmit at greater angles because the surface of water will (most likely) never be a perfect plane.

Snell's law could come into play though if you tried to protect your sensor with polycarbonate ... which also makes me wonder if polycarbonate is opaque to IR ... Hmmmmm
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Unread 19-12-2007, 18:25
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Re: pic: Game hint

Polycarbonate isn't opaque to IR
I think...
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Unread 19-12-2007, 18:46
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Re: pic: Game hint

Quote:
Originally Posted by mizitchell View Post
Polycarbonate isn't opaque to IR
I think...
I can just see robots with polycarbonate "banners" like we had on our robot last year with nylon cloth.

-vivek
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Unread 20-12-2007, 06:55
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Re: pic: Game hint

Quote:
Originally Posted by Rich Kressly View Post
So, I was thinking. Could it be possible even though all rational people might say this game will never happen ... Does IR work underwater? Or more importantly, through an air-water interface? ... sigh ... I was going to sleep over the holidays, now I'm wrapped up in the mayhem too ...
Quote:
Originally Posted by Daniel_LaFleur View Post
Light does pass through the air water barrier but it bends as it does so.
Bananas bend ...





.
(whatever that dot means)
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Unread 20-12-2007, 09:22
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Re: pic: Game hint

Quote:
Originally Posted by GaryVoshol View Post




.
(whatever that dot means)
Typically it's used to end sentences while writing.
Atypically, it's used to amuse certain NASA employees & screw with your head.

Note that a " . " is also called a period, and thus could be a clue as to the return of a game with periods in it such as 2006.

But then again... maybe not.
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