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Unread 01-11-2014, 00:28
Helix Helix is offline
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Smile New and no clue what i am doing

hi guys. this is my first post on the forums. i have recently joined a team, was put into the electrical section, and was tasked with creating a power budget. i think i have gotten most of it down, but was curious, (plus i needed the information) what kind of wifi bridge/ connection device do you guys put on your robots.

thanks
-Helix
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Unread 01-11-2014, 00:34
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EricH EricH is offline
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Re: New and no clue what i am doing

Quote:
Originally Posted by Helix View Post
hi guys. this is my first post on the forums. i have recently joined a team, was put into the electrical section, and was tasked with creating a power budget. i think i have gotten most of it down, but was curious, (plus i needed the information) what kind of wifi bridge/ connection device do you guys put on your robots.

thanks
-Helix
The rules for the last couple of years have required the same bridge type: a D-Link DAP-1522, Rev. B. (Reference the Manual, Section 4.9.2, R55--ask a veteran teammate about that.) It's that white box with a black band on your last year's robot (or in your parts storage if you've already taken that robot apart--you REALLY want to keep the control system!)

That said, there is a possibility of a change, given that we're getting a new control system this year.
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Unread 01-11-2014, 00:40
orangemoore orangemoore is online now
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Re: New and no clue what i am doing

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Originally Posted by EricH View Post
That said, there is a possibility of a change, given that we're getting a new control system this year.
I think they've confirmed that it will be the same through the Behind the Lines episode on the New Control System. I could be wrong.
http://youtu.be/NwV_eNpXfO0?t=20m23s
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Last edited by orangemoore : 01-11-2014 at 00:43. Reason: Support to claim
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Unread 01-11-2014, 00:56
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Re: New and no clue what i am doing

Power budget for FRC Robot:

The drive motors get all the power!
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Unread 01-11-2014, 07:40
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Al Skierkiewicz Al Skierkiewicz is offline
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Re: New and no clue what i am doing

Somebody actually does a power budget, WOW!
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Unread 01-11-2014, 09:56
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Re: New and no clue what i am doing

Quote:
Originally Posted by Al Skierkiewicz View Post
Somebody actually does a power budget, WOW!
This is a very good thing.

The primary electrical constraint for power budgeting will be battery capacity. Our typical battery data sheet indicates about 6 Ah, or roughly 6 minutes of capacity when operating a bit above its 3C discharge rate (3 x 18 = 54 Ampere). So if your robot consumes 60 Ampere average current it will drain a battery in six minutes. Let aggressive students drive your robot around (on carpet) while operating pick-up devices, launchers, etc. in a manner similar to match conditions, and see for yourself how long a battery really lasts. My team has found the six minute figure fairly close, but we base our budget on less.

Also consider how long it takes to charge a battery, at the FRC 6 Ampere charging limit. Ideally, one hour to put back what you can take out in the six minute example above. Count on real recharging times to be longer than that, probably at least twice as long. Again, get real data -- don't rely on ideal assumptions.

Use the figures you get from the activities above to create a plan for managing a fleet of batteries that will get you through a competition, and through the season.
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Last edited by Richard Wallace : 02-11-2014 at 06:10. Reason: fixed link, thank you Ether
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Unread 01-11-2014, 10:09
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Re: New and no clue what i am doing

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Originally Posted by Richard Wallace View Post
Our typical battery data sheet...
Richard, you might want to fix the link. It's broken (has 3 extra characters at the end).


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Unread 02-11-2014, 01:45
Helix Helix is offline
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Re: New and no clue what i am doing

thanks guys. you have all been a great help!!!

-Helix
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