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Unread 02-07-2008, 01:24 PM
Beck Beck is offline
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IR Board Power

Ok, so I've been trying to resolve this for a while now to no avail... does anyone have input on how to power the IR board?

The document they gave us says "Positive power supply voltage input. 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, bench top supply, or other."

But then again, I don't think other batteries are allowed on the robot, are they? I've noticed several teams on here said they've wired this thing directly to their power distribution block, but I don't want to do that and show up to a regional and be told it's not the way we're supposed to do it (and vice versa for using a different battery) Does anyone have some insight on this?

Thanks,

--Tracy
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Unread 02-07-2008, 01:40 PM
Dancin103 Dancin103 is offline
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Re: IR Board Power

could you power it with the back up battery or the circut breaker?
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Last edited by Dancin103 : 02-07-2008 at 01:45 PM.
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Unread 02-07-2008, 01:43 PM
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Re: IR Board Power

We are going to power our board through the circuit breaker panals. I think that should be up to code.
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Unread 02-07-2008, 02:05 PM
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Re: IR Board Power

Two basic FIRST legal choices are allowed (and adequate) for powering the IR Receiver:

1) Power from the 12v breaker panel, protected by a 20amp breaker (power from the main 12v battery)

2) Power from one of the 7.2v "PWM Output" pins on the Robot Controller (powered by the 7.2v backup battery)

Choice #2 does risk having too little power as the backup battery is close to the lower limit, but will work if you keep the backup battery fully charged at all times. Choice #1 could also fail if a motor surge drops the main battery voltage too low, so keep that battery fully charged as well!


There is a third legal variation to power the board from one of the 5v Robot Controller pins (powered by the main 12v battery and backed by by the 7.2v backup battery), e.g., Analog Inputs or Digital I/O pins, however, this does involve modifying the IR board to bypass the on-board 5v regulator. The advantage here is double battery coverage since any extreme 12v battery drop will be covered by the backup battery.
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Last edited by Mark McLeod : 02-08-2008 at 10:44 AM.
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Unread 02-07-2008, 02:24 PM
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Re: IR Board Power

I guess we'll go with the circuit breakers, then. I have no problem wiring it that way, I just don't want to get there and find out it's wrong. Our team should be submitting a question to the Q&A Fora as well, just to be certain, but it certainly sounds like we'll be fine just using the system 12v power... I'll post back here if I hear anything further. Thanks guys!

--Tracy
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Unread 02-07-2008, 02:40 PM
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Re: IR Board Power

The Q&A has had a few questions about this already.
This is probably the one that bears most directly on your question...

------------------
Q&A Section 8 the Robot--Power Distribution - Circuit protection
http://forums.usfirst.org/showthread.php?t=8539

Q: 3) The Inspection List has raised a few questions in meeting we held. here they are:
* Does the IR circuit has to be used through a 20A breaker?

A: Question 3: The IR receiver circuit must be protected by a 20-amp circuit breaker (see Rule <R55>).
-----------------

This is probably the most related rule:

8.3.8 - Control, Command & Signals System
<R82>
Inputs to custom circuits can be connected to the following sources:
Branch circuit breaker outputs
Speed controller or relay module outputs
PWM, relay or digital outputs on Robot Controller
Switches, potentiometers, accelerometers, sensors, and other additional permitted electronics.
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Unread 02-07-2008, 02:47 PM
Beck Beck is offline
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Re: IR Board Power

Ah, well, I didn't see that when I went through looking for information on it. Well then, we won't bother the GDC with another useless question. Thanks for your help, Mark. ^_^

--Tracy
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