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Unread 16-02-2007, 15:27
robbrad robbrad is offline
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Extra Battery

Is it legal to put an Energizer alkeline 9V on my arm to control custom circuitry which includes a servo? Technically, a servo is a mechanical unit that happens to have a motor inside. 9V power doesn't drive a motor, a PWM signal from the RC does. I don't see any complications with rule <R63>. Any thoughts?
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Unread 16-02-2007, 15:29
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Re: Extra Battery

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Originally Posted by robbrad View Post
Is it legal to put an Energizer alkeline 9V on my arm to control custom circuitry which includes a servo? Technically, a servo is a mechanical unit that happens to have a motor inside. 9V power doesn't drive a motor, a PWM signal from the RC does. I don't see any complications with rule <R63>. Any thoughts?
No other battery will be allowed.
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Unread 16-02-2007, 15:29
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Re: Extra Battery

I believe all power sources must come from either the 12-volt or the backup battery. No fuel cells, additional batteries, solar panels or gerbils allowed.
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Unread 16-02-2007, 15:33
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Re: Extra Battery

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Originally Posted by geeknerd99 View Post
I believe all power sources must come from either the 12-volt or the backup battery. No fuel cells, additional batteries, solar panels or gerbils allowed.
wait one minute, what if you took a gerbil and hooked its wheel to a FP motor and used that as a generator?
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Unread 16-02-2007, 15:38
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Re: Extra Battery

<R59> says all 12V power must come from the lead-acid battery. I want 9V. <R53> says that all main power must come from the lead acid battery. I see custom circuitry power as secondary power. Can you give me a rule # to back-up your opinion?
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Unread 16-02-2007, 15:43
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Re: Extra Battery

<R53> prohibits any source of electrical energy besides the ES17-12 battery.
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Unread 16-02-2007, 16:28
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Re: Extra Battery

If your servo needs a +9 volt input, you may want to use a voltage regulator circuit which will lower the voltage from 12v to 9v. These are readily availible at RadioShack or your favorite overpriced electronics provider.

You might consider this:

http://www.radioshack.com/product/in...entPage=search

Hope this helped.
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Unread 16-02-2007, 16:48
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Re: Extra Battery

Before spending too much time figuring out if your extra battery is legal, also decide if your servo is legal. I would say it likely isn't. Please follow the 2007 Parts Use Flowchart on Page 19 of section 8 of the manual.
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Unread 16-02-2007, 16:53
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Re: Extra Battery

<R45> Items specifically permitted on 2007 FRC ROBOTS include:
• Additional HITEC HS-322HD Servos.

I believe only HITEC HS-322HD servos are legal.
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Unread 17-02-2007, 10:18
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Re: Extra Battery

All of you are right, only the Hitech servos will be allowed, and all power on the robot must be derived from the ES 17-12 or the backup battery.
Sorry.
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Unread 17-02-2007, 10:23
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Re: Extra Battery

Quote:
Originally Posted by imax48236 View Post
If your servo needs a +9 volt input, you may want to use a voltage regulator circuit which will lower the voltage from 12v to 9v. These are readily availible at RadioShack or your favorite overpriced electronics provider.
You can't put custom circuits in between the RC and any motors including servos. The servo must be directly connected to the PWM output on the RC. It already provides the correct voltage (7.2v) which comes from the backup battery.
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Unread 17-02-2007, 16:09
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Re: Extra Battery

The only power allowed is the power from the 12V battery or a 7.2 back up
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