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Rule C29
Pin1 of the Analog Input port is intended to power Gyros only.
Other 5V pins on the Analog port are intended to power potentiometers only.
I think rule C29 is pretty clear on the subject of power supplied to custom circuits.
To power any custom circuit, the rule says you MUST use 12V supplied through a 20A breaker. So if your circuit needs 5V, you'll have to provide the power conditioning yourself. The post by kmcclary earlier in this thread provides good instructions on how to do this.
I think one of the intents of the rule is to eliminate the need for FIRST officials to do a safety analysis of each and every custom circuit -- instead they just need to make sure that each custom circuit draws its power from a 20A breaker.
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Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
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