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Originally Posted by Al Skierkiewicz
Your are going to need to be more specific in what you are trying to do. All outputs on the RC are tied back to the +5 volt internally regulated power rail. Although the 5 volts is unused in the speed controllers, it is used in the servos. If you are using the RC for non competition controls there is a variety of things you could do, but... For competition, you may not put any custom circuits between the RC and motors, solenoids, etc. that will affect the devices other than the parts supplied, i.e. speed contollers, spike relays, servos, and team LEDs.
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I was under the impression (from stuff I've read and experience) that the power line on the PWM outputs is 7.2V, direct from the backup battery. I thought only the digital IO and analog ports had 5V.
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Originally Posted by Leet_T3chn0
Sorry, I may have been mis-leading in my previous post.
I'm not planning on using a servo for this project, I'm actually trying to get a magnetic solenoid to extend by providing it with > 7v power.
The solenoid only has 2 wires, ground and Vcc... when >7v (7-9v capable) is supplied, the soleniod will extend, when its removed, the soleniod retracks.
My thought was to use some sort of 3-state buffer that when the PWM is set high, it will relay the Vcc through and provide the soleniod with 7.2v power.
Sorry for the lack of prior detail
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You should be able to accomplish this using a digital IO port to drive a BJT (transistor) that switches power from the 7.2V line avilable from the PWM outputs. Google "BJT switching" or something similar for more info.