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Addendum:
It's my intent to design a daughter-board that fits onto the Pi's GPIO pins, and to make it generally available. Cigarette lighter USB power options don't work - they're usually cheap and inferior, and mechanically too fragile. I'd like to incorporate a high quality power supply onto the PCB. It could provide 5v and 3v3 directly, but I'd definitely like to bypass feeding the Pi power through the micro-USB port, for obvious reasons.
Also, I'd like it to be able to monitor, for example, the A/C compressor circuit, so a bullet-proof way to, again, drop the extremely hostile +12v to a clean 3v3 would be nice.
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