I have made a custom hat for my B+ and (without going further into detail) it so happens that GPIO14 is connected to a pin on my hat on which I have a +12V supply. I am not intending to use GPIO14 but I was wondering if there are any potential problems with having +12V sitting on this port, or if I need to avoid this physical connection? Would it make sense to configure GPIO14 as an output (or input for that matter), or is it irrelevant?
Thanks,
sebbesen
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RaTTuS
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Re: +12V on GPIO
+12V passed anywhere on the GPIO will kill your RPi
How To ask Questions :- http://www.catb.org/esr/faqs/smart-questions.html
WARNING - some parts of this post may be erroneous YMMV
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WARNING - some parts of this post may be erroneous YMMV
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Covfefe
Re: +12V on GPIO
Yes, it is a problem.
You will probably damage the GPIO circuit for that pin, and maybe all of the other pins too.
You may also damage the CPU and other circuitry.
I suggest that you break the 12V trace leading to that pin on your PCB.
You will probably damage the GPIO circuit for that pin, and maybe all of the other pins too.
You may also damage the CPU and other circuitry.
I suggest that you break the 12V trace leading to that pin on your PCB.
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sprinkmeier
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Re: +12V on GPIO
Are you familiar with the "magic smoke" theory of electronics?
https://en.wikipedia.org/wiki/Magic_smoke
Your hat sounds like a great introduction to the field.
https://en.wikipedia.org/wiki/Magic_smoke
Your hat sounds like a great introduction to the field.
Re: +12V on GPIO
Thank you for your answers. I guess I will cut the physical connection between +12V on my hat an the GPIO 
It's really not a big deal, I was just wondering.
It's really not a big deal, I was just wondering.