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I've read that Raspberry GPIO ports can't withstand +5v and works only with +3.3 v, and that +5v could potentially permanently damage the port? But what does it mean exactly? Is that specific channel broken meaning that it can't be used reliably neither as an INPUT nor as an OUTPUT, it works as an output but it doesn't work and input?

  • This might help: raspberrypi.stackexchange.com/questions/97949/…. – tlfong01 Sep 12 at 9:22
  • This might also help: raspberrypi.stackexchange.com/questions/96560/…. – tlfong01 Sep 12 at 9:25
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    I accidentally did it but my rasp seem to be working fine. Is there a way to check if the GPIO pins have been somehow damaged, for example if they read an incorrect input value? – Andrea Bianchi Sep 12 at 9:39
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    You are a prisoner of a mindset I urge you to drop. There is no such thing as an 'exact' answer to your question. Electronics is specified to work at certain conditions. When those conditions are not met, everything can happen. If we want to take it ELI5, your question has the same meaning of "can I still go on with my car if I drive into a wall at 50 ?", you can find a lot of people claiming they got away with it but in the end nobody cares: don't do it. – MaxDZ8 Sep 12 at 9:59
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    You have not one, but two correct answers to your question. Select one, please. I've never made this comment to anyone, but I will make it here. This is "laws of physics" stuff, and it is immutable. – Seamus Sep 13 at 0:12
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Applying 5V to a Pi GPIO will destroy the GPIO and the Pi (the Pi may not die immediately, it might take days to cascade the failure through the silicon).

There is a caveat, the Pi/GPIO may survive if the current is very limited, perhaps a few microamps.

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The actual answer is it depends.

If you specify in more detail exactly what you intend to connect we can give you a better estimate of the probability that you will destroy the Pi or GPIO, but no one can give a definite answer because this puts the SOC into an indeterminate state. This can cause catastrophic chip failure, a simple GPIO failure, a latch up failure mode which is recoverable on removing power or if current is limited (which effectively prevents the actual voltage exceeding 3.3V + ~0.7V) no impact.

The simple answer is DON'T DO IT

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