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I want to make mini computer and I want add button for on/off power button. I will change config.txt with dtoverlay=gpio-shutdown. And then add button between GND and GPIO5. There has written that it will start: https://www.raspberrypi.org/forums/viewtopic.php?t=217442

I read and watched many posts and videos, but I've question - Is there risk for burn RPI 3 B+? And is there any way without any risk?

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No, if you connect a button between GPIO3 and GND and use GPIO3 as an input, there is no danger of you burning the Pi. No significant power goes through the switch - it is a signal only.

  • Comments are not for extended discussion; this conversation has been moved to chat. – Ghanima Mar 3 at 13:09
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Adafruit made Read-Only Raspberry Pi which means you could use the wall socket switch without risk of corruption etc.

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