Possibly the effect of ESD was mistakenly assumed to be from 5V.
Maybe OP was simply shocked that nothing happened
Forum members have previously posted projects where the PCB ground was connected the live mains.
Exactly. Some seem to willing to leave this planet early. Some might at least realize this can be as dangerous as touching the metal framework of old black and white televisions when plugged into mains...
It seems the OP is new at Arduino and does not have a electrical background. Is the goal of this forum to provide some useful help or recount old issues?
@janmar
Touching 5V is not inherently dangerous.
However it is a good thing to verify the source of the 5V is via a power supply that has some safety approval like CE or UL etc. This will verify the power supply is not connecting you to the mains voltage.
Unsafe power supplies are not unheard of but are not that common.
Great advice, I’ve experienced USB 5V power supply leads connected to
AC mains power.
Treat all power supplies and electronic components with respect.
As a side note, even AA batteries can cause a fire or cause a capacitor to explode.
Edit:
The OP has vanished after touching 5 volts
Care to elaborate?
Nah, he's just off down another rabbit hole!
Due to poor factor soldering, a solder splash connected 5v to AC mains terminal.
Something similar to these:
Chines unbranded of course.
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