Connect 5V pin to external 5V regulated power

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hi,

i see people saying can damage arduino or usb port, other people it's totally safe.

here it's: powering arduino 5v regulated external power using 5v pin of arduino. need connect arduino computer using usb debug code. question is: keeping arduino powered 5v external regulated power @ same time usb connected, damage arduino?

the "10 ways destroy arduino" not , many people damage , others looking @ datasheet of arduino uno (i think it's datasheet of atmega) cause no problem.

so truth?

the truth both  :smiley-lol:  ::)  :smiley-eek:

i time, has consequences.

1 ) 5v regulator power supply can introduce lot of noise, or voltage can 5.5v. there many bad power supplies out there. use , safe , certified power supply.

2 ) in cases voltage regulator on arduino board blown. prevent that, add diode (a normal 1n4007) 5v pin vin pin. or solder directly on 5v voltage regulator.

3 ) current can flow usb bus computer. arduino uno checks vin, , if above 6.6v, usb power turned off. when power applied 5v pin, vin low, , usb power not turned off. result in current through mosfet , usb bus , computer. that's not good, don't care. perhaps 5v power supply gets little hotter should. of 5v power supplies have lots of amps, there still polyfuse in path computer.


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