Go Down

Topic: 5V input on pin current restriction (Read 332 times) previous topic - next topic


I wish to power my arduino from an external regulated power supply hooked  up to the 5V and gnd pins. Is there anything I should watch out for?

Is there a limit of the amount of current I should supply to the pins?

I'm looking at a 5v 2.5A supply at the moment.


Afaik, current isn't imposed by the supply, it's drawn by the consumer.
Gone for good


Add a diode from 5V (anode) to Vin (cathode) to avoid reverse driving the regulator.
The board will only draw the current it needs, 30-40mA or so with no IO loads.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.


Just be sure its a _regulated_ 5V supply, if it outputs more than 5.5V you'll trash the
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

Go Up