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Topic: 5V input on pin current restriction (Read 224 times) previous topic - next topic

mortonc

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.

JimboZA

Afaik, current isn't imposed by the supply, it's drawn by the consumer.
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Don't read too much into my being a Faraday Member: that just means I post a lot, not that I know much.

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CrossRoads

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.

MarkT

Just be sure its a _regulated_ 5V supply, if it outputs more than 5.5V you'll trash the
board.
[ I won't respond to messages, use the forum please ]

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