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Topic: 5V input on pin current restriction (Read 230 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.
My hovercraft is full of eels.

No PMs for help please.
DO NOT power servos from Arduino 5V: give them their own power and connect the grounds.

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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