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Topic: External POWER Source? - Maximum Voltage and Current to turn on Arduino Uno (Read 492 times) previous topic - next topic

Gedon

... Hi and Sorry if my post has already been asked, but to be more direct in a way

WHAT IS THE RANGE OF VOLTAGE AND CURRENT NEEDED TO TURN ON ARDUINO UNO.?

the recommended voltage to operate atmega328, if i'm right, is 7 - 12V.
i have an ac-dc adaptor which outputs 12V and 1000ma
the voltage is in range, but i'm not sure if the current is.



Gedon

... Hi and Sorry if my post has already been asked, but to be more direct in a way

WHAT IS THE RANGE OF VOLTAGE AND CURRENT NEEDED TO TURN ON ARDUINO UNO.?

the recommended voltage to operate atmega328, if i'm right, is 7 - 12V.
i have an ac-dc adaptor which outputs 12V and 1000ma
the voltage is in range, but i'm not sure if the current is.

Osgeld

current is more than enough, the uno by itself is pretty much nothing (until you go to run if off a battery, then it seems large), the regulator on board which is converting input to 5 volts is limited to (I think 500ma)

you will notice the regulator getting warm if use you 12 volts, cause (12-5) there's 7 volts that has to go somewhere, but that is acceptable... general thinking says if you can hold your finger on it for 5 seconds or more its fine, though it might alarm you if your thinking stuff should not be toasty (it shouldn't but there's math behind how toasty is too toasty, too toasty is darn near baking cookies in this case)
http://arduino.cc/forum/index.php?action=unread;boards=2,3,4,5,67,6,7,8,9,10,11,66,12,13,15,14,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,86,87,89,1;ALL

Nick Gammon

Please post technical questions on the forum, not by personal message. Thanks!

More info:
http://www.gammon.com.au/electronics

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