Max current for arduino UNO (input)

Development Tools IDE 1.x
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Gentleman, Im having some trouble to find the maximum or ideial current that for the battery I want to feed my Arduino UNO board.

I have a 6v 4,5Ah for a project that uses a servo and its cosnumption is to much, so I want do change to a 12V, but there are several types from 4 to 35 Ah. I know that 12 V would be ok , but the current? 35 would fry the board? 4 is Ok??

thanks for the help.

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3

Are you sure your servo would be o.k. at 12V? I hope you're not thinking of powering the servo from the Arduino 5V pin. Doing that would almost certainly fry the Arduino.

Steve

4

Slipstick, I saw a lot of projects that connects the servo direclty on the 5v pin. I have done it plugged on the usb and it worked well..The servo is for a food feeder it just turns one once a day to open a valve.
What would be you suggestion? The servo is a MG938 connected PIN9, 5v, Gnd, and a RTC DS3231 controls the time the servo should be on.

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I've sometimes connected to the 5V pin too, when I have a single lightly loaded small servo.

But you have a high torque digital servo that will take A LOT of current if it ever stalls and even without stalling the startup current is likely to kill the Arduino's onboard regulator when running from 12V. I would drive it separately from a 5V step-down converter specified for at least 3A.

But you may get away with it, at least for a while.

Steve

6

I've sometimes connected to the 5V pin too, when I have a single lightly loaded small servo.

But you have a high torque digital servo that will take A LOT of current if it ever stalls and even without stalling the startup current is likely to kill the Arduino's onboard regulator when running from 12V. I would drive it separately from a 5V step-down converter specified for at least 3A.

But I guess you might get away with it, at least for a while.

Steve