user58405: I am planning to build an rc car based on arduino uno. I will use 3S 11.1 V Li-po to power whole circuitry. So my question is;
First, can arduino be powered directly with 11.1V from its Vin pin? Would it be a problem or not? If it is OK, then no need to answer the bold part below.
If it is not, then one solution comes to my mind is to use a voltage regulator which will convert 11.1 V to 5 V. But while choosing a regulator, I saw that max output current is one of the important specs. So what is the minimum amount of current needed to run Arduino UNO?

user38721: The maximum voltage at the Vin pin is 12V, so using your battery is fine!
Considering the current consumption:
The arduino itself will usually source less than 200mA, but your whole setup will probably sink more than that.

58405: <p>I am planning to build an rc car based on arduino uno. I will use 3S 11.1 V Li-po to power whole circuitry. So my question is;</p>

<p>First, can arduino be powered directly with 11.1V from its Vin pin? Would it be a problem or not? If it is OK, then no need to answer the bold part below.</p>

<p><strong>If it is not, then one solution comes to my mind is to use a voltage regulator which will convert 11.1 V to 5 V. But while choosing a regulator, I saw that max output current is one of the important specs. So what is the minimum amount of current needed to run Arduino UNO?</strong></p>
 38721: <p>The maximum voltage at the Vin pin is 12V, so using your battery is fine!</p>

<p>Considering the current consumption:
The arduino itself will usually source less than 200mA, but your whole setup will probably sink more than that.</p>
