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Topic: Arduino Uno max/nominal input current? (Read 5653 times) previous topic - next topic

pikachu

Mar 25, 2011, 05:12 pm Last Edit: Mar 25, 2011, 05:18 pm by pikachu Reason: 1
Hi,

What are the maximum and nominal input currents that the Arduino Uno board handles through each of its power supplies (USB, jack, Vin/GND)? It doesn't say on the official page. The only hint it gives is that it has a 500 mA fuse for the USB connection.

I've verified that hooking up a 9 V battery straight to the Uno works at least short-term, I'm worried about frying it though. Do I need a current limiting resistor in series from the battery into Vin? Also, will using a battery affect performance?

Thanks.

Coding Badly

Quote
Do I need a current limiting resistor in series from the battery into Vin?


No.

Quote
Also, will using a battery affect performance?


No.

CrossRoads

What will help battery performance is not wasting a lot of battery capacity making heat with the 5V regulator.
Look into a switching stepdown regulator if you are really stuck using a 9V battery (like the square ones which have relatively little capacity).
Some examples, with different current capacities:
http://www.pololu.com/catalog/category/84

Then think about running from LiPOs, NiMH, some kind of rechargeable battery.
I purhcased a 1000mAH LiPO from www.gravitech.us for $12 and use it to power an RF remote control (had to ask for it, doesn't appear on their webpage)  and use a MAX1811 charge control chip to recharge from a 5v source.
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.

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