Drawing power from an I/O pinįor an Arduino Uno, the recommended value in the datasheet from a single I/O pin is 20mA. If you have another Arduino board, you’ll need to look at the datasheet for your board to make sure the values are the same. I also like to use my benchtop power supply to test if a given power source will be enough: you can set the power and maximum current that can be drawn, and see how much of that current is really used by your project.įinally, the maximums discussed here are for the Arduino Uno R3 (Rev 3) and the Arduino Uno Wifi Rev2. The Arduino will switch to the barrel jack as a power source if enough voltage and current are coming in. If you need to have the USB plugged in for debugging, but also need the extra current from the barrel jack, you don’t need to worry about not having the current you need. 25mA should be a safe bet, but since it depends on the features you are using, the best way to know is to measure it with your program running (which is also true of the other devices you want to use. This budget also includes what the Arduino itself draws, which can vary depending on what you’re running on it and how it’s powered.
On the other hand, regardless of where you’re drawing it from, all of the current you draw add up to the maximum that your power supply can offer : When planning the power supply for a project a common question is how much current can I draw from an Arduino? The current you can draw depends on where you are drawing it from the board.
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