Arduino Micro - External power via VIN/GND or micro USB connection

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phthomps

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Arduino Micro - External power via VIN/GND or micro USB connection

« on: February 10, 2013, 09:29:56 am »

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Hi,
I'm running an Arduino Micro 24/7.
Could you please tell me which of these options is the best way to power an Arduino and why?

1) 7,5V regulated power to VIN/GND (Choosing 7,5v to keep the regulator happy)
2) 5V regulated power to the Arduinos' micro USB connector (Smartphone charger)

Thanks in advance!


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LarryD

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The last thing you did is where you should start looking.

Re: Arduino Micro - External power via VIN/GND or micro USB connection

« Reply #1 on: February 10, 2013, 02:42:37 pm »

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best way to power

They are equally the best, but it is up to you to set your design criteria.

The USB connection bypasses the regulator so no heat is generated on the PCB.

7.5 volts is good since there is no voltage drop or noise experienced from the USB cable. Also the Arduino regulator will give thermal/current limiting protection.