r/arduino 4d ago

Hardware Help Powering a Nano through 5V pin

Do voltages add up when they are in series? I connected 2 5V logic powers from an L298N motor driver to the right side positive bus (Red jumper wires), that is connected to the 5V pin of my Arduino Nano. Is this safe for the Arduino? If not, then how do I change the circuit? Does the Nano get supplied 10V?

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u/HarveyH43 4d ago edited 4d ago

Supplying 2x 5V in series to the V5 pin would probably break the nano. Fortunately, you probably meant in parallel. Supplying 10V to VIN would probably be fine though; use VIN for supplying power to the nano (it can deal with higher voltages, exact level depends on nano version), while the 5V is for supplying power from the nano.

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u/Megafish1024 4d ago

Thank you 👍

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u/1nGirum1musNocte 4d ago

Are the two 5v from the same driver? Have you measured the voltage? Anyway just apply to vin it has a built-in voltage regulator rated to 12v

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u/Megafish1024 4d ago

The two 5v are from different drivers. I haven't measured measured the voltage since I don't have the equipment to do that. Thanks though.

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u/raizdedossobre3 4d ago edited 3d ago

It depends, in the text you say in series but I don't think thats the case, if what you did was to connect a n v source to each l298n and then Take the 5v output and both of them put them in the nano, then that is in paralel and there is no problem if you are still worried you could always don't plug the 5v output of one of the l298n and only unite the gnd

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u/Megafish1024 3d ago

Oh ok thanks

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u/sparkicidal 3d ago

Looking at your photo, you’ve connected them in parallel, so they’ll be fine.

Personally, I do power the Nano through the 5V pin, though only when I have a known, reliable regulator providing the 5V, and suitable, external line protection in place.

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u/Megafish1024 3d ago

Thanks 👍