How to power arduino with 5v power supply?

jayeshshetty's picture


Joined: Jul 03, 2020

Replies: 0
How to power arduino with 5v power supply?
July 3, 2020 - 1:09pm

I know this is a noob question, but I'm kind of struggling to find an answer (maybe because there isn't the one I'm looking for). I have a 5v 15A power supply that I plan to use to power some WS2812B lights I have in a project, and I was hoping to find a way to power my arduino off this same power supply. From what I can find, the only 5v inputs on the arduino are the usb and the unregulated Vin. Since my power supply comes from the wall, I assume it's unregulated. Is there a way to either regulate the input wihtout losing voltage, or maybe I could solder a usb cable to wires that connect to the power supply and plug that into the usb input?


Sourav Gupta's picture


Joined: Feb 12, 2018

Replies: 399

Are you sure its 15A power supply!!!!

You can connect 5V unregulated input in the 5V input pin of the arduino.

BSwapnil's picture


Joined: Jul 04, 2020

Replies: 1

if its 5V, 15A supply it will blow your Arduino Uno. The current of 100mA is more than enough to run Uno. and max 12V input voltage.

if you are using power from the wall then I'll recommend "PCB mountable SMPS" to run UNO. It's very compact (3.5 x 2.5 x 2 cm) and easy to use 2 terminal for 230V AC and 2 terminal 5V DC output.