Arduino UNO power supply via 3S LiPo

Official Hardware UNO Family UNO R3
1

Hi everyone,
I'm currently working on a quadrotor project using Arduino UNO R3 board as a flight controller, to do so, I'm using a 11.1V 3S LiPo battery for my drone and I'd like to use a LM2596 step down module to supply my board via this battery, so my question is : Should I connect the LM2596 output to V in port or the DC Power Jack/USB port?

2

If you can use the DC Power Jack you don;t need the LM2596, the jack already has one.

3

Can you post an annotated schematic showing what you are going to connect to the UNO and to which pins. Show all external hardware and power sources.

4

Set the buck to 9V and connect to either Vin or the barrel jack.

5

What is the step down module's output voltage?

6

Is it possible to connect the DC power jack to the step down output by regulating the output at 5V?

7

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I'm using this Joop Brokking's schematic but I just want to add a LM2596 between LiPo and the Arduino Board in order to keep the board safe from eventual overheating or overvoltage and tht'a why I asked if I should use the Vin or 5V port to supply the board

8

Thanks, are both case safe for the Arduino board? :thinking:

9

Normally, the output is adjustable (from 1.25V to 35V) but I just want to know which voltage value is safe for the arduino board and to which port shoould I connect the step down's output

10

I would just connect the 11.1V to the jack, here is the spec
Screenshot 2025-09-04 at 13.26.29

11

Yes