Powering 2 Arduino's with li-ion 18650b batteries

Official Hardware UNO Family UNO R3
1

Hello dear tinkerers,

My project includes two Arduino Uno's running 5x 28BYJ-48 steppers.

I have plenty of li-ion 18650b 3.7V 3400mah batteries.
In a series of 3 they are 11.1 Volts.

Is there a way to power two Arduino Uno's with this setup?

Kind regards,

Kieran

2

The operating voltage of Arduino Uno is 5V. If you plan to use the battery you can power the board by connecting the battery to Vin and GND.

3

Arduino will support this directly. However will waste power, which may not be ideal for battery. Arduino uses linear regulator. You may want to buy switch mode linear regulator replacement.

VR10S05 XP Power | Power Supplies - Board Mount | DigiKey

Remember to use over discharge and other protection logic.

4

They may need external drivers. I do not know how much power they draw. The signals could be more than supported by pins on Uno. See below:

28BYJ-48 Stepper Motor Pinout and specifications (pinouts.net)

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