Arduino Forum
Multiple power sources
Other Hardware
Motors, Mechanics, Power and CNC
system
February 28, 2012, 9:13am
1
Is it safe to connect an Uno via USB and a 12V adaptor simultaneously?
kf2qd
February 28, 2012, 4:19pm
2
Yep.
Related topics
Topic
Replies
Views
Activity
External power using Vin when USB is used to upload firmware
UNO R4 WiFi
23
246
April 22, 2026
Uno R3, 5v in and USB
UNO R3
20
313
February 13, 2026
Powering an Uno
General Guidance
22
865
January 30, 2023
Why does my Arduino not work correctly when I disconnect the USB?
Programming
24
351
September 20, 2025
Mein Projekt mit Strom versorgen. Nur wie am Besten?
Deutsch
13
1455
December 27, 2023