Hallo, I've build a project that set on certain moments different led strips to on and of, by setting digital ports to high and low. The led strips are powered via Vin (12v). When i don't connect the USB it looks like all leds ar glowing minimal. When i connect the Arduino to the computer it works …

Arduino Nano acting strainge when disconnecting from PC

Topic		Replies	Views
Arduino Nano USB connection with external power IDE 1.x	7	5679	May 5, 2021
Addressable LED strips and power supplies General Electronics	4	1348	May 6, 2021
Arduino 12V und USB betrieb Deutsch	7	6870	May 6, 2021
Arduino Nano DC Option 3rd Party Boards	19	23318	May 6, 2021
Arduino Nano and WS2812B powering connections LEDs and Multiplexing	3	6443	May 6, 2021