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

nijmedw April 2, 2018, 4:09pm 2

In an addition i've attached the configuration as i made it.

Any suggestions?