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

ieee488 April 2, 2018, 4:27pm 3

You don't have current limiting resistors for your LED.

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