LED Stripe WS2811


I intent to controll a WS2811 5V LED Stripe (3 Wires) which needs 3A. So I can't simply power up my Arduino with the computer USB, as this port only supplies 500mA.

My question is now, can I power up the LEDs with an external power supply, and my arduino with the USB port, and still control these LEDs or does the GND of the external power supply and the USB need to be connected together ?

The USB port is needed to control the LEDs with the PC.

Can I damage my USB Port if I connect both GND together ?

Always connect the GNDs! A single wire can't carry a signal, it always need a reference. So external 5V to strip, usb power to Arduino en connect the ground together :slight_smile: