Sorry if this is a stupid question, but I notice that the wiring of my first proper project means that the arduino uno r3 and my 120 neopixel WS2812B LED strip share a common ground but not the +ve. My power supply unit (psu) is 5v 10A for the LEDs and the board is USB powered. My question is, why…

Sharing a power supply between arduino and led strip?

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