While practicing in Tinkercad, I stumbled on a problem that I'm not educated enough to solve so I have to ask here.
The goal here is to have the LED powered by the power supply, and Arduino powered on USB, and the pushbutton acts on Mosfet's gate that flashes the LED. When I run the simulation, it works as intended but to be honest the massive ground wiring on Mosfet source seems messy, and when I run the sim without touching the pushbutton, the power supply displays 319 mV and 1A draw - where? I can't figure the mistake, but I sort of think it might have something to do with the way I grounded it? Any advice welcome :)