I just wanted to confirm something with you. I have read many forum posts that discuss "how to power an Arduino with an External 5V power supply".
There are some comments that suggest to cut a USB cable and power the Arduino via the USB port. There are other comments that suggest the 5V pin - and the dangers associated with this. Plus the possibility to use a Diode from the 5V to the VIN to protect against reverse voltage.... and I think I understand each of the suggestions from other posts on this forum.
I also read that you must supply the VIN pin with 7-12V - because the onboard 5V voltage regulator needs the input to be at least 2V higher for it to work.
Now this is what I want to confirm:
I am powering a 144 Neopixel /metre LED strip with a Meanwell (NES 50-5) 5V 10A External power supply.
I wanted to power the Arduino and the LEDs with that power supply at the same time, and so I connected the power supply to the VIN pin (and also to GND), and it worked ???
After all of the information that I read, I did not expect it to work, but it did.
So, is there any danger in powering the Arduino with 5V through the VIN pin ?