Does the 5V pin on the arduino have a limit to how many amps it can supply or not? I know that the 3.3V pin outlets 50mA DC Current, so wondered if the 5V pin had a max. Im trying to power 2x 1M adressable LED Strips, and they need around 8A to my workings, so I wondered if I supplied the arduino with lets say 5-12V ( Recommended ) at 8A would it outlet 5V 8A on the 5V pin? thanks!
Yes it is limited. I don't remember the limit right off the top of my head but it is way way way less than the 8A you mention. You'll need to supply a separate voltage supply and switch with a transistor for that. I think that is something that has been covered over and over all over Arduino-land.
The limit is what your regulator can deliver (if it's an AMS1117 that'd be 1A) without overheating (which depends on the input voltage - in case of a 12V input you're down to around 200 mA).
It's actually very simple. For anything that needs significant power, use a separate power supply. That'd be anything more than sensors and a few LEDs or a small LCD display.