Hi, I am not an electronics expert, but I want to make a LIGHTSABER and my idea is to make the blade turn on gradually (not scrolling up and down but from OFF to ON gradually along 1 second maybe?)
The problem is that this lightsaber blade is going to have up to 12W of power (4A x 3v) and as long as I know, Arduino pins cannot provide more than 40mA of current, To give this amount of power through an Arduino pin I would need a transistor working arround.
But what about the gradual turn on? does it work with a transistor too? or do I need any kind of electronic component that I don't know? Some schematics would be super helpfull!
PD: I am using Arduino pro mini 3.3v (because you know, tiny space for electronics = tiny electronics) is that an issue for this project?