I'm working on a project that is to make myself a keyboard.
Basically, the idea is a 4x16 key switch matrix with a 4x16 LED matrix.
I just want to have every single LED under control with PWN, so I work with a 328p driving TLC5940 and p-MOS and the sampling testing is pretty good.
So I'm thinking if I can make the matrix RGB and here's the problem.
my current limiting is set at 20ma, for a 4x16 matrix it's at 20x16=320ma which is pretty safe for the USB port.
But, if I make it RGB, it's like 3x20x16=960ma and it's go boom.
Of course, it happens only when all 16 ports at 100% duty and you push 16 buttons at the same time which I can say almost impossible; but I'm wondering if there's a way that I can control the matrix's peak consumption at like 450ma?
I have a 500ma fuse but I don't want it just reset that often.