I want to make 500-800 LEDS dance to my music and they will be RGB and I will have red as high and blue as mids and green as lows or something like that but, how do you hook all of them up running off a different power source other than the arduino, because the arduino only can handle 40 ma per PWM channel if I'm right and I'm going to be doing 16 amps per channel. Each PWM will have its color but I want to not have to have a bunch of shift resistors or something that will take a bunch of programing and will cause them to be out of sync.
So there will be red, blue, green coming each from there own PWM pin and needing them to run an infante amount of LED with the same programing as running one?
Also is it possible to have the arduino control the brightness of it but have a poteteometer control the brightest of all colours?
If this is possible I will be buying the arduino to run this but I want to know how much it's going to cost to see if the price is going to be way to much.