umm.. The questions came up while working.. First, look at this site that is simmilar with my project. https://arduino.stackexchange.com/questions/21016/how-to-connect-a-12v-power-supply-to-an-rgb-led-strip-receiving-rgb-values-via-a
Just say power supply is 3A 3V and using pwm, upper one is 255 and the others are 0, does red led take 3A3V or 1A 1V? In my project, it was 1A1V but I don't know why. Does the 0 mosefts are not blocking current? Is it flow to ground?
And I want to using both technology (like relay one and other).. Could you give me some help please :(