I've got an RGB led strip I'm trying to control. It's a 12v, 4 pin strip. Pin layout seems rather odd to me as 1 pin takes 12v of power and 3 pins (that go to ground) control the colors. In other words, the LED colors are controlled by limiting outgoing voltage.
- White- +12v
- Green- Green in negative voltage
- Red - Red in negative voltage
- Blue - Blue in negative voltage
I've already made a similar setup that uses n-channel MOSFETS (or at least I think that's what they are) between the colored cables and the ground and Arduino power the MOSFET gates as necessary.
So my question is: is it possible to hook these LEDs up directly to arduino and control the negative voltage without aditional electronics?
As a slightly off topic question: Is there a specific name for elements that are controlled with negative voltages.
By the way, I'm using Arduino nano, although I don't think it is relevant at this point and I've got Mega and Uno aswell if needed.