I have a LED string with four different lights. The lights are in order red, green, yellow and blue and this pattern is repeated. It has a controller with a button to cycle through fading/blinking modes. All red and yellow lights form a group and all green and blue lights form a group. The lights in a group are always on at the same time and equally bright.
First (left) and second LED:
- Two wires are going from the controller to the first LED.
- Every LED is connected with two wires to the previous LED and with two wires to the next LED.
- There is a wire from the first LED that skips the other lights (I thought all other lights, but I didn't check them all, still have to check) and goes into the last LED, so three wires are going into the last LED.
I expected there to be three wires from the controller to the first LED, one for each of the groups and one common wire that is either + or -. How can two groups of lights be controlled independently with only two wires?
Based on the current answers I drew this diagram, but I'm not sure if it's right. I still have to count the LEDs to see if it is possible with the 31V output specified on the adapter.