Hello @Oliver@DSunY I want more control of my Shannon S40+ using reefpi and looked at the PCB inside and noticed there are pinouts to control the lights. Can you tell me what kind of signal that I need to use to control these individual channels? I was able to use my ohm meter to find out that the voltage increased from 0 to 5v as I increased the light intensity but I want to make sure it is a dc voltage is needed and not something else.