First, I apologize if my terminology is incorrect. I am out of my element, but trying to figure this out.

I bought a cheap PC case in Korea, and it included an RGB LED strip on the front of the case which has a cable attached via 4-pin to the strip itself, but on the other end of the cable, it is reduced to two pins. I am guessing that if I were to plug a full RGB cable (4pin to 4pin) to an RGB controller, I could control the RGB strip more precisely. However, the intention of this 2 pin seems to be simply to toggle the RGB LED strip through a series of presets, which is done via a button on the front of the case.

However, I also purchased 6 cheap Korean RGB case fans, which are also controlled by a 2 pin rgb connector. I believe if I plug them individually into the 2 pin connector which goes to the button on the case, they can each individually be cycled through preset patterns.

My goal, and my question, if I were to find a hub or splitters which allowed me to connect all of these 6 fans and LED strip to the button on the case, would I be able to cycle them through the preset patterns simultaneously via one button? I believe they all have some memory system which allows them to remember which part of the cycle they left off on when the system is powered down, so I would need to make sure they are all synchronized before connecting them to each other, but if this would work, where would I be able to purchase a 2-pin RGB hub/splitter?

I believe the answer is more of an electronics one than RGB specific, as the switch is probably sending a very simple message to trigger the RGB LED systems to move onto the next pattern in the cycle rather than sending specific RGB data.

Thank you for your help.

  • \$\begingroup\$ Researching the electronics of RGB cables more, it seems that there is a 12v anode, and three individual cathodes for each color. Each color shares the anode. This would mean that the 2 pin is just the anode and a single cathode (which appears to be green based on what I found online). This means that if I were to use a standard RGB hub, but only use the first two pins, I could use it as a hub for the cycles of the entire system. I hope this is correct! \$\endgroup\$ – Dan White Nov 23 '19 at 5:48
  • \$\begingroup\$ the cable may have some electronics built in \$\endgroup\$ – jsotola Nov 23 '19 at 6:43
  • \$\begingroup\$ it is difficult to guess what you actually have .... do you have any links to the fans or to the pc case? \$\endgroup\$ – jsotola Nov 23 '19 at 6:45
  • \$\begingroup\$ youtube.com/watch?v=BRWxLnN7JRM&feature=emb_title This is a video about the fans. It says in the video that they can be hooked up via 2 pin connector to the case reset button, which is interesting \$\endgroup\$ – Dan White Nov 23 '19 at 15:12
  • \$\begingroup\$ drive.google.com/file/d/1eWotXQNr__NsQwx3TaNw_VfsekGE0qZU/… This is a picture of the connection between the RGB LED strip on the front of the case(left) and the "LED" button on on the outside of the case (right). If the the fans and RGB LED strip both use the same function, then the LED button does nothing more than a reset button. \$\endgroup\$ – Dan White Nov 23 '19 at 15:19

The RGB 2pin LEDs can be programmed to sequence thru 1 of 8 colours using a power-off glitch as small as 1 us. Thus they may all be synchronized but need a number of pulses to achieve a steady colour.

I don’t know the sequence but I suspect combinations of 1 , 2 and all 3 LEDs to make up these colors.

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  • \$\begingroup\$ This may answer everything. If I use a standard rgb hub and plug the two pin female ends on the fans and the led strip and to the case switch, would the case switch trigger the next in the sequence simultaneously? \$\endgroup\$ – Dan White Nov 23 '19 at 9:45
  • \$\begingroup\$ I cannot speculate what a switch will do \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Nov 23 '19 at 9:51
  • \$\begingroup\$ According to the video about the fans, they can be hooked up to the 2 pin connector for the reset switch, which will move through the sequence. youtube.com/watch?v=BRWxLnN7JRM&feature=emb_title \$\endgroup\$ – Dan White Nov 23 '19 at 15:11
  • \$\begingroup\$ That's a clever way to use a storage cap and some glitch detection to use for a sequencer function \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Nov 23 '19 at 16:45

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