LED controller in a Chinese ceiling lamp - change to Zigbee

Hardware
1

Hi

I have a Chinese LED ceiling lamp with a remote control or Bluetooth (LampSmart Pro application).
LED color options: cool, natural, warm and dimmable.
Link: https://www.aliexpress.com/item/4000919622267.html

I would like to make a modification by changing the controller to Zigbee - I would like to gain control via Home Assistant.
I will add that ESP32 with the software available on the Home Assistant community does not work, so I have already abandoned this topic.

I thought that after removing the ceiling lamp I would see CCT, but there is something completely different there - LED Remote control driver, model XX-90-130F.
All light changes are controlled via 2 pins - unfortunately I have no idea how it works.

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Does anyone know what type of controller this is?
Alternatively, does anyone know what Zigbee controller could replace it? (I assume that an additional 24V DC power supply will be required for this)

Many thanks for help.

2

FAQ on Aliexpress is always great.
200% illuminated is just “enough”.
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What kind of capabilities does it have? Is it just dimming?

1 Like
3

It has dimming options and color temperature changes - cold, natural, warm.

I created video:

Could it be that it is controlled by voltage? In the second photo we can see that the color of the diodes is different and I think that the video shows the previous color temperature being turned off before changing to a new one - unless I’m seeing it wrong?

4

Since there is no data cable, it means leds are “dumb” and all the control happens on driver. If it was voltage control, both pure warm and pure cold would be impossible.
So the only possibility is that warm and cold leds are wired at opposite polarity and that controller is switching (fast) polarity in proportion of temperature asked.

5

Interesting theory.
The label says DC, but also 50-60 Hz so that makes no sense.

6

Maybe you need both to have 200% :joy:

7

Would be easy to verify with multimeter.
Full cold>>measure voltage and observe sign, full warm>>measure voltage and observe if sign is opposite.

8

I made a video that shows how the LED driver works.

9

Ok…
So both the positive and negative voltage makes sense, but the 0 volt doesn’t.
So what happens if you set the multimeter to AC?

10

it makes perfectly sense, fast switching polarity 50% each, multimeter reads zero.

1 Like
11

All together, pwm control in fast switching opposite polarities is probably new approach, I have doubts you find zigbee controller capable doing that at the moment.

12

You’re probably right. When I look at the diodes, for the “natural” temperature, the cold and warm diodes are on at the same time.

If there is no similar solution in zigbee then I will probably decide to choose warm lighting and I will connect the cables appropriately to obtain this color temperature of the light.

13

That’s ok. Think of it just normal led strip for warm Led. Like cold didn’t exist.

14

Also update your setup here. It’s not the first case with these drivers here. Personally never had one on my hands, just following common sense…