I bought a RGBWW bulb, CB2L board, only 4 PWM... how do i configure that module?

Question

So I bought a cheap light bulb but it said it had RGBW but it advertised it had warm white and cold white, I opened the bulb and it only has RGB and warm white, I assume the cold white was emulated by the RGB LEDs and a little bit of the warm white, but how do I go about and do this emulation?

I already changed the firmware to OpenBK and the module is:

P8	White Warm
P7	Blue
P6	Red
P26	Green

p.kaczmarek2 · Accepted Answer

Hello, I will need to add a mechanism for that, would you be able to check if it works correctly for you later?

p.kaczmarek2 · Accepted Answer

Update software, enable this flag:

The color order is RGBCW. R = 0, G = 1, B = 2, C = 3, W = 4
Make sure your PWMs has channels 0, 1, 2 and 4 (not channel 3, Cool is emulated).

The device should try to emulate Cool(Cold) White with RGB, example:

Can you check and show how it looks on your device? Currently, it just takes the Cool channel value and puts in RGB channels (so R, G and B has the same value as cool)

p.kaczmarek2 · Accepted Answer

Generator didn't expect 4 PWMs. Maybe try that: Code: YAMLLog in, to see the code

rojoricardo · Answer

Of course, I can put it to the test Added after 49 :Of course, I can put it to the test, just tell me how to do it, my bulb is hooked up and ready to go.

rojoricardo · Answer

These next images are when full Warm White: These are for when going up from warm to cool (I had to lower the dimmer in order to appreciate the LEDs, also in the picture it looks bluer than it actually is) And these images are when at full Cool White (at full cool white the LEDs look bluish but not as much as it shows in the pictures)

p.kaczmarek2 · Answer

Do you think it's correct now?
If you want cool white to be emulated with a certain combination of RGB (not 1:1:1, but something else), maybe using a luminance algorithm, let us know. Maybe less blue or make a setting configurable?

rojoricardo · Answer

Houston we have another problem, now that you fixed the 4 PWM issue and emulated the Cold white. When I go into the Home Assistant configuration button, and take a look at the .yaml text, it is like it created 3 different lights:

mqtt:
  light:
  - unique_id: "Foco_OpenBK_test_01_light_0"
    name: "Foco_OpenBK_test_01 0"
    state_topic: "OpenBK_Foco_test_01/0/get"
    command_topic: "OpenBK_Foco_test_01/0/set"
    brightness_command_topic: "OpenBK_Foco_test_01/0/set"
    on_command_type: "brightness"
    brightness_scale: 99
    qos: 1
    payload_on: 99
    payload_off: 0
    retain: true
    optimistic: true
    availability:
      - topic: "OpenBK_Foco_test_01/connected"
  - unique_id: "Foco_OpenBK_test_01_light_1"
    name: "Foco_OpenBK_test_01 1"
    state_topic: "OpenBK_Foco_test_01/1/get"
    command_topic: "OpenBK_Foco_test_01/1/set"
    brightness_command_topic: "OpenBK_Foco_test_01/1/set"
    on_command_type: "brightness"
    brightness_scale: 99
    qos: 1
    payload_on: 99
    payload_off: 0
    retain: true
    optimistic: true
    availability:
      - topic: "OpenBK_Foco_test_01/connected"
  - unique_id: "Foco_OpenBK_test_01_light_2"
    name: "Foco_OpenBK_test_01 2"
    state_topic: "OpenBK_Foco_test_01/2/get"
    command_topic: "OpenBK_Foco_test_01/2/set"
    brightness_command_topic: "OpenBK_Foco_test_01/2/set"
    on_command_type: "brightness"
    brightness_scale: 99
    qos: 1
    payload_on: 99
    payload_off: 0
    retain: true
    optimistic: true
    availability:
      - topic: "OpenBK_Foco_test_01/connected"
  - unique_id: "Foco_OpenBK_test_01_light_4"
    name: "Foco_OpenBK_test_01 4"
    state_topic: "OpenBK_Foco_test_01/4/get"
    command_topic: "OpenBK_Foco_test_01/4/set"
    brightness_command_topic: "OpenBK_Foco_test_01/4/set"
    on_command_type: "brightness"
    brightness_scale: 99
    qos: 1
    payload_on: 99
    payload_off: 0
    retain: true
    optimistic: true
    availability:
      - topic: "OpenBK_Foco_test_01/connected"

rojoricardo · Answer

That YAML did work, just changed the names and MQTT paths

rojoricardo · Answer

I was wondering about that, because I noticed that when trying to send color names from Home Assistant, for example, it doesn't get the color quite right, for example dark orange looks green, probably because green yields more light or shines with more intensity than red at the same range??? IDK...

p.kaczmarek2 · Answer

Which version? One of the contributors added exponential brightness recently, but I am not sure if it can help in your case

rojoricardo · Answer

I used gamma Correction and it worked better also supplied the solution

p.kaczmarek2 · Answer

Don't forget to link Gamme correction docs:
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/led_gamma_control.md



	led_gamma_control () - led_gammaCtrl command handler, usage: led_gammaCtrl <sub-command> [parameter(s)]
		sub-commands:
			cal [f f f]   - set RGB calibration values from color-picker or parameters
			gamma <f>     - LED gamma correction, range 1.0-3.0: 1.0 = gamma off, default = 2.2
			brtMinRGB <f> - minimum brightness in % for RGB mode, range 0.0-10.0%, default = 0.1
			brtMinCW <f>  - minimum brightness in % for CW mode, range 0.0-10.0%, default = 0.1
			list          - list settings (and enable additional messages)
		Results will be displayed as Logs Info:CFG: messages (may want to turn off MAIN, MQTT and GEN to silence other messages)
		Any sub-command will enable channel messages containing output values in %

		Calibration sequence:
			1: clear current calibration values (= 1.0, default) by one of these methods:
			   a: set color-picker to "white", i.e. #FFFFFF and enter command "led_gammaCtrl cal"
			   b: or set values directly with command "led_gammaCtrl cal 1.0 1.0 1.0"
			2: adjust RGB LEDs to emit white light of preferred temperature and brightness
			3: enter command "led_gammaCtrl cal" - if successful the settings will be listed and stored in flash

		Use command "gamma <f>" to set gamma value. Range 1.0-3.0: 1.0 = gamma off, default is 2.2.
		  To fully disable gamma correction you may also want to set brtMinX to 0.0.
		Use commands "brtMinRGB <f>" and "brtMinCW <f>" to set minimum brightness for RGB and CW LEDs.
			Valid range is 0.0-10.0% of full range (including brightness 0). "channel messages" is useful in finding suitable
			range: adjust brightness to desired minimum level and use the highest channel % value as brtMinX parameter.
			Channels 0-2 is RGB, channels 3-4 is CW
		Use command "list" to view gamma and calibration settings.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.

[Solved] I bought a RGBWW bulb, CB2L board, only 4 PWM... how do i configure that module?

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Post #12

Post #13

Topic summary