Changing color with color code

[tromphakvoort]

Hi, this isn't probably the place to ask this question but I don't really know where else to ask it.
When I request the data from my RGBW lamp it returns dps 20-26 with 24 containing the color, brightness and saturation in colour mode.
I can't seem to understand how this code is build. I've read a lot of issues on GitHub with possible explanations but none have completely worked for me.

My Bulb returns the following data:

dps: {
    '20': true,
    '21': 'colour',
    '22': 1000,
    '23': 1000,
    '24': '015303e803e8',
    '25': '000e0d0000000000000000c80000',
    '26': 0
  }

From what i can find on the internet the color is in HSV separating the values with a 0.

What i can't seem to figure out is why my color code contains letters and what they mean.

Could anyone help me out with this or point me in the right direction?

[kueblc]

From what i can find on the internet the color is in HSV separating the values with a 0.

Not quite, the zero is not a separator.

What i can't seem to figure out is why my color code contains letters and what they mean.

This is a hexadecimal representation of color. Two hexadecimal digits represent one byte, so the challenge is figuring out which byte controls which channel.

I would send the bulb values with one byte set at a time and observe what it does, ie
ff0000000000
00ff00000000
0000ff000000
... and so on.

[duncte123]

I ran into the same issue, from my findings it seems that the 3e803e8 dictates the brightness and the colour/white sliders. The first 5 bits are for the colour.

[f00stx]

The colour code can be (almost) directly decoded to an HSV color value, so if you know what color you'd like, you can also encode the correct color value (the resulting string is just the 3 segments of an HSV value, as hex, and then zero-padded):

function hsv2tuya(hsv) {
    tuyaH = hsv['h'].toString(16).padStart(4, '0')
    tuyaS = (10 * hsv['s']).toString(16).padStart(4, '0')
    tuyaV = (10 * hsv['v']).toString(16).padStart(4, '0')

    return tuyaH + tuyaS + tuyaV
}

// Bright green, #00FF00
hsv = {
    h: 120,
    s: 100,
    v: 100,
}

console.log(hsv2tuya(hsv)) // = 007803e803e8

Setting dps['24'] to the resulting value (007803e803e8) does the trick on my device (an LED strip in the "Arlec GridConnect" family).

[tromphakvoort]

The colour code can be (almost) directly decoded to an HSV color value, so if you know what color you'd like, you can also encode the correct color value (the resulting string is just the 3 segments of an HSV value, as hex, and then zero-padded):

function hsv2tuya(hsv) {
    tuyaH = hsv['h'].toString(16).padStart(4, '0')
    tuyaS = (10 * hsv['s']).toString(16).padStart(4, '0')
    tuyaV = (10 * hsv['v']).toString(16).padStart(4, '0')

    return tuyaH + tuyaS + tuyaV
}

// Bright green, #00FF00
hsv = {
    h: 120,
    s: 100,
    v: 100,
}

console.log(hsv2tuya(hsv)) // = 007803e803e8

Setting dps['24'] to the resulting value (007803e803e8) does the trick on my device (an LED strip in the "Arlec GridConnect" family).

Did this in javascript but got a different result. My result is 0078640640 I'm new to binary and hexadecimal so I dont completely understand how you got your result and why mine is different.

This is the code I used:

function hsv2tuya(hsv) {
  tuyaH = hsv["h"].toString(16).padStart(4, "0");
  tuyaS = 10 * hsv["s"].toString(16).padStart(4, "0");
  tuyaV = 10 * hsv["v"].toString(16).padStart(4, "0");

  return tuyaH + tuyaS + tuyaV;
}

hsv = {
  h: 120,
  s: 100,
  v: 100
};

console.log(hsv2tuya(hsv));

[codetheweb]

@tromphakvoort looks like you're missing the required parenthesis, i.e you're doing tuyaS = 10 * hsv["s"].toString(16).padStart(4, "0") instead of tuyaS = (10 * hsv['s']).toString(16).padStart(4, '0').

Converting to a discussion.