Trying to convert hsb to rgb or set neopixel with hsb.

StaticFX · June 18, 2019, 11:16pm

Hey,

im programming atm a little esp8266 so it can work with alexa.

With the speech command, change color to, i get in my console 3 diffrent variables.

if i say green here are the variables:

HUE: 120
Saturation: 1
Brightness: 1

So actually im getting normal variables. But how can i convert them to rgb. googelt it but didn`t find an answer yet. The Sat and Brightness are easy to but in percent with *100. But then its not possible for me to set the color or convert them to rbg. im using adafruit neopixel to do it.

Sorry for my bad english
I hope somebody can help me

system · June 19, 2019, 9:52pm

I hope somebody can help me

From one data point, not really.

If we knew what you got when you said blue, green, yellow, and purple, maybe.

PieterP · June 19, 2019, 11:37pm

github.com

adafruit/Adafruit_NeoPixel/blob/8c7e19e60c383571ef70dfebe7c375995ff0a4a7/Adafruit_NeoPixel.cpp#L2222


      
            @return  Packed 32-bit RGB with the most significant byte set to 0 -- the

                     white element of WRGB pixels is NOT utilized. Result is linearly

                     but not perceptually correct, so you may want to pass the result

                     through the gamma32() function (or your own gamma-correction

                     operation) else colors may appear washed out. This is not done

                     automatically by this function because coders may desire a more

                     refined gamma-correction function than the simplified

                     one-size-fits-all operation of gamma32(). Diffusing the LEDs also

                     really seems to help when using low-saturation colors.

          */

          uint32_t Adafruit_NeoPixel::ColorHSV(uint16_t hue, uint8_t sat, uint8_t val) {

          

            uint8_t r, g, b;

          

            // Remap 0-65535 to 0-1529. Pure red is CENTERED on the 64K rollover;

            // 0 is not the start of pure red, but the midpoint...a few values above

            // zero and a few below 65536 all yield pure red (similarly, 32768 is the

            // midpoint, not start, of pure cyan). The 8-bit RGB hexcone (256 values

            // each for red, green, blue) really only allows for 1530 distinct hues

            // (not 1536, more on that below), but the full unsigned 16-bit type was

            // chosen for hue so that one's code can easily handle a contiguous color

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Trying to convert hsb to rgb or set neopixel with hsb.

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