Issues with DotStar HSV colors

[Youkai]

I'm trying to get a dotstar strip working and I'd like to use HSV because it will make shifting the hue to nearby colors and also the brightness easier than RGB. I'm having trouble though with the picking of the correct hue numbers for colors. I'm looking at the image under HSV here https://learn.adafruit.com/adafruit-dotstar-leds/arduino-library-use and trying to put in the numbers that it would expect.

10922 gave me a yellow. 21845 did not give me green, and a number around 34000 did not give me a blue/teal color. I can't figure out what numbers I should use to get the correct colors.

This my color assignment line:

Code: [Select]

uint32_t colorWave = strip.ColorHSV(21845, 255, 255);
Anybody figured this out?

[tooki]

Are you sure your LEDs use the default byte order for the colors? As stated farther down the page, the different manufacturers (or even batches) of these things don’t always use the same order for RGB, so you can set the order via a parameter. You can test what you’ve got by writing pure red, green, and blue and seeing what comes out.

P.S. You might want to try the FastLED library instead of Adafruit’s. It has much more robust HSV support, as well as specific functions for performing math on the colors (like brightness or hue). https://github.com/FastLED/FastLED/wiki/Pixel-reference#chsv

[Youkai]

OK thanks for the info. I'll check out the fastLED and also check the color order.

[Youkai]

Are you sure your LEDs use the default byte order for the colors?

Turns out I needed DOTSTAR_GBR to work correctly. Thanks.

[tooki]

Glad to help!