I am incriminating and decrementing brightness with a hue of 128 and noticing something

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1

I am incriminating and decrementing brightness with a hue of 128 and noticing something I haven’t in the past.
using:
fill_solid(leds,NUM_LEDS, CHSV( hueVal, satVal, brightVal));
FastLED.show();

values 0 - 16 are off and values 16 - 35 are just a low green. Value 36 is when a touch of blue is added.

Is there a way around this so 0 is off and 1 has an ultra low brightness of blue and green?

2

I changed the code so when 36 or below turns straight to 0 but I would prefer to use those values.

3

If you want to still code using an input range of 0-255, but have the output be either zero or 36-255, this might work:

//input is 0-255
brightVal = map(input,0,255,35,255);
if (brightVal == 35) { brightVal = 0; }

4

Is http://FastLED.setBrightness set to 255?

5

Marc, that is a good idea. I don’t know if all of the colors that might be chosen by the user will work with the brightVal<=25 being 0 though. They might and I will test all of the hues out if I don’t find another way.

Jason, FastLED.setBrightness was not used when I made the post. I tried it out and it looked the same.

I am looking at the scaling functions and think I might want to use scale8_video (uint8_t i, fract8 scale) until the last cycle set brightness to 0 for dimming.

It looks fine the way I have it now but I think there must be a way to make it look more smooth.

setting FastLED.setBrightness to 255 creates the dithering feature right? It did clean up some of the noticeable pwm glitch type stuff but a good amount of the low values are green with no blue.

thanks for your responses guys

6

Try this test @Rex_Heck . In the fill_solid hard code the brightVal to 255. Then replace the show() with this and see what it looks like:

FastLED.setBrightness(255);
FastLED.show();
FastLED.delay(1000);
FastLED.setBrightness(36);
FastLED.show();
FastLED.delay(1000);
FastLED.setBrightness(30);
FastLED.show();
FastLED.delay(1000);
FastLED.setBrightness(15);
FastLED.show();
FastLED.delay(1000);

Also, you haven’t manually disabled dithering have you?
FastLED.setDither( 0 )

7

I have not disabled dithering, it looked like adding FastLED.setBrightness in the constructor did help smooth things out but that may have been hopeful imagination.

I can only jump into the lighting element of the program for a millisecond or so. I will write that in a similar way for my application later today.