R1842 patch LED: use HSV color space to calcuate LED color

Now LED's color is not accurate. For example, a Red LED will displayed as green if there's no currect.

By using HSV color, we keep the hue and only change the intensity.For example, red will always be red, just darked or lighter.

Patch cleaned.

Demo of Red LED (old vs new)

Led colors are a bit tricky.
For example what happens when the led is slightly overloaded?
It should increase it's brightness, but we are already at 100%.

In the picture below (with HSV patch) you see that 100 Ω and 200 Ω have the same brightness.




Also different colors have different brightness at same current (leds at the bottom with HSV patch).
In my previous implementation I tried to get a more uniform brightness, but colors got off the rails (leds at the top).





I did some changes based in your solution (Rev 1851), but addressing some issues:
- Fixed the wrong color at very low brightness.
- Kept some brightness correction but keeping closer to your colors:



- Kept some overbright at slight overload (100 Ω led below).
- Added some color to the background to indicate slight overload (100 Ω led below).
- Kept the flashing warnings with medium and extreme overload (75 Ω & 10 Ω below).

Great!

arcachofo wrote:Led colors are a bit tricky.
For example what happens when the led is slightly overloaded?
It should increase it's brightness, but we are already at 100%.

In the picture below (with HSV patch) you see that 100 Ω and 200 Ω have the same brightness.




Also different colors have different brightness at same current (leds at the bottom with HSV patch).
In my previous implementation I tried to get a more uniform brightness, but colors got off the rails (leds at the top).





I did some changes based in your solution (Rev 1851), but addressing some issues:
- Fixed the wrong color at very low brightness.
- Kept some brightness correction but keeping closer to your colors:



- Kept some overbright at slight overload (100 Ω led below).
- Added some color to the background to indicate slight overload (100 Ω led below).
- Kept the flashing warnings with medium and extreme overload (75 Ω & 10 Ω below).