The routine setColorHSB() was incorrect. It implemented the HSL color space and not the HSL one.

Refactored the routines so that it reflects the HSL space.
See [Wrong HSB Format](#3).

Author: pjpmarques

ChainableLED.cpp

@@ -131,23 +131,23 @@ void ChainableLED::setColorRGB(byte led, byte red, byte green, byte blue)
     sendByte(0x00);
 }
 
-void ChainableLED::setColorHSB(byte led, float hue, float saturation, float brightness)
+void ChainableLED::setColorHSL(byte led, float hue, float saturation, float lightness)
 {
     float r, g, b;
 
     constrain(hue, 0.0, 1.0);
     constrain(saturation, 0.0, 1.0);
-    constrain(brightness, 0.0, 1.0);
+    constrain(lightness, 0.0, 1.0);
 
     if(saturation == 0.0)
     {
-        r = g = b = brightness;
+        r = g = b = lightness;
     }
     else
     {
-        float q = brightness < 0.5 ? 
-            brightness * (1.0 + saturation) : brightness + saturation - brightness * saturation;
-        float p = 2.0 * brightness - q;
+        float q = lightness < 0.5 ? 
+            lightness * (1.0 + saturation) : lightness + saturation - lightness * saturation;
+        float p = 2.0 * lightness - q;
         r = hue2rgb(p, q, hue + 1.0/3.0);
         g = hue2rgb(p, q, hue);
         b = hue2rgb(p, q, hue - 1.0/3.0);

ChainableLED.h

@@ -51,7 +51,7 @@ class ChainableLED
 
     void init();
     void setColorRGB(byte led, byte red, byte green, byte blue);
-    void setColorHSB(byte led, float hue, float saturation, float brightness);
+    void setColorHSL(byte led, float hue, float saturation, float lightness);
 
 private:
     byte _clk_pin;

README.md

@@ -3,7 +3,7 @@ ChainableLED
 
 Arduino library compatible with Grove Chainable LED and the P9813 chip. It allows controlling a chain of LEDS individually. 
 
-Supports both RGB and HSB color spaces for setting the color of each individual LED.
+Supports both RGB and HSL color spaces for setting the color of each individual LED.
 
 Compatible with [Particle devices](https://www.particle.io/).
 
@@ -29,6 +29,6 @@ public:
 
   void init();
   void setColorRGB(byte led, byte red, byte green, byte blue);
-  void setColorHSB(byte led, float hue, float saturation, float brightness);
+  void setColorHSL(byte led, float hue, float saturation, float lightness);
 }
 ```

examples/CycleThroughColors/CycleThroughColors.ino

@@ -1,7 +1,7 @@
 
 /* 
  * Example of using the ChainableRGB library for controlling a Grove RGB.
- * This code cycles through all the colors in an uniform way. This is accomplished using a HSB color space. 
+ * This code cycles through all the colors in an uniform way. This is accomplished using a HSL color space. 
  */
 
 
@@ -22,7 +22,7 @@ boolean up = true;
 void loop()
 {
   for (byte i=0; i<NUM_LEDS; i++)
-    leds.setColorHSB(i, hue, 1.0, 0.5);
+    leds.setColorHSL(i, hue, 1.0, 0.5);
 
   delay(50);
 

keywords.txt

@@ -1,5 +1,5 @@
 #######################################
-# Syntax Coloring Map For Ultrasound
+# Syntax Coloring Map For ChainnableLED
 #######################################
 
 #######################################
@@ -12,7 +12,7 @@ ChainableLED	KEYWORD1
 # Methods and Functions (KEYWORD2)
 #######################################
 setColorRGB	KEYWORD2
-setColorHSB	KEYWORD2
+setColorHSL	KEYWORD2
 
 #######################################
 # Constants (LITERAL1)