Raspberry Pi Pico RGB LED Color Cycle (3-Channel PWM, GP11-13)

One LED, millions of colors! 🌈 An RGB LED actually contains 3 LEDs: **red, green and blue**. Driving each with its own Pico **PWM** channel mixes the colors: red + green = yellow, green + blue = cyan, all three = white. Here the LED cycles through 8 colors. Learn **multiple PWM channels**, **defining functions** (`def renk(...)`), **RGB color mixing** (how screens and smart bulbs work), **8-bit → 16-bit conversion** (`x257` maps 0–255 to 0–65535), **common cathode vs common anode** LEDs and **st