RGB colors on pins 11, 10 and 9, on an Arduino Uno

// An RGB LED on pins 11, 10 and 9: seven colors, one after another.
//
//   pin 11 -> 220 ohm -> red leg      pin 10 -> 220 ohm -> green leg
//   pin 9  -> 220 ohm -> blue leg     the long leg (common cathode) -> GND
//
// analogWrite() sets each color from 0 to 255. Mixing them makes the rest:
// red and green make yellow, green and blue cyan, red and blue magenta.

const int RED_PIN = 11;
const int GREEN_PIN = 10;
const int BLUE_PIN = 9;

struct Color {
  const char *name;
  uint8_t r, g, b;
};

const Color COLORS[] = {
    {"red", 255, 0, 0},     {"green", 0, 255, 0},   {"blue", 0, 0, 255},     {"yellow", 255, 255, 0},
    {"cyan", 0, 255, 255},  {"magenta", 255, 0, 255}, {"white", 255, 255, 255},
};

void setup() {
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
  Serial.begin(9600);
  Serial.println("Mokxi Uno: RGB LED on pins 11, 10 and 9");
}

void loop() {
  for (const Color &c : COLORS) {
    analogWrite(RED_PIN, c.r);
    analogWrite(GREEN_PIN, c.g);
    analogWrite(BLUE_PIN, c.b);
    Serial.println(c.name);
    delay(1000);
  }
}