odkaz pro barvy: https://www.w3schools.com/colors/colors_rgb.asp

 

Schéma:

 

https://www.tinkercad.com/things/5OeQokDZRpw-mcs-rgbled

 

Kód:

int redPin= 2;
int greenPin = 4;
int bluePin = 3;

// bila (255,255,255)
// zluta (255,255,0)
// fialova (255,0,255)
// modrozelena (0,255,255)

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop() {
  analogWrite(redPin, 255);
  analogWrite(greenPin, 255);
  analogWrite(bluePin, 255);
}