#define PIN_RED    23 // GPIO23
#define PIN_GREEN  22 // GPIO22
#define PIN_BLUE   21 // GPIO21

void setup() {
  pinMode(PIN_RED,   OUTPUT);
  pinMode(PIN_GREEN, OUTPUT);
  pinMode(PIN_BLUE,  OUTPUT);
  setColor(255, 0, 0);
}

void loop() {
  
}

void setColor(byte r, byte g, byte b){
  analogWrite(PIN_RED,   r);
  analogWrite(PIN_GREEN, g);
  analogWrite(PIN_BLUE,  b);  
}