#define red 6
#define green 5
#define blue 3

void color(int r,int g,int b){
analogWrite(red,r);
analogWrite(green,g);
analogWrite(blue,b);
delay(1000);
}
void setup() {
  // put your setup code here, to run once:
pinMode(red, OUTPUT);
pinMode(green, OUTPUT);
pinMode(blue, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
color(0,255,255);
color(255,0,255);
color(255,255,0);
color(0,0,0);
}