void setup() {
  // put your setup code here, to run once:
   pinMode(A3, OUTPUT);  //red color
   pinMode(A2, OUTPUT);  //green color
   pinMode(A1, OUTPUT);  //blue color
}

void color_setup(int red,int green,int blue)
{
  analogWrite(A3,red);
  analogWrite(A2,green);
  analogWrite(A1,blue);
}

void loop() {
  // put your main code here, to run repeatedly:
  color_setup(0,255,255);
   delay(500);
  // color_setup(0,255,0);
  // delay(500);
  // color_setup(0,0,255);
  // delay(500);
}