int red =3;
int blue=4;
int green=5;
void setup()
{
  pinMode(red , OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(green , OUTPUT);

}
void loop()
{
  digitalWrite(red , LOW);     // red
  digitalWrite(green , HIGH);
  digitalWrite(blue, HIGH);
  delay(1000);
  digitalWrite(red, HIGH); // green
  digitalWrite(green,LOW);
  digitalWrite(blue,HIGH);
  delay(1000);
  digitalWrite(red, HIGH);      // blue
  digitalWrite(green, HIGH);
  digitalWrite(blue, LOW);
  delay(1000);
  digitalWrite(red,HIGH);
  digitalWrite(green, LOW); // cyan color
  digitalWrite(blue , LOW); // g+b
  delay(1000);
  digitalWrite(red,LOW);//r+g
  digitalWrite(green, LOW); // yellow
  digitalWrite(blue, HIGH);
  delay(1000);
  digitalWrite(red, LOW);
  digitalWrite(green , LOW); // white
  digitalWrite(blue,LOW);
  delay(1000);

}