#define R 1
#define O 2
#define Y 3
#define G 4
#define B 5
#define I 6
#define V 7

void setup() {
  pinMode(R, OUTPUT);
  pinMode(O, OUTPUT);
  pinMode(Y, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(I, OUTPUT);
  pinMode(V, OUTPUT);
}

void loop() {
  digitalWrite(R, HIGH);
  delay(500);
  digitalWrite(O, HIGH);
  delay(500);
  digitalWrite(Y, HIGH);
  delay(500);
  digitalWrite(G, HIGH);
  delay(500);
  digitalWrite(B, HIGH);
  delay(500);
  digitalWrite(I, HIGH);
  delay(500);
  digitalWrite(V, HIGH);
  delay(500);
  
  digitalWrite(R, LOW);
  digitalWrite(O, LOW);
  digitalWrite(Y, LOW);
  digitalWrite(G, LOW);
  digitalWrite(B, LOW);
  digitalWrite(I, LOW);
  digitalWrite(V, LOW);
  delay(500);
}