// constants won't change. They're used here to set pin numbers:
const int IntanTTL = 12;         // the number of the pushbutton pin
const int relayTTL = 10;         // the number of the pushbutton pin
boolean enableLoop = true;

void setup() {
  // initialize the LED pin as an output:
  pinMode(IntanTTL, OUTPUT);
  pinMode(relayTTL, OUTPUT);
}

void loop() {
  if (enableLoop == true) {
   for (int i = 0; i < 60; i++) {
    digitalWrite(IntanTTL, LOW);
    digitalWrite(relayTTL, HIGH); 
    delay(300000);
    digitalWrite(IntanTTL, HIGH);
    digitalWrite(relayTTL, LOW); 
    delay(300000);
    if (i == 19) {
      enableLoop = false;
    }
  } 
  }
  digitalWrite(IntanTTL, LOW);
  digitalWrite(relayTTL, HIGH); 
}