// https://forum.arduino.cc/t/rookie-need-assistance-learning/1286072/10

/*
  I want it to count to 120. At every ten count turn on an led for two counts
  then off again and repeat the cycle until it gets to 120 then turn off a 
  relay to the power supply that shuts off the whole thing. 
*/

byte ledPin = 2, relayPin = 3, powerPin = 4;
byte countTen = 10, countFinal = 120, twoCounter, finalCounter;
unsigned long interval = 1000; // ms between counts

void setup() {
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(powerPin, OUTPUT);
  digitalWrite(powerPin, HIGH);

  while (finalCounter < countFinal) {
    if ((finalCounter > 2) && (!(finalCounter % countTen) || ((finalCounter % countTen) == 1))) {
      digitalWrite(relayPin, HIGH);
      digitalWrite(ledPin, HIGH);
    } else {
      digitalWrite(relayPin, LOW);
      digitalWrite(ledPin, LOW);
    }

    // Serial monitor output formating
    if (finalCounter < 100) Serial.print(" ");
    if (finalCounter < 10) Serial.print(" ");
    Serial.print(finalCounter);
    Serial.print(" ");
    if (!(finalCounter % 10)) Serial.println();
    finalCounter++;
    delay(interval);
  }

  // turn everything off at count 120
  digitalWrite(ledPin, LOW);
  digitalWrite(relayPin, LOW);
  digitalWrite(powerPin, LOW);
  Serial.println("120");
}

void loop() {}