//Stopwatch init.
const int oprTimePin = 13; //Welding Time/Runtime
unsigned long oprTime = 0;
unsigned long lastMillis = 0;
unsigned long detik = 0;
unsigned long menit = 0;

//Mesin Status init.
int mesinStatus = 0;

void setup() {

  Serial.begin(115200);

  pinMode(oprTimePin, INPUT_PULLUP);
}

void loop() {

  unsigned long currentMillis = millis();

  if (digitalRead(oprTimePin) == LOW) {
    oprTime += currentMillis - lastMillis;
    mesinStatus = 1;
  } else {
    mesinStatus = 0;
  }

  lastMillis = currentMillis;

  detik = (oprTime / 1000) % 60;
  menit = (oprTime / (1000 * 60));

  Serial.print("Waktu: ");
  Serial.print(menit);
  Serial.print(":");
  Serial.print(detik);
  Serial.print("  ");
  Serial.print("Mesin status:");
  Serial.print(mesinStatus);
  Serial.print("  ");
  Serial.println(oprTime);

  delay(1000);

}