//Power LED on pin 4
//Fault LED on pin 13
//relay module on pin 7
//voltage sensor on pin 12


int sensorState = 0;

void setup() {
  Serial.begin(9600);
  Serial.println();
  pinMode(7, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(12, INPUT);
  pinMode(13, OUTPUT);
}

void loop() {
startloop:
Serial.println("Rebooting");
for (int i = 0; i <= 10; i++) {
  digitalWrite(4, HIGH);
  delay(500);  
  digitalWrite(4, LOW);
  delay(500);  

}
  digitalWrite(4, HIGH);
  digitalWrite(7, HIGH);
  delay(500);  
  digitalWrite(7, LOW);
  delay(100); 
  digitalWrite(4, HIGH);
  delay(2000); 
  //exit(0);
  
  monitorloop:
  sensorState = digitalRead(12);
  if (sensorState == LOW) {
  digitalWrite(13, HIGH);
  Serial.println("Fault detected");
  delay(50);
  delay(5000);
  goto startloop;
  } else {
  digitalWrite(13, LOW);
  Serial.println("System OK");
  delay(50);
  delay(5000);
  goto monitorloop;
  }
}