int powerUp = 2;   //RED PB
#define motorCtrl 3   //Red LED
#define lightCtrl 4   //Green LED
#define doorCtrl 5    //Blue LED
#define buzzerCtrl 6  //Yellow LED
#define punchCtrl 7   //Blue PB
#define punchMotor 8

int latchState = LOW;
int currentState = LOW;
int lastState = LOW;

int punch = LOW;


void setup()
{
  //defining pinmodes of pins
  pinMode(powerUp, INPUT);      //main control switch
  pinMode(motorCtrl, OUTPUT);   //motor control circuit ouput
  pinMode(lightCtrl, OUTPUT);   //workarea lighting
  pinMode(doorCtrl, OUTPUT);    //door interlock control
  pinMode(buzzerCtrl, OUTPUT);  //buzzer to indicate ready state of punching m/c
  pinMode(punchCtrl, INPUT);    //PB to operate punching m/c
  pinMode(punchMotor, OUTPUT);  //Light blue LED to indicate the punching motor
  //initializing the serial monitor @ 9600 baudrate
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(powerUp), power, CHANGE);

}

void loop() {
  // put your main code here, to run repeatedly:

  //switching ON devices when PB/latch State is ON
  if (latchState == HIGH)
  {
    digitalWrite(lightCtrl, HIGH);  //green
    delay(150);
    digitalWrite(doorCtrl, HIGH);   //blue
    delay(150);
    digitalWrite(motorCtrl, HIGH);  //red
    delay(150);
    digitalWrite(buzzerCtrl, HIGH); //yellow
    punch = digitalRead(punchCtrl);
    if (punch == HIGH)
    {
      digitalWrite(punchMotor, HIGH);
      delay(5000);
    }
    else
    {
      digitalWrite(punchMotor, LOW);
    }
  }
  //switching OFF devices when PB/latch State is OFF
  else if (latchState == LOW)
  {
    digitalWrite(punchMotor, LOW);
    digitalWrite(buzzerCtrl, LOW);  //yellow
    delay(300);
    digitalWrite(motorCtrl, LOW);   //red
    delay(300);
    digitalWrite(doorCtrl, LOW);    //blue
    delay(300);
    digitalWrite(lightCtrl, LOW);   //green
  }

  Serial.print("latch = ");
  Serial.println(latchState);
  Serial.print("punch = ");
  Serial.println(punch);

}

void power(void)
{
  latchState = !latchState;
}