//bool sw = false;
//bool x = false;
//bool state = LOW;
//bool lastState = LOW;
//bool armed = true;
//uint8_t btn_prev;
int ledState = LOW;        // the current state of the output pin
int buttonState;            // the current reading from the input pin
int lastButtonState = LOW;

unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 25;   // the debounce time; increase if the output flickers

void setup() { 

  Serial.begin (9600);

  pinMode (9,OUTPUT); // Latch relay
  pinMode (3,INPUT); //pushbutton latching
  digitalWrite(9, ledState);

  attachInterrupt(digitalPinToInterrupt(3), latchSW, RISING);
  //state = digitalRead(3);

 } 

 void loop() { 
 
 if(ledState != lastButtonState){
        // set the LED:
        if(ledState == LOW && lastButtonState == HIGH){
          Serial.println("TimeDelay 2 sec");
          delay(2000);
          Serial.println("OFF");
          digitalWrite(9, LOW);
          //lastButtonState = LOW;
        }else if(ledState == HIGH && lastButtonState == LOW){
          Serial.println("ON");
          digitalWrite(9, HIGH);
          //lastButtonState = HIGH;
        }
        
  } 

    //delay(500);
 }


 void latchSW(){
  // read the state of the switch into a local variable:
  int reading = digitalRead(3);

  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the LED if the new button state is HIGH
      if (buttonState == HIGH) {
        ledState = !ledState;
        
      }
    }
  }
  
  

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;
 
 }

/*
  if (btn == LOW && btn_prev == HIGH)
    {
    //if(latchstate == HIGH){
      //LED on pin 9 is Push ON, Push OFF
      digitalWrite(9,HIGH); 
      Serial.println("HIGH");
    }
    else{
      digitalWrite(9,LOW); 
      Serial.println("LOW");
      }
    //}

    btn_prev = digitalRead(3);

    uint8_t state = digitalRead(3);

  if(state && !lastState){
    lastState = true;
    x!=x;
    if(x){
      // code if turned on
      digitalWrite(9,HIGH); 
      Serial.println("HIGH");
    }else{
      // code if turned off
      delay(1000);
      digitalWrite(9,LOW); 
      Serial.println("LOW");
    }
  }else if(!state){
    lastState = false;
  }


if (armed && digitalRead(3) == PRESSED){
      armed = false;
      ...
   }

buttonState = digitalRead(3);

  if (buttonState == HIGH) 
  {
    if(latchState == LOW){
      //LED on pin 9 is Push ON, Push OFF
      digitalWrite(9,HIGH); 
      Serial.println("HIGH");
      latchState == HIGH;
      }
    else{
      //delay(2000);
      digitalWrite(9,LOW); 
      Serial.println("LOW");
      latchState == LOW;
      }
      
  }
    
 */