int pirPin = D1; // motion sensor
int switchPin = D2; // switch that turn on the device
String body = "Hey, someone is in the bathroom"; //text content that will be sent to user's phone

void setup() 

{
    
    pinMode (switchPin, INPUT_PULLUP);
    // Switch is an input
    pinMode (pirPin, INPUT);
    // When someone is in the bathroom, the motion sensor will detect it, which is the input.
    
}

void loop() 

{
    
    int buttonState = digitalRead( switchPin );

    
    if (buttonState == LOW)
    
    {
    
        int pirState = digitalRead( pirPin );
        // Name the input of pir as pirState
    
        if ( pirState == HIGH ) // When someone enters
      {
        
        Particle.publish("twilio_sms", body, PRIVATE);
        delay(600000);
        // A text massage will be sent to the subscriber's phone every 10 mintutes when there is someone
        // and it will stop after the person leaves.
          
      }else{
          
          Particle.publish("twilio_sms", "Nobody is in the bathroom now.", PRIVATE);
          delay(600000);
        // A text massage will be sent to the subscriber's phone every 8 hours when there is no one
        // and it will stop after a person enters.
          
      }
          
    }

}