#include <LiquidCrystal.h>

LiquidCrystal lcd (4,5,6,7,8,9);

int redPin=10;
int bluePin=11;
int greenPin=12;

int piezoPin=13;

bool alarmOn=false;

void setup(){
  
  pinMode(redPin,OUTPUT);
  pinMode(bluePin,OUTPUT);
  pinMode(greenPin,OUTPUT);
  pinMode(piezoPin,OUTPUT);
  
  lcd.begin(16,2);
  
  Serial.begin(9600);
  
  lcd.print("Alarm is OFF");

}


void loop (){
  if (Serial.available()>0){
    char command=Serial.read();
    
    if (command=='1'){
      alarmOn=true;
      lcd.clear();
      lcd.print("Alarm is On");
      digitalWrite(redPin,HIGH);
      digitalWrite(greenPin,LOW);
      digitalWrite(bluePin,LOW);
      
      tone (piezoPin,1000);
      
                     
    }
    
    else if (command=='0'){
      
      alarmOn=false;
      lcd.clear();
      lcd.print("Alarm is OFF");
      digitalWrite(redPin,LOW);
      digitalWrite(greenPin,LOW);
      digitalWrite(bluePin,LOW);
      
      noTone(piezoPin);
      
    }
  }

}