Checking the Connectivity Status of the HC-05 Bluetooth Module

Using Arduino Sensors
1

Hello, I have made a Door lock project using the HC-05 module and an android app. The problem is that sometimes the module disconnects with the phone and the app still tries to send commands to the Arduino. I want the Arduino to check the connection status of the module and the phone at every instance and display the status on the LCD. Please tell me how can I do this. My code is given below:

<
#include <LiquidCrystal.h>

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

int y=13,r=10,b=9;
void setup() {
digitalWrite(8, LOW);

digitalWrite(y, HIGH);

lcd.begin(16,2);lcd.setCursor (0,0);lcd.print("Haris Door Lock");
lcd.setCursor (4,1);lcd.print(" LOCKED ");
Serial.begin(9600);
pinMode(8, OUTPUT);
}

void loop() {
// put your main code here, to run repeatedly:
if(Serial.available()>0)
{
char data= Serial.read();
switch(data)
{
case 'o': digitalWrite(8, HIGH);digitalWrite(y, LOW);digitalWrite(b, HIGH);
lcd.setCursor (4,1);lcd.print("UNLOCKED");
delay(5000);digitalWrite(8, LOW);
lcd.setCursor (4,1);lcd.print(" LOCKED ");
digitalWrite(y, HIGH);digitalWrite(b, LOW);
break;

    case 'c': digitalWrite(8, LOW);
    digitalWrite(y, LOW);digitalWrite(r, HIGH);
     lcd.setCursor (4,1);lcd.print(" SEALED ");delay(120000);
     lcd.setCursor (4,1);lcd.print(" LOCKED ");digitalWrite(r, LOW);digitalWrite(y, HIGH);
     break; 
    default : break;
  }
  Serial.println(data);

}
delay(50);
}
/>

2

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3

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