How to make Home Security system

1#include "DFRobotDFPlayerMini.h"
2const int buttonPin = 7;
3int  buttonState = 0;
4DFRobotDFPlayerMini player;
5
6void setup() {
7  
8pinMode(buttonPin,  INPUT);
9  // Init USB serial port for debugging
10  Serial.begin(9600);
11  // Init serial port for DFPlayer Mini
12  //softwareSerial.begin(9600);
13
14  // Start communication with DFPlayer Mini
15  if (player.begin(Serial)) {
16   Serial.println("OK");
17
18    // Set volume to maximum (0 to 30).
19    player.volume(30);
20    // Play the first MP3 file on the SD card
21    //player.play(1);
22  } else  {
23    Serial.println("Connecting to DFPlayer Mini failed!");
24  }
25}
26
27void  loop() {
28  buttonState = digitalRead(buttonPin);
29   if (buttonState == HIGH)  {
30    player.play(1);
31  }
32}