Fire alarm

#include "DFRobotDFPlayerMini.h"

int fireOn = 700;
int fireOff = 800;
bool fire = false;
bool alarm = false;
bool led = false;

DFRobotDFPlayerMini myDFPlayer;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(7, INPUT_PULLUP);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);

  digitalWrite(8, LOW);
  digitalWrite(9, LOW);

  myDFPlayer.begin(Serial);
  myDFPlayer.volume(30);
}

void loop() {
  // put your main code here, to run repeatedly:
  isThereFire();
  if (fire == true) {
    if (alarm == false) {
      myDFPlayer.play(1);
      alarm = true;
    }
  }
  else {
    if (buttonPushed()) {
      alarm = false;
    }
    if(alarm == false && buttonPushed()){
      unsigned long timestamp = millis() + 3000;
      while(buttonPushed()){
        if(timestamp <= millis()){
          alarm = true;
          digitalWrite(8, HIGH);
          digitalWrite(9, HIGH);
          tone(3, 5000);
        }
      }
    }
  }
  if (alarm == true) {
    digitalWrite(8, led);
    digitalWrite(9, !led);
    led = !led;
    tone(3, 2000, 50);
  }
  else {
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
  }
  delay(100);
}

void isThereFire() {
  int fireLevel = analogRead(A0);
  if (fireLevel < fireOn) {
    fire = true;
  }
  else if (fireLevel > fireOff) {
    fire = false;
  }
}

bool buttonPushed(){
  return digitalRead(7) == LOW;
}