#include <LiquidCrystal.h>

// Set up the LCD screen
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Set up the buzzer
int buzzerPin = 9;

// Set up the push button switch
int switchPin = 7;

// Variable to store the previous state of the push button switch
int prevSwitchState = HIGH;

void setup() {
  // Set up the LCD screen
  lcd.begin(16, 2);
  
  // Set up the buzzer
  pinMode(buzzerPin, OUTPUT);
  
  // Set up the push button switch
  pinMode(switchPin, INPUT);
}

void loop() {
  // Check the push button switch
  int switchState = digitalRead(switchPin);
  if (switchState == LOW && prevSwitchState == HIGH) {
    // Push button switch is touched
    digitalWrite(buzzerPin, HIGH);
    lcd.clear();
    lcd.print("The touch sensor");
    lcd.setCursor(0, 1);
    lcd.print("has been disconnected");
  } else {
    // Push button switch is not touched
    digitalWrite(buzzerPin, LOW);
    lcd.clear();
    lcd.print("Touch sensor is OK");
  }
  
  prevSwitchState = switchState;
  delay(100);
}