#include <LiquidCrystal.h>

LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

int trigPin = 9;
int echoPin = 10;
long duration, cm;

void setup() {
  lcd.begin(16, 2);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  cm = duration / 58;
  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
  lcd.print(cm);
  lcd.print(" cm");
  if (cm < 5) {
    lcd.setCursor(0, 1);
    lcd.print("Gesture: HAND");
    tone(11, 1000, 500);
  } else {
    noTone(11);
    lcd.clear();
  }
  delay(100);
}