Control LCD and Ultrasound Sensor with Arduino

#include <LiquidCrystal.h>
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
void setup() {
lcd.begin(16, 2);
lcd.print("hello, world!");
delay(2000);
lcd.clear();
}
void loop() {
lcd.setCursor(0, 0);
lcd.print("time : ");
lcd.print(millis() / 1000);
char second = 's';
lcd.print(second);
}
#include <LiquidCrystal.h>
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int trigPin = 9;
int echoPin = 8;
long distance;
long duration;
void setup() {
lcd.begin(16, 2);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop() {
ultra();
lcd.setCursor(0, 0);
lcd.clear();
lcd.print("UltraSonic");
lcd.setCursor(0, 1);
lcd.print("distance : ");
lcd.print(distance);
lcd.print("cm");
delay(200);
if(distance <=10){
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);
}
digitalWrite(13, LOW);
}
void ultra(){
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);
// Calculating the distance
distance= duration*0.034/2;
}