#include <LiquidCrystal.h>//
int led=13;
int buzzer=1;
LiquidCrystal lcd(12, 11, 4, 5, 6, 7);// 2 rs 3 e 4 d4 etc 

const int trigPin = 8;
const int echoPin = 9;
long duration;
int distanceCm, distanceInch;

void setup() {
  pinMode(led,OUTPUT);
  pinMode(distanceCm,INPUT);
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);
distanceCm= duration*0.034/2;
distanceInch = duration*0.0133/2;

lcd.setCursor(0,0);
lcd.print("Distance: "); 
lcd.print(distanceCm);
lcd.print("  cm");
delay(10);
lcd.setCursor(0,1);
lcd.print("Distance: ");
lcd.print(distanceInch);
lcd.print("inch");
delay(10);
if (distanceCm<20){
  digitalWrite(led,HIGH);
    digitalWrite(buzzer,LOW);
}
  if (distanceCm>20){
  digitalWrite(led,LOW);
    digitalWrite(buzzer,HIGH);
  }


}