#include <LiquidCrystal.h>
LiquidCrystal lcd(21,19,18,5,2,15);//rs,e,d4,d5,d6,d7
const int trigP=4;
const int echoP=22;
long duration;
int distance;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(trigP, OUTPUT);
  pinMode(echoP, INPUT);
  lcd.begin(16,2);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation

  digitalWrite(trigP, LOW);
  delayMicroseconds(2);
  digitalWrite(trigP, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigP, LOW);
  duration=pulseIn(echoP,HIGH);
  distance=duration*0.034/2;
  lcd.setCursor(0,0);
  lcd.print("distance");
  lcd.print(distance);
  lcd.print("cm ");
  delay(1000);
}