#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16,2);
const int trigPin = 10;
const int echoPin = 9;
long duration;
int distanceCm;
void setup() {
lcd.init();
lcd.begin(16, 2); // Initializes the interface to the LCD display
lcd.backlight();
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
}
void loop() {
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distanceCm = duration * 0.0340 / 2;
lcd.setCursor(0, 0);
lcd.print("Khoangcach:");
lcd.print(distanceCm);
lcd.print("cm");
lcd.setCursor(0, 1);
lcd.print(" ");
delay(1000);
}