#include <Wire.h>
#include <LiquidCrystal_PCF8574.h>

LiquidCrystal_PCF8574 lcd(0x27);  // set the LCD address to 0x27 for a 16 chars and 2 line display

const int trigPin = 12;
const int echoPin = 11;

void setup()
{

  Serial.begin(115200);
   while (! Serial);
  Wire.begin();
  Wire.beginTransmission(0x27);

  lcd.begin(16, 2);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  Serial.println("LCD...");
}
int getDist(){

     digitalWrite(trigPin, LOW);
     delayMicroseconds(2);

     digitalWrite(trigPin, HIGH);
     delayMicroseconds(10);

     digitalWrite(trigPin, LOW);
     return (pulseIn(echoPin, HIGH) / 58.2);

  }
void loop()
{
   lcd.setBacklight(255);
    lcd.home(); lcd.clear();
    lcd.print( getDist() );
    lcd.print( " cm distance" );
    delay(300);
}