#define ECHO_PIN 2
#define TRIG_PIN 3
#include<LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);


void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH );
  return duration * 0.034 / 2;
   pinMode(echo, INPUT);
  pinMode(trigger, OUTPUT);
  lcd.init();

  lcd.backlight();
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.setCursor(0,0);
  lcd.print("Troll");
}
void loop() {
  float distance = readDistanceCM();

  bool isNearby = distance < 150;
  digitalWrite(LED_BUILTIN, isNearby);

  Serial.print("Measuared distance: ");
  Serial.println(readDistanceCM());
    lcd.clear();
  digitalWrite(trigger, LOW);
  digitalWrite(trigger, HIGH);
  time = pulseIn(echo, HIGH);
  distance = 0.0172*time;
  lcd.setCursor(0,0);
  lcd.print(distance);
  lcd.print(" Miles From");
  lcd.setCursor(0,1);
  lcd.print("PONGPON");

  delay(100);
}