#include <Wire.h>
#include <LiquidCrystal.h>
const int trig = 13;
const int echo = 12;
const int led1 = 5;
const int led2 = 4;
const int led3 = 3;
const int led4 = 2;
LiquidCrystal lcd(11,10,9,8,7,6);
void setup() {
  lcd.begin(16,2);
  Wire.begin();
  Serial.begin(9600);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);

}

void loop() {
  digitalWrite(trig, HIGH);
  digitalWrite(trig, LOW);
  int duration = pulseIn(echo, HIGH);
  int cm = map(duration, 118, 23359, 2, 400);
  int inch = cm / 2.54;
  lcd.setCursor(0,0);
  lcd.clear();
  lcd.print("Inches: ");
  lcd.print(inch);
  lcd.setCursor(0,1);
  lcd.print("cm: ");
  lcd.print(cm);
  if (cm <= 350) {
    digitalWrite(led1, HIGH);
  } else {
    digitalWrite(led1, LOW);
  } if (cm <= 250) {
    digitalWrite(led2, HIGH);
  } else {
    digitalWrite(led2, LOW);
  } if (cm <= 150) {
    digitalWrite(led3, HIGH);
  } else {
    digitalWrite(led3, LOW);
  } if (cm <= 50) {
    digitalWrite(led4, HIGH);
    delay(75);
    digitalWrite(led1, LOW);
    delay(75);
    digitalWrite(led2, LOW);
    delay(75);
    digitalWrite(led3, LOW);
    delay(75);
    digitalWrite(led4, LOW);
    delay(75);
  }
}