#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C LCD(0X27,16,2);
const int tp=4;
const int ep=3;
void setup() {
  // put your setup code here, to run once:
  LCD.init();
  LCD.backlight();
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
pinMode(3, INPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(tp, LOW);
delayMicroseconds(2);
digitalWrite(tp, HIGH);
delayMicroseconds(10);
digitalWrite(tp, LOW);
long duration=pulseIn(ep,HIGH);
long distance=duration*0.034/2;
LCD.setCursor(0,0);
LCD.print("Distance:");
LCD.print(distance);
LCD.println(" CM");
LCD.scrollDisplayRight();
delay(100);
if(distance<=400&&distance>=350){
  digitalWrite(2, HIGH);
   digitalWrite(7, LOW);
  digitalWrite(8, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  LCD.setCursor(0,1);
  LCD.print("Low   ");
}else if(distance<350&&distance>=300){
  digitalWrite(2, HIGH);
  digitalWrite(7, HIGH);
  digitalWrite(8, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
   LCD.setCursor(0,1);
   LCD.print("Low   ");
}
else if(distance<300&&distance>=200){
  digitalWrite(2, HIGH);
  digitalWrite(7, HIGH);
  digitalWrite(8, HIGH);
   digitalWrite(5, LOW);
  digitalWrite(6, LOW);
   LCD.setCursor(0,1);
   LCD.print("Medium");
}else if(distance<200&&distance>=100){
  digitalWrite(2, HIGH);
  digitalWrite(7, HIGH);
  digitalWrite(8, HIGH);
  digitalWrite(5, HIGH);
   digitalWrite(6, LOW);
    LCD.setCursor(0,1);
    LCD.print("Medium");
} else if(distance<100&&distance>=50){
  digitalWrite(2, HIGH);
  digitalWrite(7, HIGH);
  digitalWrite(8, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
   LCD.setCursor(0,1);
   LCD.print("Full  ");
}
}