#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo myservo;
int sensorValue;
int flag = 0;
int pos = 0;

void setup() {

  Serial.begin(9600);
  myservo.attach(9);
  myservo.write(0);
  pinMode(13, OUTPUT);
  pinMode(A0, INPUT);
  lcd.init();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Sensor Value:");

}


void loop() {

  sensorValue = analogRead(A0);
  lcd.setCursor(0, 1);
  lcd.print(sensorValue);
  lcd.print("                ");
  if (sensorValue > 400 && flag == 0) {
    digitalWrite(13, HIGH);
    flag = 1;
    for (pos = 0; pos <= 90; pos += 1) {
      myservo.write(pos);
      delay(25);
    }
    delay(5000);
  }
  else if (sensorValue <= 300 && flag == 1) {
    digitalWrite(13, LOW);
    flag = 0;
    for (pos = 90; pos >= 0; pos -= 1) {
      myservo.write(pos);
      delay(25);
    }
    delay(5000);
  }

  Serial.println(sensorValue, DEC);
  delay(1000);

}// end of LOOP