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

// for ultrasonic sensor
// A0 TO A3 for I/P and A4 and A5 for led blinking.

int trig_0 = 2;
int echo_0 = 3;
int dist_0;
int Led_0 = 13;
int Led_1 = 11;

// for display

LiquidCrystal_I2C lcd(0x27, 16, 2);

// for relay

int relay = 12;

void setup() {
  // for ultrasonic sensor

  pinMode(trig_0, OUTPUT);
  pinMode(echo_0, INPUT);

  pinMode(relay, OUTPUT);
  // for Display

  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

  // for relay or coil
}

void loop() {
  Led();
    digitalWrite(relay, HIGH);
  
  // for display

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Charging Station");
  lcd.setCursor(0, 1);
  lcd.print("Charged Off");

  digitalWrite(trig_0, LOW);
  delayMicroseconds(2);
  digitalWrite(trig_0, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig_0, LOW);
  long duration_0 = pulseIn(echo_0, HIGH);
  dist_0 = duration_0 * 0.034 / 2;

  if (dist_0 <= 25) {
    lcd.setCursor(0, 1);
    lcd.print("Charged On ");
    digitalWrite(relay, LOW);
    delay(1000);
  }
}
void Led(){
  digitalWrite(Led_0, HIGH);
  delay(5000);
  digitalWrite(Led_0, LOW);
  delay(5000);
  digitalWrite(Led_1, HIGH);
  delay(5000);
  digitalWrite(Led_1, LOW);
  delay(5000);
}