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

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define Sensor  2
#define Relay   3

int doneFlag = 0;
int counter = 0;
unsigned char S;

void setup() {
  Serial.begin(9600);
  pinMode(Sensor, INPUT);
  pinMode(Relay, OUTPUT);
  digitalWrite(Relay, LOW);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Team [1] Project");
  delay(5000);// 5000 ms = 5 sec
  showDataOnLCD();
}

void loop() {
  Sensor_Scan();
  if (counter < 7 && doneFlag == 0) {
    if (S == 1)// sensor in black area
    {
      counter = counter + 1;
      showDataOnLCD();

      if (counter == 7) {
        //turn Relay ON
        digitalWrite(Relay, HIGH);
        doneFlag = 1;
      }
      else {
        //turn Relay OFF
        digitalWrite(Relay, LOW);
        delay(2000);
      }
      delay(2000);
    }
  }
}//end of loop..

void Sensor_Scan() {
  S = digitalRead(Sensor);//1
  Serial.println(S);
}

void showDataOnLCD() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Counter: ");
  lcd.print(counter);
}