Juego de pulsadores

#include <LCD.h>
#include <LiquidCrystal_I2C.h>
    //By creadpag

    // initialize the library with the numbers of the interface pins

    LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

    const int button1 = 7;

    const int button2 = 8;

    const int button3 = 9;

    const int button4 = 10;


    int button1state = 0;

    int button2state = 0;

    int button3state = 0;

    int button4state = 0;


    int check = 0;


    int unlock_var = 0;

    int unlock_code = 100;

    int temp_num;

    int gate = 0;


    void setup() {



      pinMode(button1, INPUT);

      pinMode(button2, INPUT);

      pinMode(button3, INPUT);

      pinMode(button4, INPUT);

      // set up the LCD's number of columns and rows:

      lcd.begin(16, 2);

      // Print a message to the LCD.

      lcd.print("System State:");

    }



    void loop(){

      // read the state of the pushbutton value:

      button1state = digitalRead(button1);

      button2state = digitalRead(button2);

      button3state = digitalRead(button3);

      button4state = digitalRead(button4);



    //  lcd.print("                   ");

    //  // check if the pushbutton is pressed.

    //  // if it is, the buttonState is HIGH:

    //  if (button1state == HIGH) {

    //    // show "yes" message

    //    lcd.setCursor(0,1);

    //    lcd.print("Pressed");

    //  }

    //  else {

    //    // show "no" message

    //    lcd.setCursor(0,1);

    //    lcd.print("NOT Pressed");

    //  }




         lcd.setCursor(0,1);

         lcd.print("Waiting...        ");



         if(button1state == HIGH)

         {

           unlock_var = 26;

           lcd.setCursor(0,1);

           lcd.print("Reading...");

           delay(500);

         }

         if(button2state == HIGH)

         {

           unlock_var = unlock_var*3;

           lcd.setCursor(0,1);

           lcd.print("Reading...");

           delay(500);

         }

         if(button3state == HIGH)

         {

           temp_num = unlock_var;

           temp_num = temp_num/2;

           temp_num = temp_num-17;

           unlock_var = unlock_var + temp_num;

           lcd.setCursor(0,1);

           lcd.print("Reading...");

           delay(500);

         }



        if(button4state == HIGH)

        {

          check = 1;

        }



       if(check == 1)

       {

            lcd.setCursor(0,1);

            lcd.print("Checking Code...");

            delay(1000);



           if(unlock_var == unlock_code)

           {

              lcd.setCursor(0,1);

              lcd.print("Access Granted    ");

              delay(10000); //unlock delay

              unlock_var = 0;

           }

           else

           {

             lcd.setCursor(0,1);

             lcd.print("Access Denied     ");

             delay(1500);

             unlock_var = 0;

             check = 0;

           }



       }

    }