... , when there is input in F1 pin, it will display “STOP”; Set it as 4, when there is input in F1 pin ... , it will display “FIRE”; Set it as 5, when there is input in F1 pin ... , when there is input in F2 pin, it will display “STOP”; Set it as 4, when there is input in F2 pin ... , it will display “FIRE”; Set it as 5, when there is input in F2 pin ...