#include <Keypad.h>

const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 4;
byte rowPins[KEYPAD_ROWS] = {13, 12, 11, 10};
byte colPins[KEYPAD_COLS] = {A3, A2, A1, A0};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3', '+'},
  {'4', '5', '6', '-'},
  {'7', '8', '9', '*'},
  {'.', '0', '=', '/'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

void setup() {
  Serial.begin(115200);
  pinMode(A4, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);

}

void loop() {
  char key = keypad.getKey();
  
  if(key != NO_KEY) {
    if(key =='1'){  
    print1();
  }
  }
  if(key != NO_KEY) {
    if(key =='2'){  
    print2();
  }
  }
  if(key != NO_KEY) {
    if(key =='3'){  
    print3();
  }
  }  
    if(key != NO_KEY) {
    if(key =='4'){  
    print4();
  }
    }
    if(key != NO_KEY) {
    if(key =='5'){  
    print5();
  }
    }
    if(key != NO_KEY) {
    if(key =='6'){  
    print6();
  }
    }
    if(key != NO_KEY) {
    if(key =='7'){  
    print7();
  }
    }
    if(key != NO_KEY) {
    if(key =='8'){  
    print8();
  }
    }
    if(key != NO_KEY) {
    if(key =='9'){  
    print9();
  }
  }
}




void print1() {
digitalWrite(A4, HIGH);
delay(5000);
digitalWrite(A4, LOW);
}

void print2() {
digitalWrite(2, HIGH);
delay(5000);
digitalWrite(2, LOW);
}

void print3() {
digitalWrite(3, HIGH);
delay(5000);
digitalWrite(3, LOW);
}

void print4() {
digitalWrite(4, HIGH);
delay(5000);
digitalWrite(4, LOW);
}

void print5() {
digitalWrite(5, HIGH);
delay(5000);
digitalWrite(5, LOW);
}

void print6() {
digitalWrite(6, HIGH);
delay(5000);
digitalWrite(6, LOW);
}

void print7() {
digitalWrite(7, HIGH);
delay(5000);
digitalWrite(7, LOW);
}

void print8() {
digitalWrite(8, HIGH);
delay(5000);
digitalWrite(8, LOW);
}

void print9() {
digitalWrite(9, HIGH);
delay(5000);
digitalWrite(9, LOW);
}