#include <Keypad.h>
const uint8_t ROWS = 4;
const uint8_t COLS = 4;

int a=1; 
int b=2; 
int c=3; 
int d=4; 
int e=5; 
int f=6; 
int g=7; 

char keys[ROWS][COLS] = 
{
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t rowPins[ROWS] = {8,9,10,11}; // Pins connected to R1, R2, R3, R4
uint8_t colPins[COLS] = {12,13,14,15}; // Pins connected to C1, C2, C3, C4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup()
 {
    Serial1.begin(115200);
    pinMode(a, OUTPUT); 
    pinMode(b, OUTPUT); 
    pinMode(c, OUTPUT); 
    pinMode(d, OUTPUT); 
    pinMode(e, OUTPUT); 
    pinMode(f, OUTPUT); 
    pinMode(g, OUTPUT); 
 }

void one() 
{ 
digitalWrite(a,LOW); 
digitalWrite(b,HIGH); 
digitalWrite(c,HIGH); 
digitalWrite(d,LOW); 
digitalWrite(e,LOW); 
digitalWrite(f,LOW); 
digitalWrite(g,LOW); 
delay(1000); 
} 
void two() 
{ 
digitalWrite(a,HIGH); 
digitalWrite(b,HIGH); 
digitalWrite(c,LOW); 
digitalWrite(d,HIGH); 
digitalWrite(e,HIGH); 
digitalWrite(f,LOW); 
digitalWrite(g,HIGH); 
delay(1000); 
} 
void three() 

{ 
digitalWrite(a,HIGH); 
digitalWrite(b,HIGH); 
digitalWrite(c,HIGH); 
digitalWrite(d,HIGH); 
digitalWrite(e,LOW); 
digitalWrite(f,LOW); 
digitalWrite(g,HIGH); 
delay(1000); 
}
void four()
{
digitalWrite(a,LOW);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
delay(1000);
}
void five()
{
digitalWrite(a,HIGH);
digitalWrite(b,LOW);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,LOW);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
delay(1000);
}
void six()
{
digitalWrite(a,HIGH);
digitalWrite(b,LOW);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
delay(1000);
}
void seven()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,LOW);
digitalWrite(g,LOW);
delay(1000);
}
void eight()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
delay(1000);
}
void nine()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,LOW);
digitalWrite(e,LOW);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
delay(1000);
}
void zero()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,LOW);
delay(1000);
}
void A()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,LOW);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
delay(1000);
}
void B()
{
digitalWrite(a,HIGH);
digitalWrite(b,HIGH);
digitalWrite(c,HIGH);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,HIGH);
delay(1000);
}
void C()
{
digitalWrite(a,HIGH);
digitalWrite(b,LOW);
digitalWrite(c,LOW);
digitalWrite(d,HIGH);
digitalWrite(e,HIGH);
digitalWrite(f,HIGH);
digitalWrite(g,LOW);
delay(1000);
}

void loop() 
{
  char key = keypad.getKey();
  if (key != NO_KEY)
   {
    Serial1.print(key);
    switch (key) 
    {
        case '1': one(); break;
        case '2': two(); break;
        case '3': three(); break;
        case '4': four(); break;
        case '5': five(); break;
        case '6': six(); break;
        case '7': seven(); break;
        case '8': eight(); break;
        case '9': nine(); break;
        case '0': zero(); break;
        case 'A': A(); break;
        case 'B': B(); break;
        case 'C': C(); break;
        case 'D': zero(); break;
        default: // Handle unexpected inputs
        break;
    }
}
}