Keypad Library... Returning a string after user pressed a certain character

Projects Programming
11

Thanks for all the replies :slight_smile:
I have spend some time getting info from each one of the messages and have a working code that does what it is meant to do. I took into consideration NO_Key, which return nothing when the user press ' F ' with no inputs in the buffer.
Working code

/* @file CustomKeypad.pde
|| @version 1.0
|| @author Alexander Brevig
|| @contact alexanderbrevig@gmail.com
||
|| @description
|| | Demonstrates changing the keypad size and key values.
|| #
*/
#include <Keypad.h>
char key;
char buffer[7];
int i;
const byte ROWS = 2; //four rows
const byte COLS = 3; //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
  {'A','B','C'},
  {'D','E','F'}
  
};
byte rowPins[ROWS] = {9,8 }; //connect to the row pinouts of the keypad
byte colPins[COLS] = {7, 6, 5}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 

void setup(){
  Serial.begin(9600);
}
  
void loop(){
  i = 0;
  buffer[0] = '\0';
  while( i < sizeof(buffer) - 1)
  {
    
  key = getChar();
  if (key == 'F')
     {
    break;
     }
     
   else if ( key != NO_KEY)
    {
      buffer[i] = key;
      i++;
      buffer[i]= '\0';
      }
   
  }
  Serial.println(buffer);
}
  
   
   char getChar()
{
  char key = customKeypad.getKey();
  if (key != NO_KEY)
  {
     return key;
  }
  else { 
  return NO_KEY;
   }
  }

Screenshot of Serial Monitor

Image of setup

Thanks again to all the replies.