#include <Keypad.h>
const byte ligne=4;
const byte colone=4;

byte ligneporte[ligne]={9,8,7,6};
byte coloneporte[colone]={5,4,3,2};

char clavier[ligne][colone]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
 Keypad keypad=Keypad(makeKeymap(clavier),ligneporte,coloneporte,ligne,colone);

void setup() {
  Serial.begin(9600);

}

  
void loop() {
  char key = keypad.getKey();

  if (key != NO_KEY) {
    Serial.println(key);
  }
}