#include <LiquidCrystal_I2C.h>
#include <Keypad_I2C.h>
#include <Keypad.h>          // GDY120705
#include <Wire.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);// initialisation LCD
#define I2CADDR 0x20

const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {
	{'1','4','7','*'},
  {'2','5','8','0'},
  {'3','6','9','#'},
  {'A','B','C','D'}
	};
byte rowPins[ROWS] = {3, 2, 1, 0}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {7, 6, 5, 4}; //connect to the column pinouts of the keypad
	
Keypad_I2C keypad = Keypad_I2C( makeKeymap(keys), rowPins, colPins, ROWS, COLS, I2CADDR );
byte ledPin = 40; 

boolean blink = false;

void setup(){
  lcd.backlight();// active retro-eclairage
  Serial.begin(19200);
  keypad.begin( );          // GDY120705
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
  digitalWrite(ledPin, HIGH);   // sets the LED on
  keypad.addEventListener(keypadEvent); //add an event listener for this keypad
lcd.setCursor(0,1); 
  lcd.print("Didiersee");
}
  
void loop(){
  char key = keypad.getKey();
  
  if (key) {
    Serial.println(key);
  }
  if (blink){
    digitalWrite(ledPin,!digitalRead(ledPin));
    delay(100);
  }
}

//take care of some special events
void keypadEvent(KeypadEvent key){
  switch (keypad.getState()){
    case PRESSED:
      switch (key){
        case '#': digitalWrite(ledPin,!digitalRead(ledPin)); break;
        case '*': 
          digitalWrite(ledPin,!digitalRead(ledPin));
        break;
      }
    break;
    case RELEASED:
      switch (key){
        case '*': 
          digitalWrite(ledPin,!digitalRead(ledPin));
          blink = false;
        break;
      }
    break;
    case HOLD:
      switch (key){
        case '*': blink = true; break;
      }
    break;
  }
}