/*4x4 Matrix Keypad connected to Arduino
This code prints the key pressed on the keypad to the serial port*/
//LIBRERIAS
#include <Wire.h>
#include <Keypad.h>
#include <LiquidCrystal.h>
//------------
//MATRIZ
const byte numRows= 3; //number of rows on the keypad
const byte numCols= 11; //number of columns on the keypad
//keymap defines the key pressed according to the row and columns just as appears on the keypad
char keymap[numRows][numCols]=
{
{'z','b','c','v','b',' ','n','m','.','?','ç'},
{'q','w','e','r','t','y','u','i','p','`','o'},
{'a','s','d','f','g','h','j','k','ñ','´','l'}
};
//Code that shows the the keypad connections to the arduino terminals
byte rowPins[numRows] = {31,33,35}; //Rows 0 to 3  13 12 11
byte colPins[numCols]= {37,39,41,43,45,47,49,51,53,52,50}; //Columns 0 to 3  10 9 8 7 6 5 4 3 2 14 15
//-------------
//initializes an instance of the Keypad class
char texto[7];
int v1;
int v2;
int x=0;
byte a = 0;
int value=0;
Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup()
{
  
lcd.begin(16, 2);              // start the library
lcd.setCursor(0,0);
//ENVIADO
pinMode(22,OUTPUT);
pinMode(24,INPUT);
digitalWrite(22, HIGH);
Wire.begin();
//-------
Serial.begin(9600);
v1 = 0;
v2 = 0;
}

byte env = 0;

//If key is pressed, this key is stored in 'keypressed' variable
//If key is not equal to 'NO_KEY', then this key is printed out
//if count=17, then count is reset back to 0 (this means no key is pressed during the whole keypad scan process

void loop(){

  value=digitalRead(24);
char keypressed = myKeypad.getKey();
v1 = 0;
if (x != 7){
    if (keypressed != NO_KEY){
        v1 = 1;
        if(v1 == 1 && v2 == 0){
        texto [x] =keypressed;
        lcd.print(keypressed);
        Serial.print(keypressed);
        //Serial.print(texto[x]);
        x++;        
        }
    }
}
v2 = v1;
delay(100);
    if(keypressed == '?'){
    lcd.clear();
    lcd.print("ENVIANDO...");
    //----ENVIO----
   
      enviar();
     
    delay(5000);
    x = 0;
    lcd.clear();
    //-------------
  }
}

void enviar()
{
  
  int Nletras= x;
  int indexLetras=0;
  for(int Nmariposas=0; Nmariposas<Nletras; Nmariposas=Nmariposas+1)
  {
    Wire.beginTransmission(Nmariposas); // transmit to device #x+1  
    Wire.write(texto[Nmariposas]);    
    Wire.endTransmission();    // stop transmitting
  }
}