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How to use 5x4 20 keys keypad with Arduino detect String

Using keypad with keys with more than one character is challenging. I have written code to remove the channel and you will be able to ready virtually any length key value in this video.

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/*
 * 
 * Original code from keypad.h library: MultiKey.ino (@author Mark Stanley)
 * Written and updated by Ahmad Shamshiri (Robojax.com) on May 06, 2020 at 19:37 in Ajax, Ontario, Canada
 * 
 * This code for 5X4 keypad with text (more than 1 character);
 * written the code to allow any text for key. 
keypad has 
            "F1",  "F2", "#", "*",
            "1",  "2", "3", "UP",
            "4",  "5", "6", "DOWN",
            "7",  "8", "9", "ESC",
            "LEFT",  "0", "RIGHT", "ENT"  
             
 * Video code: 
 * 
 * Watch video for details: https://youtu.be/sbQ3D1_x_tg
 * 
 * Neee Wiring Diagram and full explanation of the code :http://robojax.com/L/?id=62

 
You can get the wiring diagram and full explanition of this code from my Arduino Course at Udemy.com
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visit my course now http://robojax.com/L/?id=62

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* 
 * Code is available at http://robojax.com/learn/arduino

 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>. 

 */

#include <Keypad.h>

const byte ROWS = 5; //5 rows
const byte COLS = 4; //4 columns
char* specialKeys[] ={
            "F1",  "F2", "#", "*",
            "1",  "2", "3", "UP",
            "4",  "5", "6", "DOWN",
            "7",  "8", "9", "ESC",
            "LEFT",  "0", "RIGHT", "ENTER"  
                    };

                    
char specialKeysID[] = {
        'A',  'B', '#', '*',
        '1',  '2', '3', 'C',
        '4',  '5', '6', 'D',
        '7',  '8', '9', 'E',
        'F',  '0', 'G', 'H'
      };                    

char keys[ROWS][COLS] = {
{specialKeysID[0],  specialKeysID[1], specialKeysID[2], specialKeysID[3]},
{specialKeysID[4],  specialKeysID[5], specialKeysID[6], specialKeysID[7]},
{specialKeysID[8],  specialKeysID[9], specialKeysID[10], specialKeysID[11]},
{specialKeysID[12],  specialKeysID[13], specialKeysID[14], specialKeysID[15]},
{specialKeysID[16],  specialKeysID[17], specialKeysID[18], specialKeysID[19]}
};


byte rowPins[ROWS] = {2,3,4,5,6}; //connect to the row pinouts of the kpd
byte colPins[COLS] = {10,9,8,7}; //connect to the column pinouts of the kpd

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

unsigned long loopCount;
unsigned long startTime;
String msg;


void setup() {
  // Robojax 5x4 keypad test
  Serial.begin(9600);
  Serial.println("Robojax 5x4 keypad");
}


void loop() {
  // Robojax 5x4 keypad test
  char key = keypad.getKey();
    // just print the pressed key
    
   if (key){
    Serial.print("Key: ");
    Serial.println(getKey(key));
  } 
  if(getKey(key) =="ENTER")
  {
     Serial.println("ENTER is pressed");   
  }
  
//Robojax.com 5x4 keypad detecting string value
}  // End loop


/*
 * getKey()
 * @brief gets the actual key value from single character 
 * @param k is character
 * @return returns acualt key value
 * Written by Ahmad Shamshiri for robojax.com
 * on May 06, 2020 at 19:37 in Ajax, Ontario, Canada
 */
char* getKey(char *k)
{
 //Robojax.com 5x4 keypad detecting string value
  for(int i=0; i<20; i++)
  {
    if(specialKeysID[i] ==k) return specialKeys[i];
  }
 
}//getKey

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How to use 5x4 20 keys keypad with Arduino detect String

How to use 5x4 20 keys keypad with Arduino detect String

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