Save char to Lcd screen help

Using Arduino Displays
1

I am trying to display a Name to an Lcd display, made up of an array of character letters to make the name.
Button 1= increments a letter in the character array.

Button2 = selects the array letter and moves the cursor forward into the next position for the next letter to make up a name, and puts it into a new word array.

Button 3 = Saves the new Name to the new word array.

here is my problem!
Button 4 = moves the cursor backward in order to edit any of the selected letters.
it does this, but it also deletes the letters in the Name when changing positions.

What I want it to do is to move the cursor backward to the position that needs the selected letter changed so I can edit the letter without changing the rest of the Name.

Any help would be great.

#include <LiquidCrystal.h>


// Button assignment and definitions
const int button[] = { 11, 12, 2, 3, A1, A0, A2 };
const int numButtons = sizeof(button) / sizeof(button[0]);
enum { B_SEL, B_INC, B_DEC, B_SAVE, B_READ, B_ENTER, R_back };

int lastButtonState[numButtons];

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);



const char* Editchars = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890,.!?&@#$%^*_-+=(){}[]<>|\\/'\"~";

char prgn[] = "              progr";
int selectIdx = 0;  
int columnIdx = 0; 
int wordIdx = 0;  
int Sync = 0;

int wordct = 0;

void setup()
{
  lcd.begin(16, 2);
  //lcd.print (output);
  Serial.begin(9600);

  for ( int i = 0; i < numButtons; ++i ) {
    pinMode (button[i], INPUT_PULLUP);
  }
}

void loop()
{
  int buttonState;

  //*******************Savetoarray,and move cursor***************
  buttonState = digitalRead(button[B_INC]);

  // compare the buttonState to its previous state
  if (buttonState != lastButtonState[B_INC]) {
    if (buttonState == LOW) {
      wordIdx++;

      prgn[wordIdx] = Editchars[selectIdx];
     

     columnIdx++;
      
      lcd.setCursor(columnIdx + 7, 0);
lcd.cursor();
      Serial.println("scroll");
     Serial.println(prgn);
      selectIdx = 0;
                 if (columnIdx > 5) columnIdx = 0;      
    }
  }
  lastButtonState[B_INC] = buttonState;

  //************** Char select***************************

  if (digitalRead(button[B_SEL]) == LOW) {
  
    
    
    selectIdx++;
    
       
    lcd.setCursor(columnIdx + 7, 0);

    lcd.print(Editchars[selectIdx]);
           lcd.setCursor(columnIdx + 7, 0);

    lcd.cursor();
    delay(50);
    
  }


  // *****************Increment character back*************************************
  buttonState = digitalRead(button[B_DEC]);
  if (buttonState != lastButtonState[B_DEC]) {
    if (buttonState == LOW) {
      selectIdx--;
      if (selectIdx < 1) selectIdx = 1;
      //lcd.cursor();
      lcd.setCursor(columnIdx + 7, 0);
      lcd.print(Editchars[selectIdx]);
      
    }
  }
  lastButtonState[B_DEC] = buttonState;

  //************************************

   buttonState = digitalRead(button[B_SAVE]);

  // compare the buttonState to its previous state
  if (buttonState != lastButtonState[B_SAVE]) {
    if (buttonState == LOW) {
     // selectIdx--;
wordIdx--;
     
      columnIdx--;
     
      lcd.setCursor(columnIdx + 7 , 0);
lcd.cursor();
   
      Serial.println("scroll");
      Serial.println(prgn);
selectIdx = 0;
      if (columnIdx < 1) columnIdx = 0;
      
    }
  }
  lastButtonState[B_SAVE] = buttonState;



  //************************reading from 
 buttonState = digitalRead(button[R_back]);
  if (buttonState != lastButtonState[R_back]) {
    if (buttonState == LOW) {
       prgn[wordIdx + 1] = '\0';
  Serial.print(prgn);
  }
  }
  lastButtonState[R_back] = buttonState;
}
2

It is confusing to me that you describe the desired behavior of 4 buttons (1-4), yet your code defines 7 buttons. What this the mapping from button 1..4 to B_SEL, B_INC, B_DEC, B_SAVE, B_READ, B_ENTER, R_back ?

3

Apologies, I have been trying to get this working all day.

Button1=B_SEL
Button2 = B_INC
Button3 = R_back
Button4 = B_SAVE

Thanks for the reply.

4

I Can get it to work on the lcd screen but it wont save it, the way it is on the screen.

5

That does not seem to align with your original descriptions of the buttons

The first step in any project is clearly describing the inputs/outputs

6

B_SEL = increments a letter forward in the character array.
B_INC = puts the character from B_SEL and saves that character to the new Name(prgn) and moves the cursor to the next position.
B_SAVE = moves the cursor backwards from the previous cursor position along the new name, deleting each character as it moves backwards
R_Back = Saves the new name to a new array and prints the new word to the serial monitor.

7

How do i get the cursor to move back through the new Name without deleting each position as the cursor moves back?

buttonState = digitalRead(button[B_SAVE]);

  // compare the buttonState to its previous state
  if (buttonState != lastButtonState[B_SAVE]) {
    if (buttonState == LOW) {
     // selectIdx--;
wordIdx--;
     
      columnIdx--;
     
      lcd.setCursor(columnIdx + 7 , 0);
lcd.cursor();
   
      Serial.println("scroll");
      Serial.println(prgn);
selectIdx = 0;
      if (columnIdx < 1) columnIdx = 0;
      
    }
  }
  lastButtonState[B_SAVE] = buttonState;
8

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