Keypad string manual input

Projects General Guidance
1

I have made a part counter using an IR sensor, 4x4 keypad and an lcd screen. It works by incrementing "count" and displaying the value on the lcd. It works fine as it is but I would like a way to manually input numbers onto the screen that could then be incremented. Right now my "C" and "D" button will increase or decrease the count if I need it to, I just think it would be nice to have a feature where I can type it in on the number pad. When I tried doing this before my increment would ignore the value I typed in. Is there a way I can impliment this feature? I am pretty new to arduino. This is my code right now. Thanks to everyone for taking the time to read and have an amazing day.

#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <Keypad.h> //libraries

static int count = 0; //variable used as first number
unsigned long lastTime = millis();
unsigned long wait = 1000;

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2);

const byte ROWS = 4;
const byte COLS = 4;

bool blinking = false;

int buttonState=0;
int lastButtonState=0;
int buttonPushCounter =0;
int memory;

  void partLoc(){
      lcd.setCursor(7,1);
    }

  void fabLoc(){
      lcd.setCursor(11,0);
    }
  
  void clearScreen(){
      lcd.print("     ");
    }

  void countUp(){        
      count++;
      partLoc();
      clearScreen();
        partLoc();
      lcd.print(count);
        for (int i = 0; i <= 16; i++) {
          blinking=false;
            lcd.setCursor(i,1);
            
          }
          
          tone(52,2200);
          delay(100);
          noTone(52);
          
      }

  void countDown(){
      if(count!=0){
          count--;
          partLoc();
        clearScreen();
          partLoc();
        lcd.print(count);
            partLoc();
            lcd.print(count);
            for (int i = 0; i <= 16; i++) {
            blinking=false;
              lcd.setCursor(i,1);
            }
                tone(52,2100);
          delay(100);
          noTone(52);
          }
      }
      
char hexaKeys [ROWS][COLS] ={
        {'1','2','3','A'},
        {'4','5','6','B'},
        {'7','8','9','C'},
        {'*','0','#','D'}
      };

byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);



void setup()
{
 lcd.init();
  lcd.backlight();
  pinMode (52,OUTPUT);
  pinMode(51, OUTPUT);
  Serial.begin(9600);
  pinMode(13,INPUT);
  lcd.begin(16, 2);
  delay(500);
  lcd.print("Fab Cell #");
  lcd.setCursor(0,1);
  delay(500);
  lcd.print("Part #");
  lcd.setCursor(11,0);
  lcd.blink();
}



void loop(){

  int sensor = digitalRead(53);
  unsigned long timeNow = millis();
  
  
  buttonState = digitalRead(53);
  
  if (buttonState != lastButtonState) {
    if (buttonState == 1)  {
      buttonPushCounter++;
    } else {
      //Serial.println("off");
      if (timeNow - lastTime > wait){ // adds delay after the count up but allows for input during the delay.  delay will not stop the rest of the program from running
      countUp();
      Serial.println(count);
      lastTime=timeNow;
      }
    }
  lastButtonState = buttonState;
}
          
  char customKey = customKeypad.getKey();
  
  if (blinking){
    lcd.blink();
   }
    
  //Switchcase Statements

  switch (customKey){
    
    case 'C':
      countUp();
      Serial.println(count);
      break;

    case 'D':
    countDown();
    Serial.println(count);
      
      break;

    case 'B':
      fabLoc();
      clearScreen();
      fabLoc();
      blinking = true;
          tone(52,2200);
          delay(100);
          noTone(52);
      break;    
    }

  // Allows button input from buttons 0 - 9
  if ((customKey>='0') && (customKey <= '9')){
      lcd.print(customKey);
      for (int i = 0; i <= 16; i++) {
          blinking=false;
            lcd.setCursor(i,1);
          }
          tone(52,2000);
          delay(100);
          noTone(52);
    }

  
  //When A is pressed displays the most recently cleared number
    if (customKey=='A'){
        for (int i = 0; i <= 16; i++) {
        blinking=false;
          lcd.setCursor(i,0);
          }
          Serial.println(memory);
          lcd.setCursor(13,1);
          lcd.print(memory);
          lcd.setCursor(18,0);
          delay(3000);
          lcd.setCursor(13,1);
          lcd.print("          ");
          
      }
  
  //When # is pressed the count resets
    if (customKey=='#'){
      memory = count;  //stores the cleared value
      count=0;
      Serial.println("reset");
      Serial.println(count);
      lcd.setCursor(6,1);
      lcd.print("     ");
      partLoc();
      lcd.print(count);
    for (int i = 0; i <= 16; i++) {
      blinking=false;
        lcd.setCursor(i,1);
        }
         tone(52,1200);
          delay(100);
          noTone(52);
  }
    if (customKey=='*'){
      memory = count;  //stores the cleared value
      fabLoc;
      lcd.print("     ");
      fabLoc();
      blinking = true;
}
}
2

Where you see a digit coming off the keypad, you must add it to the previous digits, if any. I can't elaborate just now, but I did find an example snippet which I ask you to consider:

    // key is '0'..'9' - add it to result
      temp= temp*10 + (key-'0'); // maybe check it temp is not too high ...

The new number is ten times the old number, plus the newly arrived digit.

key - '0'

subtracts the ASCII character code for zero from the arrived character turning it into a number 0 to 9. Common practice. Fortunately the wizards chose to have the ASCII codes for 0 to 9 be in order no gaps, so the "trick" works.

temp must be zero to start with, and reset before gathering another multi-digit number.

Then when the number entry is finished (indicate by pressing some other key), use the value in temp to replace the operating number to the LCD elsewhere.

It's already so hot I caveat all this, hard to think straight see if you can make sense of it.

a7

3

Do you have a link that could help me better understand this. Thanks

4

Entering multiple digits on keypad, arduino.

5

Google is def your friend here. I found this offa that google link

which looks like it goes into a bit of detail. Read the whole thread, srsly, I think the light bulb will go on.

a7