New to Arduino! Would like to stop at a count using keypad for input number. Counting & Keypad work but am lost how to use the keypad for input

Using Arduino Project Guidance
1 
#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lcd(0x27, 20, 4); // I2C address 0x27, 20 column and 4 rows
#define pulsesensor 3

const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};

byte rowPins[ROWS] = { A9, A8, A7, A6 };
byte colPins[COLS] = { A5, A4, A3, A2 };
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

volatile int turns = 0;
int pulse = 0;
int cursorColumn = 10;

void setup() {
  pinMode(pulsesensor, INPUT);
attachInterrupt(digitalPinToInterrupt(3), calculatepulse, HIGH);
  lcd.init(); // initialize the lcd
  lcd.backlight();
}



void loop(){
 
lcd.setCursor(7, 0);
lcd.print ("16C #8");
lcd.setCursor(0, 2);            
lcd.print("ACTUAL COUNT="); 
lcd.print(turns);
lcd.setCursor(18, 2); 
lcd.print ("FT");
 lcd.setCursor(0, 3);
 lcd.print ("STOP AT=");
 lcd.setCursor(18, 3); 
 lcd.print ("FT");
   char key = keypad.getKey();

  if (key) {
    lcd.setCursor(cursorColumn, 3);// print key at (cursorColumn, 3)
    lcd.print(key);                 
cursorColumn++;                  // move cursor to next position
if(cursorColumn == 16) {        // if reaching limit, clear LCD
      lcd.clear();
      cursorColumn = 10;        // reset cursor position
      }                 
  }
}   
  
  
void calculatepulse(){  
  if (pulse < 80)
    pulse = pulse + 1;

  if (pulse == 80)
    turns = turns + 1;

  if (pulse >= 80)
    pulse  = 0;

    }
2

Welcome to the forum

See Keypad data entry. A beginners guide

3

Thank You! I am currently reading your breakdowns of the keypad use and is very helpful

4

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