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

LiquidCrystal_I2C lcd(0x27, 16, 2);
const uint8_t ROWS = 4;
const uint8_t COLS = 4;
int temp = 0;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

byte ZERO[] = {
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
};
byte ONE[] = {
  B10000,
  B10000,
  B10000,
  B10000,
  B10000,
  B10000,
  B10000,
  B10000
};
byte TWO[] = {
  B11000,
  B11000,
  B11000,
  B11000,
  B11000,
  B11000,
  B11000,
  B11000,
};
byte THREE[] = {
  B11100,
  B11100,
  B11100,
  B11100,
  B11100,
  B11100,
  B11100,
  B11100,
};
byte FOUR[] = {
  B11110,
  B11110,
  B11110,
  B11110,
  B11110,
  B11110,
  B11110,
  B11110,
};
byte FIVE[] = {
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111
};

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; 
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; 

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

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.createChar(0, ZERO);
  lcd.createChar(1, ONE);
  lcd.createChar(2, TWO);
  lcd.createChar(3, THREE);
  lcd.createChar(4, FOUR);
  lcd.createChar(5, FIVE);
}

void loop() {
  int val = analogRead(A0);
  int printVal = map(val, 0, 1023, 0, 80); // Map analog value to 0-80 range
  
  
  int A= printVal / 5;  
  int B= printVal % 5; 
  lcd.setCursor(0, 0); 
  for (int i = 0; i < A; i++) {
    lcd.write(5); 
  }
  if (A < 16) {
    lcd.write(B); 
    for (int i = A + 1; i < 16; i++) {
      lcd.write(0); 
  }

  // Display the key press if any
  char key = keypad.getKey();
  if (key != NO_KEY) {
    Serial.println(key);
    lcd.setCursor(1, 1); // Move to second row for key display
    lcd.write(key);
  }
  analogWrite(3,printVal);
}
}