#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h> 
#include <Servo.h>
LiquidCrystal_I2C lcd(0x27,16,2);
#define pwm 3
void display(char key);
const char number_of_rows = 4;
const char number_of_columns = 4;

char row_pins[number_of_rows] = {4,5,6,7};
char column_pins[number_of_columns] = {8,9,10,11};

char key_array[number_of_rows][number_of_columns] = {  
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
  };
Servo servo;
Keypad key = Keypad(makeKeymap(key_array),row_pins , column_pins, number_of_rows, number_of_columns);
int i=0,a=0,b=1;
void setup()
{
  Serial.begin(9600);
  lcd.init();                     
  lcd.backlight();
  servo.attach(pwm);
  servo.write(0);
}

void loop()
{
   lcd.setCursor(0,0);
  lcd.print("angle:");
  char key_pressed = key.getKey();
  display(key_pressed);
  if(key_pressed=='#')
  {
    delay(250);
    lcd.clear();
  }
}
void display(char key)
{
  if(key)
  {
    Serial.println(key);
    if(key=='#')
    {
      servo.write(a);
      //a=0;
    }
  lcd.setCursor(0,0);
 lcd.print("angle:");

    lcd.setCursor(i,8);
    lcd.print(key);
    if(key!='#')
    {
      i=i+1;
    }
   if(key=='#')
    {
      i=0;
    } 
    a=a*b+(key-48);
    b=10;
    Serial.println(a);
   // a=0;
   if(a>180)
   {
    a=0;
   }
  }
  
}