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

LiquidCrystal_I2C lcd(0x27, 20, 4);
Servo myservo;

int potpin = A1;
int nilaiADC;
int deg = 0;
int i = 0;
int cursor=0;
const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {3, 2, 1, 0};
byte colPins[COLS] = {7, 6, 5, 4};
byte x = 1;

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


void setup() {
  // put your setup code here, to run once:
  lcd.init();

  Serial.begin(9600);
  pinMode(potpin, INPUT);
  myservo.attach(11);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  char key = keypad.getKey();
  if (key != NO_KEY)
  {
    lcd.setCursor(0,0);
    deg = (deg * 10) + (key - 48);
    i++;
      if (i >= 3) {
        myservo.write(deg);
        deg = 0; i = 0;
      }
        
    if (key != 'A')
    if (key != 'B')
    //if (key != 'C')
    //if (key != 'D')
    if (key != '*')
    if (key != '#')
    
      cursor++;
      lcd.setCursor(cursor,0);
      if(cursor==3) cursor=0;
      lcd.print(key);
  }
  
  if (key == 'C') 
  {
    lcd.setCursor(0,0);
    lcd.clear();
    //myservo.write(deg);
  }
    if (key == 'D') 
  {
    lcd.setCursor(0,0);
    lcd.clear();
    myservo.write(deg);
    lcd.setCursor(0,1);
    lcd.print("Sudut = ");lcd.print(deg);
  }
 
  nilaiADC = analogRead(potpin);
  //Serial.print("Nilai ADC = "); Serial.print(nilaiADC);
  lcd.setCursor(0,2);
  lcd.print("Nilai ADC = ");lcd.print(nilaiADC);
  
  deg = map(nilaiADC, 0, 1023, 0, 180);
  //Serial.print(", Sudut = "); Serial.println(deg);
  myservo.write(deg);
  lcd.setCursor(0,3);
  lcd.print("Sudut = ");lcd.print(deg);

  //delay(50);
  //lcd.clear();

}