#include <Keypad.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

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

#include <Stepper.h>
int stepCount = 0;  // number of steps the motor has taken
const int pinDir=10;
const int pinStep=11;
 int stepsPerRevolution=12800;
 
 int Zadanikut;
 int kut;
 int brojRupa;
 float busenje;
 String msgA="A:Odaberi kut";
 String msgB="B:Odaberi broj rupa";
 String msg1="Kut je =";
 String msg2="Broj rupa=";
 String msg3="Potvrdi sa #";
 
 
 Stepper myStepper = Stepper(stepsPerRevolution,pinStep,pinDir);

 #include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);


/*
 * Created by ArduinoGetStarted.com
 *
 * This example code is in the public domain
 *
 * Tutorial page: https://arduinogetstarted.com/faq/how-to-input-a-multiple-digits-number-using-the-keypad
 */



String inputString;
int inputInt;



void setup() {
  Serial.begin(9600);
  inputString.reserve(10); // maximum number of digit for a number is 10, change if needed
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print(msgA);
  lcd.setCursor(0,1);
  lcd.print(msgB);
   

}
void loop(){
 // read the sensor value:
        int sensorReading = analogRead(A0);
  // map it to a range from 0 to 100:
  int motorSpeed = map(sensorReading, 0, 1023, 0,100);
 char key = keypad.getKey();
 
Serial.println(inputInt);
if (key >= '0' && key <= '9') {
      
        lcd.print(key);  // only act on numeric keys
      inputString += key; // append new character to input string
}
     else if (key == '#')
     rio: 
      if (inputString.length() > 0) {
        inputInt = inputString.toInt(); // YOU GOT AN INTEGER NUMBER
        inputString = "";

  lcd.setCursor(3,2);
  lcd.print("            ");

  Zadanikut=inputInt;
        kut=(12800./360.)*Zadanikut;

           brojRupa=inputInt;
        busenje=12800./brojRupa;
      } 
 
        
 
delay(10);

 if (key=='A'){
  lcd.clear();
  lcd.setCursor(9,0);
  lcd.print(inputInt);
  lcd.setCursor(3,3);
  lcd.print("Pokreni sa A");
  lcd.setCursor(3,2);
  lcd.print(msg3);
  lcd.setCursor(1,0);
  lcd.print(msg1);

 }
  
     
      if (key=='A'){ 
  
  // set the motor speed:
   myStepper.setSpeed(motorSpeed);        
 myStepper.step(kut);
 kut=-kut; 
 delay(10);

 
     
    }
    
     
 if (key == 'B'){ 
        lcd.clear();
  lcd.setCursor(3,3);
  lcd.print("Pokreni sa B");
  lcd.setCursor(3,2);
  lcd.print(msg3);
  lcd.setCursor(1,0);
  lcd.print(msg2);
  inputInt = 0;
 }
   edi:
     if (key=='B'){ 
       myStepper.setSpeed(motorSpeed);            
 myStepper.step(busenje); 
 delay(10);
 key=0;
 goto edi;
     }
    
   else if (key == 'C') {
    
     
      lcd.clear();
      inputInt = 0;// clear input
key=0;
       lcd.setCursor(0,0);
  lcd.print(msgA);
  lcd.setCursor(0,1);
  lcd.print(msgB);
  inputString = 0.;
 goto rio;
 }
 
}