/*
 * 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
 */
#include <LiquidCrystal.h>
#include <Keypad.h>
#include <Stepper.h>

const int ROW_NUM = 4; //four rows
const int COLUMN_NUM = 4; //four columns
const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
// for your motor

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

byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad
Stepper myStepper(stepsPerRevolution, 23, 25, 27, 29);
LiquidCrystal lcd(31, 33, 35, 37, 39, 41);

Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );

String inputString;
long inputInt;

void setup() {
  myStepper.setSpeed(60);  // set the speed at 60 rpm:
  inputString.reserve(10); // maximum number of digit for a number is 10, change if needed
  lcd.begin(16, 2);        // Set up the LCD's number of columns and rows:
}

void loop() {
  char key = keypad.getKey();           //Get key from Keypad

  if (key) {
    if (key >= '0' && key <= '9') {     // only act on numeric keys
      inputString += key;               // append new character to input string
    } else if (key == '#') {            // Begin when touchin # Key
      if (inputString.length() > 0) {
        inputInt = inputString.toInt(); // YOU GOT AN INTEGER NUMBER
        if (inputInt > 200){
           myStepper.step(inputInt);   // Turn back at 0 steps
           inputString = "";             // Clear input
           inputInt = 0;                 // Clear input
           lcd.clear();                  // Clear LCD
        }
        inputString = "";               // clear input
        float angle = inputInt*1.8;     // Variable Angle per step
        lcd.print(angle);               // Print To LCD
        lcd.print("Grados");            // Print To LCD
        myStepper.step(-inputInt-2);    // Steps To Make
      }
    } else if (key == '*') {
      myStepper.step(inputInt);   // Turn back at 0 steps
      inputString = "";             // Clear input
      inputInt = 0;                 // Clear input
      lcd.clear();                  // Clear LCD
    }
  }
}