#include <Keypad.h>
#include <Stepper.h>
int stepsPerRevolution = 200;

// initialize the steper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 10, 11, 12, 13);

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 }; 
uint8_t rowPins [ROWS] = {9, 8, 7, 6 }; 

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

void setup() {
  // put your setup code here, to run once:
myStepper.setSpeed(10);
Serial.begin(9600);
}

String result = "";
int langkah_step;
int A=0;
void loop() {
char key = keypad.getKey();
if (key >= '0' && key <= '9') {
 result += key;
 Serial.println(key);
 }
if (key == '#') {
  langkah_step= result.toInt();
  stepsPerRevolution=langkah_step;
  result="";
  A=1;
 }
if (key == '*') {
  langkah_step= result.toInt();
  stepsPerRevolution=langkah_step;
  result="";
  A=2;
}
if (A==1){
  Serial.print(langkah_step);
  Serial.println(": clockwise");
  myStepper.step(stepsPerRevolution);
  delay(500);
  A=0;
  langkah_step=0;
}
if (A==2){
  Serial.print(langkah_step);
  Serial.println(": counterclockwise");
  myStepper.step(-stepsPerRevolution);
  delay(500);
  A=0;
  langkah_step=0;
}
}