#include <Wire.h>
#include <Keypad.h>
#include <Stepper.h>
#include <LiquidCrystal_I2C.h>

//LCD:
LiquidCrystal_I2C lcd(0x27, 16, 2);

//KEYPAD:
const byte ROWS = 4;
const byte COLS = 4;

byte rowPins[ROWS] = {28, 30, 32, 34};
byte colPins[COLS] = {42, 44, 46, 48};

char keys[ROWS][COLS] = {
  {'1', '2', '3', 'U'},
  {'4', '5', '6', 'L'},
  {'7', '8', '9', 'R'},
  {'T', '0', 'S', 'D'}
};

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

//STEPPER MOTOR:
const int stepsPerRevolution = 800;
Stepper myStepper(stepsPerRevolution, 8, 9);

void setup() { 
myStepper.setSpeed(10);
}
void loop() {
  char key = keypad.getKey();
    if (key != NO_KEY) {
      if (key == 'L'){
      for (int x = 0; stepsPerRevolution <= 800; x++ ){
      myStepper.step(stepsPerRevolution);
   }
  }
      else if (key == 'R'){
      for (int x = 0; stepsPerRevolution >= 800; x-- ){
      myStepper.step(-stepsPerRevolution);
   }      
  }
 }
}